1
|
Gao G, Guo X, Feng Q, Xu E, Hao Y, Wang R, Jing W, Ren X, Liu S, Shi J, Wu B, Wang Y, Wen Y. Environmental Controls on Evapotranspiration and Its Components in a Qinghai Spruce Forest in the Qilian Mountains. PLANTS (BASEL, SWITZERLAND) 2024; 13:801. [PMID: 38592818 PMCID: PMC10974258 DOI: 10.3390/plants13060801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 02/23/2024] [Accepted: 03/04/2024] [Indexed: 04/11/2024]
Abstract
Qinghai spruce forests, found in the Qilian mountains, are a typical type of water conservation forest and play an important role in regulating the regional water balance and quantifying the changes and controlling factors for evapotranspiration (ET) and its components, namely, transpiration (T), evaporation (Es) and canopy interceptions (Ei), of the Qinghai spruce, which may provide rich information for improving water resource management. In this study, we partitioned ET based on the assumption that total ET equals the sum of T, Es and Ei, and then we analyzed the environmental controls on ET, T and Es. The results show that, during the main growing seasons of the Qinghai spruce (from May to September) in the Qilian mountains, the total ET values were 353.7 and 325.1 mm in 2019 and 2020, respectively. The monthly dynamics in the daily variations in T/ET and Es/ET showed that T/ET increased until July and gradually decreased afterwards, while Es/ET showed opposite trends and was mainly controlled by the amount of precipitation. Among all the ET components, T always occupied the largest part, while the contribution of Es to ET was minimal. Meanwhile, Ei must be considered when partitioning ET, as it accounts for a certain percentage (greater than one-third) of the total ET values. Combining Pearson's correlation analysis and the boosted regression trees method, we concluded that net radiation (Rn), soil temperature (Ts) and soil water content (SWC) were the main controlling factors for ET. T was mainly determined by the radiation and soil hydrothermic factors (Rn, photosynthetic active radiation (PAR) and TS30), while Es was mostly controlled by the vapor pressure deficit (VPD), atmospheric precipitation (Pa), throughfall (Pt) and air temperature (Ta). Our study may provide further theoretical support to improve our understanding of the responses of ET and its components to surrounding environments.
Collapse
Affiliation(s)
- Guanlong Gao
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China; (G.G.); (X.G.); (Y.H.); (J.S.); (B.W.); (Y.W.); (Y.W.)
- Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province, Zhangye 734000, China; (R.W.); (W.J.); (X.R.)
- Shanxi Laboratory for Yellow River, Taiyuan 030006, China
| | - Xiaoyun Guo
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China; (G.G.); (X.G.); (Y.H.); (J.S.); (B.W.); (Y.W.); (Y.W.)
- Shanxi Laboratory for Yellow River, Taiyuan 030006, China
| | - Qi Feng
- Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Erwen Xu
- Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province, Zhangye 734000, China; (R.W.); (W.J.); (X.R.)
| | - Yulian Hao
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China; (G.G.); (X.G.); (Y.H.); (J.S.); (B.W.); (Y.W.); (Y.W.)
- Shanxi Laboratory for Yellow River, Taiyuan 030006, China
| | - Rongxin Wang
- Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province, Zhangye 734000, China; (R.W.); (W.J.); (X.R.)
- Gansu Qilian Mountain Forest Eco-System of the State Research Station, Zhangye 734000, China
| | - Wenmao Jing
- Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province, Zhangye 734000, China; (R.W.); (W.J.); (X.R.)
- Gansu Qilian Mountain Forest Eco-System of the State Research Station, Zhangye 734000, China
| | - Xiaofeng Ren
- Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province, Zhangye 734000, China; (R.W.); (W.J.); (X.R.)
- Gansu Qilian Mountain Forest Eco-System of the State Research Station, Zhangye 734000, China
| | - Simin Liu
- China National Forestry-Grassland Development Research Center, Beijing 100714, China;
| | - Junxi Shi
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China; (G.G.); (X.G.); (Y.H.); (J.S.); (B.W.); (Y.W.); (Y.W.)
- Shanxi Laboratory for Yellow River, Taiyuan 030006, China
| | - Bo Wu
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China; (G.G.); (X.G.); (Y.H.); (J.S.); (B.W.); (Y.W.); (Y.W.)
- Shanxi Laboratory for Yellow River, Taiyuan 030006, China
| | - Yin Wang
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China; (G.G.); (X.G.); (Y.H.); (J.S.); (B.W.); (Y.W.); (Y.W.)
- Shanxi Laboratory for Yellow River, Taiyuan 030006, China
| | - Yujing Wen
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China; (G.G.); (X.G.); (Y.H.); (J.S.); (B.W.); (Y.W.); (Y.W.)
- Shanxi Laboratory for Yellow River, Taiyuan 030006, China
| |
Collapse
|
2
|
Iida S, Noguchi S, Levia DF, Araki M, Nitta K, Wada S, Narita Y, Tamura H, Abe T, Kaneko T. Effects of forest thinning on sap flow dynamics and transpiration in a Japanese cedar forest. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169060. [PMID: 38061642 DOI: 10.1016/j.scitotenv.2023.169060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 11/29/2023] [Accepted: 11/30/2023] [Indexed: 12/23/2023]
Abstract
Historically, forest thinning in Japan was conducted to obtain high-quality timber from plantations. Today, in contrast, thinning is also motivated by forest water balance and climate change considerations. It is in this context that the present study examines the effects of thinning on the ecophysiological responses of remaining trees, which are inadequately understood, especially in relation to changes in the magnitude and duration of transpiration. Sap flux densities were measured in both outer and inner sapwood to obtain stand-scale transpiration for two years in the pre-thinning state and three years post-thinning. The effects of thinning on transpiration were quantitatively evaluated based on canopy conductance models. The larger increases in outer sap flux density were found in the first year after the treatment, while those in inner sap flux density were detected in the second and third years. The remaining trees required a few of years to adjust to improved light conditions of the lower crown, resulting in a delayed response of inner sap flux density. As a result of this lag, transpiration was reduced to 71 % of the pre-thinning condition in the first year, but transpiration recovered to the pre-thinning levels in the second and third years due to compensating contributions from inner sap flow. In terms of more accurately chronicling the thinning effect, the distribution of sap flux density with respect to its radial pattern, is necessary. Such measurements are key to more comprehensively examining the ecophysiological response of forest plantations to thinning and, ultimately, its effect on the forest water balance.
Collapse
Affiliation(s)
- Shin'ichi Iida
- Department of Disaster Prevention, Meteorology and Hydrology, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan.
| | - Shoji Noguchi
- Japan International Research Center for Agricultural Sciences, 1-1 Ohwashi, Tsukuba, Ibaraki 305-8686, Japan
| | - Delphis F Levia
- Department of Geography & Spatial Sciences, University of Delaware, Newark, DE 19716, USA; Department of Plant & Soil Sciences, University of Delaware, Newark, DE 19716, USA; Department of Civil & Environmental Engineering, University of Delaware, Newark, DE 19716, USA
| | - Makoto Araki
- Department of Disaster Prevention, Meteorology and Hydrology, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan
| | - Kyohei Nitta
- Akita Forestry Research and Training Center, 47-2 Idojiridai Kawabetoshima, Akita, Akita 019-2611, Japan
| | - Satoru Wada
- Akita Forestry Research and Training Center, 47-2 Idojiridai Kawabetoshima, Akita, Akita 019-2611, Japan
| | - Yoshito Narita
- Forestry Environment Preservation Division, Akita Prefectural Government, 4-1-1 Sannou, Akita, Akita 010-8570, Japan
| | - Hiroki Tamura
- Akita Forestry Research and Training Center, 47-2 Idojiridai Kawabetoshima, Akita, Akita 019-2611, Japan
| | - Toshio Abe
- Tohoku Research Center, Forestry and Forest Products Research Institute, 92-25 Nabeyashiki, Shimokuriyagawa, Morioka, Iwate 020-0123, Japan
| | - Tomonori Kaneko
- Akita Forestry Research and Training Center, 47-2 Idojiridai Kawabetoshima, Akita, Akita 019-2611, Japan; Akita Prefecture Forestry Labor Countermeasures Fund, 8-28 Kawamotoyamashita, Akita, Akita 010-0931, Japan
| |
Collapse
|
3
|
Wright CL, West JB, de Lima ALA, Souza ES, Medeiros M, Wilcox BP. Contrasting water-use strategies revealed by species-specific transpiration dynamics in the Caatinga dry forest. TREE PHYSIOLOGY 2024; 44:tpad137. [PMID: 37935389 DOI: 10.1093/treephys/tpad137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 11/01/2023] [Indexed: 11/09/2023]
Abstract
In forest ecosystems, transpiration (T) patterns are important for quantifying water and carbon fluxes and are major factors in predicting ecosystem change. Seasonal changes in rainfall and soil water content can alter the sensitivity of sap flux density to daily variations in vapor pressure deficit (VPD). This sensitivity is species-specific and is thought to be related to hydraulic strategies. The aim of this work is to better understand how the sap flux density of species with low versus high wood density differ in their sensitivity to VPD and soil water content and how potentially opposing water-use strategies influence T dynamics, and ultimately, correlations to evapotranspiration (ET). We use hysteresis area analysis to quantify the sensitivity of species-specific sap flux density to changes in the VPD, breakpoint-based models to determine the soil water content threshold instigating a T response and multiscalar wavelet coherency to correlate T to ET. We found that low wood density Commiphora leptophloeos (Mart.) Gillett had a more dynamic T pattern, a greater sensitivity to VPD at high soil water content, required a higher soil water content threshold for this sensitivity to be apparent, and had a significant coherency correlation with ET at daily to monthly timescales. This behavior is consistent with a drought avoidance strategy. High wood density Cenostigma pyramidale (Tul.) E. Gagnon & G. P. Lewis, conversely, had a more stable T pattern, responded to VPD across a range of soil water content, tolerated a lower soil water content threshold to T, and had a significant coherency correlation with ET at weekly timescales. This behavior is consistent with a drought-tolerant strategy. We build on previous research to show that these species have contrasting water-use strategies that should be considered in large-scale modeling efforts.
Collapse
Affiliation(s)
- Cynthia L Wright
- Southern Research Station, USDA Forest Service, 4700 Old Kingston Pike, Knoxville, TN 37919, USA
- Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Panama City, Panama
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN 37830, USA
- Ecology and Conservation Biology, Texas A&M University, 534 John Kimbrough Blvd, College Station, TX 77843, USA
| | - Jason B West
- Ecology and Conservation Biology, Texas A&M University, 534 John Kimbrough Blvd, College Station, TX 77843, USA
| | - André L A de Lima
- Universidade Federal Rural de Pernambuco, Unidade Acadêmica de Serra Talhada, Av. Gregório Ferraz Nogueira, S/n, Bairro: José Tomé de Souza Ramos, Caixa Postal 063, CEP: 56.909-535, Serra Talhada, Pernambuco, Brazil
| | - Eduardo S Souza
- Universidade Federal Rural de Pernambuco, Unidade Acadêmica de Serra Talhada, Av. Gregório Ferraz Nogueira, S/n, Bairro: José Tomé de Souza Ramos, Caixa Postal 063, CEP: 56.909-535, Serra Talhada, Pernambuco, Brazil
| | - Maria Medeiros
- Universidade Federal Rural de Pernambuco, Unidade Acadêmica de Serra Talhada, Av. Gregório Ferraz Nogueira, S/n, Bairro: José Tomé de Souza Ramos, Caixa Postal 063, CEP: 56.909-535, Serra Talhada, Pernambuco, Brazil
- Federal University of Pernambuco, Department of Botany, Avenida Professor Moraes Rego, s/n, Cidade Universitária, CEP: 50670-901, Recife, Pernambuco, Brazil
| | - Bradford P Wilcox
- Ecology and Conservation Biology, Texas A&M University, 534 John Kimbrough Blvd, College Station, TX 77843, USA
| |
Collapse
|
4
|
Wu S, Gu X, Zheng Y, Chen L. Nocturnal sap flow as compensation for water deficits: an implicit water-saving strategy used by mangroves in stressful environments. FRONTIERS IN PLANT SCIENCE 2023; 14:1118970. [PMID: 37223786 PMCID: PMC10200988 DOI: 10.3389/fpls.2023.1118970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 04/11/2023] [Indexed: 05/25/2023]
Abstract
As part of the plant water-use process, plant nocturnal sap flow (Q n) has been demonstrated to have important ecophysiological significance to compensate for water loss. The purpose of this study was to explore nocturnal water-use strategies to fill the knowledge gap in mangroves, by measuring three species co-occurring in a subtropical estuary. Sap flow was monitored over an entire year using thermal diffusive probes. Stem diameter and leaf-level gas exchange were measured in summer. The data were used to explore the different nocturnal water balance maintaining mechanisms among species. The Q n existed persistently and contributed markedly over 5.5%~24.0% of the daily sap flow (Q) across species, which was associated with two processes, nocturnal transpiration (E n) and nocturnal stem water refilling (R n). We found that the stem recharge of the Kandelia obovata and Aegiceras corniculatum occurred mainly after sunset and that the high salinity environment drove higher Q n while stem recharge of the Avicennia marina mainly occurred in the daytime and the high salinity environment inhibited the Q n. The diversity of stem recharge patterns and response to sap flow to high salinity conditions were the main reasons for the differences in Q n/Q among species. For Kandelia obovata and Aegiceras corniculatum, R n was the main contributor to Q n, which was driven by the demands of stem water refilling after diurnal water depletion and high salt environment. Both of the species have a strict control over the stomata to reduce water loss at night. In contrast, Avicennia marina maintained a low Q n, driven by vapor pressure deficit, and the Q n mainly used for E n, which adapts to high salinity conditions by limiting water dissipation at night. We conclude that the diverse ways Q n properties act as water-compensating strategies among the co-occurring mangrove species might help the trees to overcoming water scarcity.
Collapse
|
5
|
Rice AM, Garrison-Johnston MT, Libenson AJ, Yanai RD. Tree variability limits the detection of nutrient treatment effects on sap flux density in a northern hardwood forest. PeerJ 2022; 10:e14410. [PMID: 36530407 PMCID: PMC9753739 DOI: 10.7717/peerj.14410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 10/27/2022] [Indexed: 12/14/2022] Open
Abstract
The influence of nutrient availability on transpiration is not well understood, in spite of the importance of transpiration to forest water budgets. Soil nutrients have the potential to affect tree water use through indirect effects on leaf area or stomatal conductance. For example, following addition of calcium silicate to a watershed at Hubbard Brook, in New Hampshire, streamflow was reduced for 3 years, which was attributed to a 25% increase in evapotranspiration associated with increased foliar production. The first objective of this study was to quantify the effect of nutrient availability on sap flux density in a nitrogen, phosphorus, and calcium addition experiment in New Hampshire in which tree diameter growth, foliar chemistry, and soil nutrient availability had responded to treatments. We measured sap flux density in American beech (Fagus grandifolia, Ehr.), red maple (Acer rubrum L.), sugar maple (Acer saccharum Marsh.), white birch (Betula papyrifera Marsh.), or yellow birch (Betula alleghaniensis Britton.) trees, over five years of experiments in five stands distributed across three sites. In 2018, 3 years after a calcium silicate addition, sap flux density averaged 36% higher in trees in the treatment than the control plot, but this effect was not very significant (p = 0.07). Our second objective was to determine whether this failure to detect effects with greater statistical confidence was due to small effect sizes or high variability among trees. We found that tree-to-tree variability was high, with coefficients of variation averaging 39% within treatment plots. Depending on the species and year of the study, the minimum difference in sap flux density detectable with our observed variability ranged from 46% to 352%, for a simple ANOVA. We analyzed other studies reported in the literature that compared tree water use among species or treatments and found detectable differences ranging from 16% to 78%. Future sap flux density studies could benefit from power analyses to guide sampling intensity. Including pretreatment data, in the case of manipulative studies, would also increase statistical power.
Collapse
Affiliation(s)
- Alexandrea M. Rice
- Sustainable Resources Management, SUNY College of Environmental Science and Forestry, Syracuse, NY, United States of America,Geosciences, University of Massachusetts at Amherst, Amherst, MA, United States of America
| | - Mariann T. Garrison-Johnston
- Ranger School, State University of New York College of Environmental Science and Forestry, Wanakena, NY, United States of America
| | - Arianna J. Libenson
- College of Arts and Sciences, University of Vermont, Burlington, VT, United States of America
| | - Ruth D. Yanai
- Sustainable Resources Management, SUNY College of Environmental Science and Forestry, Syracuse, NY, United States of America
| |
Collapse
|
6
|
Ruzol R, Staudhammer CL, Younger S, Aubrey DP, Loescher HW, Jackson CR, Starr G. Water use in a young
Pinus taeda
bioenergy plantation: Effect of intensive management on stand evapotranspiration. Ecosphere 2022. [DOI: 10.1002/ecs2.4100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Roel Ruzol
- Department of Biological Sciences University of Alabama Tuscaloosa Alabama USA
| | | | - Seth Younger
- Savannah River Ecology Lab University of Georgia Aiken South Carolina USA
| | - Doug P. Aubrey
- Savannah River Ecology Lab University of Georgia Aiken South Carolina USA
| | - Henry W. Loescher
- Battelle Environment and Infrastructure Boulder Colorado USA
- Institute of Alpine and Arctic Research (INSTAAR) University of Colorado Boulder Colorado USA
| | - C. Rhett Jackson
- Warnell School of Forestry and Natural Resources University of Georgia Athens Georgia USA
| | - Gregory Starr
- Department of Biological Sciences University of Alabama Tuscaloosa Alabama USA
| |
Collapse
|
7
|
Spanner GC, Gimenez BO, Wright CL, Menezes VS, Newman BD, Collins AD, Jardine KJ, Negrón-Juárez RI, Lima AJN, Rodrigues JR, Chambers JQ, Higuchi N, Warren JM. Dry Season Transpiration and Soil Water Dynamics in the Central Amazon. FRONTIERS IN PLANT SCIENCE 2022; 13:825097. [PMID: 35401584 PMCID: PMC8987125 DOI: 10.3389/fpls.2022.825097] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 02/07/2022] [Indexed: 06/14/2023]
Abstract
With current observations and future projections of more intense and frequent droughts in the tropics, understanding the impact that extensive dry periods may have on tree and ecosystem-level transpiration and concurrent carbon uptake has become increasingly important. Here, we investigate paired soil and tree water extraction dynamics in an old-growth upland forest in central Amazonia during the 2018 dry season. Tree water use was assessed via radial patterns of sap flow in eight dominant canopy trees, each a different species with a range in diameter, height, and wood density. Paired multi-sensor soil moisture probes used to quantify volumetric water content dynamics and soil water extraction within the upper 100 cm were installed adjacent to six of those trees. To link depth-specific water extraction patterns to root distribution, fine root biomass was assessed through the soil profile to 235 cm. To scale tree water use to the plot level (stand transpiration), basal area was measured for all trees within a 5 m radius around each soil moisture probe. The sensitivity of tree transpiration to reduced precipitation varied by tree, with some increasing and some decreasing in water use during the dry period. Tree-level water use scaled with sapwood area, from 11 to 190 L per day. Stand level water use, based on multiple plots encompassing sap flow and adjacent trees, varied from ∼1.7 to 3.3 mm per day, increasing linearly with plot basal area. Soil water extraction was dependent on root biomass, which was dense at the surface (i.e., 45% in the upper 5 cm) and declined dramatically with depth. As the dry season progressed and the upper soil dried, soil water extraction shifted to deeper levels and model projections suggest that much of the water used during the month-long dry-down could be extracted from the upper 2-3 m. Results indicate variation in rates of soil water extraction across the research area and, temporally, through the soil profile. These results provide key information on whole-tree contributions to transpiration by canopy trees as water availability changes. In addition, information on simultaneous stand level dynamics of soil water extraction that can inform mechanistic models that project tropical forest response to drought.
Collapse
Affiliation(s)
| | - Bruno O. Gimenez
- National Institute of Amazonian Research (INPA), Manaus, Brazil
- Smithsonian Tropical Research Institute (STRI), Panama City, Panama
| | - Cynthia L. Wright
- Oak Ridge National Laboratory, Environmental Sciences Division and Climate Change Science Institute, Oak Ridge, TN, United States
| | | | - Brent D. Newman
- Los Alamos National Laboratory, Los Alamos, NM, United States
| | - Adam D. Collins
- Los Alamos National Laboratory, Los Alamos, NM, United States
| | - Kolby J. Jardine
- National Institute of Amazonian Research (INPA), Manaus, Brazil
- Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | | | | | | | - Jeffrey Q. Chambers
- National Institute of Amazonian Research (INPA), Manaus, Brazil
- Lawrence Berkeley National Laboratory, Berkeley, CA, United States
- Department of Geography, University of California, Berkeley, Berkeley, CA, United States
| | - Niro Higuchi
- National Institute of Amazonian Research (INPA), Manaus, Brazil
| | - Jeffrey M. Warren
- Oak Ridge National Laboratory, Environmental Sciences Division and Climate Change Science Institute, Oak Ridge, TN, United States
| |
Collapse
|
8
|
Abstract
The quantification of water flow through the stem is vital for date palm (Phoenix dactylifera L.) to promote a good water stress management. The thermal dissipation probe (TDP) method developed by Granier is widely used to evaluate transpiration of forest trees; however, there are contradictory reports regarding its reliability. Considerable errors in estimated sap flux density, which might be due to a lack ofspecies-specific calibrations. The TDP method uses a mathematical model that is based on an empirical equation to estimate sap flux density, which is claimed to be applicable to all tree species, independently of wood structure and anatomy. At the laboratory, we compared the rate of water uptake by cut stems with sap flux estimates derived from the TDP method to assess the validity of the method.Our calibration results were considerably different compared to the Granier’s original equation. Moreover, sap flux density was overestimated by 18.2±0.5% when the original calibration parameters of Granierare employed. However,using new calibration parameters improved the accuracy of sap flow measurements. Our results indicated that it is not appropriate to use a general equation for different species. Therefore, previous estimations of date palm’s water requirement through thermal dissipation probes should be revised.
Collapse
|
9
|
Deng Z, Vice HK, Gilbert ME, Adams MA, Buckley TN. A double-ratio method to measure fast, slow and reverse sap flows. TREE PHYSIOLOGY 2021; 41:2438-2453. [PMID: 34100073 DOI: 10.1093/treephys/tpab081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 05/31/2021] [Indexed: 06/12/2023]
Abstract
Sap velocity measurements are useful in fields ranging from plant water relations to hydrology at a variety of scales. Techniques based on pulses of heat are among the most common methods to measure sap velocity, but most lack ability to measure velocities across a wide range, including very high, very low and negative velocities (reverse flow). We propose a new method, the double-ratio method (DRM), which is robust across an unprecedented range of sap velocities and provides real-time estimates of the thermal diffusivity of wood. The DRM employs one temperature sensor upstream (proximal) and two sensors downstream (distal) to the source of heat. This facilitates several theoretical, heat-based approaches to quantifying sap velocity. We tested the DRM using whole-tree lysimetry in Eucalyptus cypellocarpa L.A.S. Johnson and found strong agreement across a wide range of velocities.
Collapse
Affiliation(s)
- Zijuan Deng
- Centre for Carbon, Water and Food, The University of Sydney, Brownlow Hill, NSW, 2570
- College of Science and Engineering, Flinders University, Adelaide, Australia
| | - Heather K Vice
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Matthew E Gilbert
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| | - Mark A Adams
- School of Science, Faculty of Science, Engineering & Technology, Swinburne University of Technology, Victoria 3122, Australia
| | - Thomas N Buckley
- Department of Plant Sciences, University of California, Davis, CA 95616 USA
| |
Collapse
|
10
|
Bodo AV, Arain MA. Radial variations in xylem sap flux in a temperate red pine plantation forest. ECOLOGICAL PROCESSES 2021; 10:24. [PMID: 34722105 PMCID: PMC8550132 DOI: 10.1186/s13717-021-00295-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 04/01/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Scaling sap flux measurements to whole-tree water use or stand-level transpiration is often done using measurements conducted at a single point in the sapwood of the tree and has the potential to cause significant errors. Previous studies have shown that much of this uncertainty is related to (i) measurement of sapwood area and (ii) variations in sap flow at different depths within the tree sapwood. RESULTS This study measured sap flux density at three depth intervals in the sapwood of 88-year-old red pine (Pinus resinosa) trees to more accurately estimate water-use at the tree- and stand-level in a plantation forest near Lake Erie in Southern Ontario, Canada. Results showed that most of the water transport (65%) occurred in the outermost sapwood, while only 26% and 9% of water was transported in the middle and innermost depths of sapwood, respectively. CONCLUSIONS These results suggest that failing to consider radial variations in sap flux density within trees can lead to an overestimation of transpiration by as much as 81%, which may cause large uncertainties in water budgets at the ecosystem and catchment scale. This study will help to improve our understanding of water use dynamics and reduce uncertainties in sap flow measurements in the temperate pine forest ecosystems in the Great Lakes region and help in protecting these forests in the face of climate change.
Collapse
Affiliation(s)
- Alanna V. Bodo
- School of Earth, Environment and Society, McMaster University, Hamilton, ON Canada
- McMaster Centre for Climate Change, Hamilton, ON Canada
| | - M. Altaf Arain
- School of Earth, Environment and Society, McMaster University, Hamilton, ON Canada
- McMaster Centre for Climate Change, Hamilton, ON Canada
| |
Collapse
|
11
|
Leng B, Cao KF. The sap flow of six tree species and stand water use of a mangrove forest in Hainan, China. Glob Ecol Conserv 2020. [DOI: 10.1016/j.gecco.2020.e01233] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
12
|
Zhang M, Chen S, Jiang H, Cao Q. The water transport profile of Phyllostachys edulis during the explosive growth phase of bamboo shoots. Glob Ecol Conserv 2020. [DOI: 10.1016/j.gecco.2020.e01251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
13
|
Peters RL, Pappas C, Hurley AG, Poyatos R, Flo V, Zweifel R, Goossens W, Steppe K. Assimilate, process and analyse thermal dissipation sap flow data using the TREX
r
package. Methods Ecol Evol 2020. [DOI: 10.1111/2041-210x.13524] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Richard L. Peters
- Laboratory of Plant Ecology Department of Plants and Crops Faculty of Bioscience Engineering Ghent University Ghent Belgium
- Forest Dynamics Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL) Birmensdorf Switzerland
| | - Christoforos Pappas
- Département de géographie Université de Montréal Montreal QC Canada
- Centre d’étude de la forêtUniversité du Québec à Montréal Montreal QC Canada
- Département Science et Technologie Téluq Université du Québec Montreal QC Canada
| | - Alexander G. Hurley
- GFZ German Research Centre for GeosciencesSection 4.3 Climate Dynamics and Landscape Evolution Potsdam Germany
- School of Geography, Earth and Environmental Sciences University of Birmingham Birmingham UK
| | - Rafael Poyatos
- CREAFE08193 Bellaterra (Cerdanyola del Vallès) Catalonia Spain
- Universitat Autònoma de BarcelonaE08193 Bellaterra (Cerdanyola del Vallès) Catalonia Spain
| | - Victor Flo
- School of Geography, Earth and Environmental Sciences University of Birmingham Birmingham UK
| | - Roman Zweifel
- Forest Dynamics Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL) Birmensdorf Switzerland
| | - Willem Goossens
- Laboratory of Plant Ecology Department of Plants and Crops Faculty of Bioscience Engineering Ghent University Ghent Belgium
| | - Kathy Steppe
- Laboratory of Plant Ecology Department of Plants and Crops Faculty of Bioscience Engineering Ghent University Ghent Belgium
| |
Collapse
|
14
|
Liu C, Hölttä T, Tian X, Berninger F, Mäkelä A. Weaker Light Response, Lower Stomatal Conductance and Structural Changes in Old Boreal Conifers Implied by a Bayesian Hierarchical Model. FRONTIERS IN PLANT SCIENCE 2020; 11:579319. [PMID: 33240299 PMCID: PMC7677260 DOI: 10.3389/fpls.2020.579319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 09/30/2020] [Indexed: 06/11/2023]
Abstract
Age-related effects on whole-tree hydraulics are one of the key challenges to better predicting the production and growth of old-growth forests. Previous models have described the optimal state of stomatal behaviour, and field studies have implied on age/size-induced trends in tree ecophysiology related to hydraulics. On these bases, we built a Bayesian hierarchical model to link sap flow density and drivers of transpiration directly. The model included parameters with physiological meanings and accounted for variations in leaf-sapwood area ratio and the time lag between sap flow and transpiration. The model well-simulated the daily pattern of sap flow density and the variation between tree age groups. The results of parameterization show that (1) the usually higher stomatal conductance in young than old trees during mid-summer was mainly because the sap flow of young trees were more activated at low to medium light intensity, and (2) leaf-sapwood area ratio linearly decreased while time lag linearly increased with increasing tree height. Uncertainty partitioning and cross-validation, respectively, indicated a reliable and fairly robust parameter estimation. The model performance may be further improved by higher data quality and more process-based expressions of the internal dynamics of trees.
Collapse
Affiliation(s)
- Che Liu
- Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
- Institute for Atmospheric and Earth System Research (INAR), University of Helsinki, Helsinki, Finland
| | - Teemu Hölttä
- Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
- Institute for Atmospheric and Earth System Research (INAR), University of Helsinki, Helsinki, Finland
| | - Xianglin Tian
- Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
- Institute for Atmospheric and Earth System Research (INAR), University of Helsinki, Helsinki, Finland
| | - Frank Berninger
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
| | - Annikki Mäkelä
- Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
- Institute for Atmospheric and Earth System Research (INAR), University of Helsinki, Helsinki, Finland
| |
Collapse
|
15
|
Using High-Frequency Water Vapor Isotopic Measurements as a Novel Method to Partition Daily Evapotranspiration in an Oak Woodland. WATER 2020. [DOI: 10.3390/w12112967] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Partitioning evapotranspiration (ET) into its constituent fluxes (transpiration (T) and evaporation (E)) is important for understanding water use efficiency in forests and other ecosystems. Recent advancements in cavity ringdown spectrometers (CRDS) have made collecting high-resolution water isotope data possible in remote locations, but this technology has rarely been utilized for partitioning ET in forests and other natural systems. To understand how the CRDS can be integrated with more traditional techniques, we combined stable isotope, eddy covariance, and sap flux techniques to partition ET in an oak woodland using continuous water vapor CRDS measurements and monthly soil and twig samples processed using isotope ratio mass spectrometry (IRMS). Furthermore, we wanted to compare the efficacy of δ2H versus δ18O within the stable isotope method for partitioning ET. We determined that average daytime vapor pressure deficit and soil moisture could successfully predict the relative isotopic compositions of soil (δe) and xylem (δt) water, respectively. Contrary to past studies, δ2H and δ18O performed similarly, indicating CRDS can increase the utility of δ18O in stable isotope studies. However, we found a 41–49% overestimation of the contribution of T to ET (fT) when utilizing the stable isotope technique compared to traditional techniques (reduced to 4–12% when corrected for bias), suggesting there may be a systematic bias to the Craig-Gordon Model in natural systems.
Collapse
|
16
|
Liu X, Biondi F. Transpiration drivers of high-elevation five-needle pines (Pinus longaeva and Pinus flexilis) in sky-island ecosystems of the North American Great Basin. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 739:139861. [PMID: 32544678 DOI: 10.1016/j.scitotenv.2020.139861] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 05/24/2020] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
We investigated the interaction between soil water supply and atmospheric evaporative demand for driving the seasonal pattern of transpiration in sky-island high-elevation forest ecosystems. Sap flow measurements were collected at 10-minute intervals for five consecutive years (2013-2017) on two co-occurring subalpine conifers, i.e. limber pine (Pinus flexilis) and bristlecone pine (Pinus longaeva). Our study site is part of the Nevada Climate-ecohydrological Assessment Network (NevCAN), and is located at 3355 m a.s.l. within an undisturbed mixed-conifer stand. We found that seasonal changes in soil moisture regulated transpiration sensitivity to atmospheric conditions. Sap flow density was mainly limited by evaporative demands under non-water limiting conditions, but was influenced only by soil moisture when water availability decreased. Daily sap flow density increased with radiation and soil moisture in June and July when soil moisture was generally above 10%, but correlated only with soil moisture in August and September when soil drought occurred. Sap flow sensitivity to vapor pressure deficit and solar radiation was therefore reduced under decreasing soil moisture conditions. Transpiration peaked in mid-to-late June during both dry and wet years, with a lower peak in late summer during wet years. Normalized mean daily canopy conductance of both species declined with decreasing soil moisture (i.e., increasing soil drought). Severe soil drying (i.e., soil moisture <7% at 20 cm depth), which was rarely detected in wet summers (2013-2014) but occurred more frequently in dry summers (2015-2017), induced a minimum in crown conductance with unchanged low-level sap flow, which might potentially trigger hydraulic failure. The minimum sap flow level under severe soil drought was higher for limber pine than bristlecone pine, possibly because of wider tracheids in limber compared to bristlecone pine. Our findings provide insights into physiological mechanisms of drought-induced stress for iconic sky-island five-needle pines located at high elevation in xeric environments.
Collapse
Affiliation(s)
- Xinsheng Liu
- College of Tourism and Geography, Jiujiang University, East Qianjin Road No. 551, Jiujiang 332005, China; DendroLab, Department of Natural Resources and Environmental Science, University of Nevada, Reno, NV 89557, USA
| | - Franco Biondi
- DendroLab, Department of Natural Resources and Environmental Science, University of Nevada, Reno, NV 89557, USA.
| |
Collapse
|
17
|
Harrison JL, Sanders-DeMott R, Reinmann AB, Sorensen PO, Phillips NG, Templer PH. Growing-season warming and winter soil freeze/thaw cycles increase transpiration in a northern hardwood forest. Ecology 2020; 101:e03173. [PMID: 32852804 DOI: 10.1002/ecy.3173] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 06/01/2020] [Accepted: 06/19/2020] [Indexed: 11/11/2022]
Abstract
Climate models project higher growing-season temperatures and a decline in the depth and duration of winter snowpack throughout many north temperate ecosystems over the next century. A smaller snowpack is projected to induce more frequent soil freeze/thaw cycles in winter in northern hardwood forests of the northeastern United States. We measured the combined effects of warmer growing-season soil temperatures and increased winter freeze/thaw cycles on rates of leaf-level photosynthesis and transpiration (sap flow) of red maple (Acer rubrum) trees in a northern hardwood forest at the Climate Change Across Seasons Experiment at Hubbard Brook Experimental Forest in New Hampshire. Soil temperatures were warmed 5°C above ambient temperatures during the growing season and soil freeze/thaw cycles were induced in winter to mimic the projected changes in soil temperature over the next century. Relative to reference plots, growing-season soil warming increased rates of leaf-level photosynthesis by up to 85.32 ± 4.33%, but these gains were completely offset by soil freeze/thaw cycles in winter, suggesting that increased freeze/thaw cycles in winter over the next 100 yr will reduce the effect of warming on leaf-level carbon gains. Soil warming in the growing season increased rates of transpiration per kilopascal of vapor pressure deficit (VPD) by up to 727.39 ± 0.28%, even when trees were exposed to increased frequency of soil freeze/thaw cycles in the previous winter, which could influence regional hydrology in the future. Using climate projections downscaled from the Coupled Model Intercomparison Project, we project increased rates of whole-season transpiration in these forests over the next century by 42-61%. We also project 52-77 additional days when daily air temperatures will be above the long-term average daily maximum during the growing season at Hubbard Brook. Together, these results show that projected changes in climate across both the growing season and winter are likely to cause greater rates of water uptake and have no effect on rates of leaf-level carbon uptake by trees, with potential ecosystem consequences for hydrology and carbon cycling in northern hardwood forests.
Collapse
Affiliation(s)
- Jamie L Harrison
- Department of Biology, Boston University, 5 Cummington Mall, Boston, Massachusetts, 02215, USA
| | - Rebecca Sanders-DeMott
- Department of Biology, Boston University, 5 Cummington Mall, Boston, Massachusetts, 02215, USA
| | - Andrew B Reinmann
- Department of Biology, Boston University, 5 Cummington Mall, Boston, Massachusetts, 02215, USA
| | - Patrick O Sorensen
- Department of Biology, Boston University, 5 Cummington Mall, Boston, Massachusetts, 02215, USA
| | - Nathan G Phillips
- Department of Earth and Environment, Boston University, 685 Commonwealth Avenue, Boston, Massachusetts, 02215, USA
| | - Pamela H Templer
- Department of Biology, Boston University, 5 Cummington Mall, Boston, Massachusetts, 02215, USA
| |
Collapse
|
18
|
Vernay A, Tian X, Chi J, Linder S, Mäkelä A, Oren R, Peichl M, Stangl ZR, Tor-Ngern P, Marshall JD. Estimating canopy gross primary production by combining phloem stable isotopes with canopy and mesophyll conductances. PLANT, CELL & ENVIRONMENT 2020; 43:2124-2142. [PMID: 32596814 DOI: 10.1111/pce.13835] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 06/21/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
Gross primary production (GPP) is a key component of the forest carbon cycle. However, our knowledge of GPP at the stand scale remains uncertain, because estimates derived from eddy covariance (EC) rely on semi-empirical modelling and the assumptions of the EC technique are sometimes not fully met. We propose using the sap flux/isotope method as an alternative way to estimate canopy GPP, termed GPPiso/SF , at the stand scale and at daily resolution. It is based on canopy conductance inferred from sap flux and intrinsic water-use efficiency estimated from the stable carbon isotope composition of phloem contents. The GPPiso/SF estimate was further corrected for seasonal variations in photosynthetic capacity and mesophyll conductance. We compared our estimate of GPPiso/SF to the GPP derived from PRELES, a model parameterized with EC data. The comparisons were performed in a highly instrumented, boreal Scots pine forest in northern Sweden, including a nitrogen fertilized and a reference plot. The resulting annual and daily GPPiso/SF estimates agreed well with PRELES, in the fertilized plot and the reference plot. We discuss the GPPiso/SF method as an alternative which can be widely applied without terrain restrictions, where the assumptions of EC are not met.
Collapse
Affiliation(s)
- Antoine Vernay
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Xianglin Tian
- Department of Forest Sciences, University of Helsinki, Helsinki, Finland
| | - Jinshu Chi
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Sune Linder
- Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Alnarp, Sweden
| | - Annikki Mäkelä
- Department of Forest Sciences, University of Helsinki, Helsinki, Finland
| | - Ram Oren
- Department of Forest Sciences, University of Helsinki, Helsinki, Finland
- Division of Environmental Science & Policy, Nicholas School of the Environment, Duke University, Durham, North Carolina, USA
- Department of Civil & Environmental Engineering, Pratt School of Engineering, Duke University, Durham, North Carolina, USA
| | - Matthias Peichl
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Zsofia R Stangl
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Pantana Tor-Ngern
- Department of Environmental Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
- Environment, Health and Social Data Analytics Research Group, Chulalongkorn University, Bangkok, Thailand
| | - John D Marshall
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| |
Collapse
|
19
|
Pieters O, De Swaef T, Lootens P, Stock M, Roldán-Ruiz I, wyffels F. Gloxinia-An Open-Source Sensing Platform to Monitor the Dynamic Responses of Plants. SENSORS 2020; 20:s20113055. [PMID: 32481619 PMCID: PMC7309107 DOI: 10.3390/s20113055] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 05/20/2020] [Accepted: 05/26/2020] [Indexed: 11/28/2022]
Abstract
The study of the dynamic responses of plants to short-term environmental changes is becoming increasingly important in basic plant science, phenotyping, breeding, crop management, and modelling. These short-term variations are crucial in plant adaptation to new environments and, consequently, in plant fitness and productivity. Scalable, versatile, accurate, and low-cost data-logging solutions are necessary to advance these fields and complement existing sensing platforms such as high-throughput phenotyping. However, current data logging and sensing platforms do not meet the requirements to monitor these responses. Therefore, a new modular data logging platform was designed, named Gloxinia. Different sensor boards are interconnected depending upon the needs, with the potential to scale to hundreds of sensors in a distributed sensor system. To demonstrate the architecture, two sensor boards were designed—one for single-ended measurements and one for lock-in amplifier based measurements, named Sylvatica and Planalta, respectively. To evaluate the performance of the system in small setups, a small-scale trial was conducted in a growth chamber. Expected plant dynamics were successfully captured, indicating proper operation of the system. Though a large scale trial was not performed, we expect the system to scale very well to larger setups. Additionally, the platform is open-source, enabling other users to easily build upon our work and perform application-specific optimisations.
Collapse
Affiliation(s)
- Olivier Pieters
- IDLab-AIRO—Ghent University—imec, Technologiepark-Zwijnaarde 126, 9052 Zwijnaarde, Belgium;
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Caritasstraat 39, 9090 Melle, Belgium; (T.D.S.); (P.L.); (I.R.-R.)
- Correspondence:
| | - Tom De Swaef
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Caritasstraat 39, 9090 Melle, Belgium; (T.D.S.); (P.L.); (I.R.-R.)
| | - Peter Lootens
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Caritasstraat 39, 9090 Melle, Belgium; (T.D.S.); (P.L.); (I.R.-R.)
| | - Michiel Stock
- KERMIT, Department of Data Analysis and Mathematical Modelling, Ghent University, Coupure links 653, 9000 Ghent, Belgium;
| | - Isabel Roldán-Ruiz
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Caritasstraat 39, 9090 Melle, Belgium; (T.D.S.); (P.L.); (I.R.-R.)
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ledeganckstraat 35, 9000 Gent, Belgium
| | - Francis wyffels
- IDLab-AIRO—Ghent University—imec, Technologiepark-Zwijnaarde 126, 9052 Zwijnaarde, Belgium;
| |
Collapse
|
20
|
Terada Y, Horikawa Y, Nagata A, Kose K, Fukuda K. Dynamics of xylem and phloem sap flow in an outdoor zelkova tree visualized by magnetic resonance imaging. TREE PHYSIOLOGY 2020; 40:290-304. [PMID: 31860722 DOI: 10.1093/treephys/tpz120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 07/17/2019] [Accepted: 11/14/2019] [Indexed: 06/10/2023]
Abstract
Xylem and phloem sap flows in an intact, young Japanese zelkova tree (Zelkova serrata (Thunb.) Makino) growing outdoors were measured using magnetic resonance imaging (MRI). Two propagator-based sequences were developed for q-space imaging: pulse field gradient (PFG) with spin echo (PFG-SE) and stimulated echo (PFG-STE), which were used for xylem and phloem flow measurements, respectively. The data evaluation methods were improved to image fast xylem flow and slow phloem flow. Measurements were taken every 2-3 h for several consecutive days in August 2016, and diurnal changes in xylem and phloem sap flows in a cross-section of the trunk were quantified at a resolution of 1 mm2. During the day, apparent xylem flow volume exhibited a typical diurnal pattern following a vapor pressure deficit. The velocity mapping of xylem sap flow across the trunk cross section revealed that the greatest flow volume was found in current-year earlywood that had differentiated in April-May. The combined xylem flow in the 1- and 2-year-old annual rings also contributed to one-third of total sap flow. In the phloem, downward sap flow did not exhibit diurnal changes. This novel application of MRI in visualization of xylem and phloem sap flow by MRI is a promising tool for in vivo study of water transport in mature trees.
Collapse
Affiliation(s)
- Yasuhiko Terada
- Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Yusuke Horikawa
- Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Akiyoshi Nagata
- Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Katsumi Kose
- Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Kenji Fukuda
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| |
Collapse
|
21
|
The Dynamics of Transpiration to Evapotranspiration Ratio under Wet and Dry Canopy Conditions in a Humid Boreal Forest. FORESTS 2020. [DOI: 10.3390/f11020237] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Humid boreal forests are unique environments characterized by a cold climate, abundant precipitation, and high evapotranspiration. Transpiration ( E T ), as a component of evapotranspiration (E), behaves differently under wet and dry canopy conditions, yet very few studies have focused on the dynamics of transpiration to evapotranspiration ratio ( E T / E ) under transient canopy wetness states. This study presents field measurements of E T / E at the Montmorency Forest, Québec, Canada: a balsam fir boreal forest that receives ∼ 1600 mm of precipitation annually (continental subarctic climate; Köppen classification subtype Dfc). Half-hourly observations of E and E T were obtained over two growing seasons using eddy-covariance and sap flow (Granier’s constant thermal dissipation) methods, respectively, under wet and dry canopy conditions. A series of calibration experiments were performed for sap flow, resulting in species-specific calibration coefficients that increased estimates of sap flux density by 34 % ± 8 % , compared to Granier’s original coefficients. The uncertainties associated with the scaling of sap flow measurements to stand E T , especially circumferential and spatial variations, were also quantified. From 30 wetting–drying events recorded during the measurement period in summer 2018, variations in E T / E were analyzed under different stages of canopy wetness. A combination of low evaporative demand and the presence of water on the canopy from the rainfall led to small E T / E . During two growing seasons, the average E T / E ranged from 35 % ± 2 % to 47 % ± 3 % . The change in total precipitation was not the main driver of seasonal E T / E variation, therefore it is important to analyze the impact of rainfall at half-hourly intervals.
Collapse
|
22
|
Teshera-Levye J, Miles B, Terwilliger V, Lovelock CE, Cavender-Bares J. Drivers of habitat partitioning among three Quercus species along a hydrologic gradient. TREE PHYSIOLOGY 2020; 40:142-157. [PMID: 31860720 DOI: 10.1093/treephys/tpz112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 10/08/2019] [Indexed: 06/10/2023]
Abstract
A critical process that allows multiple, similar species to coexist in an ecological community is their ability to partition local habitat gradients. The mechanisms that underlie this separation at local scales may include niche differences associated with their biogeographic history, differences in ecological function associated with the degree of shared ancestry and trait-based performance differences, which may be related to spatial or temporal variation in habitat. In this study we measured traits related to water-use, growth and stress tolerance in mature trees and seedlings of three oak species (Quercus alba L., Quercus falcata Michx. and Quercus palustris Münchh). which co-occur in temperate forests across the eastern USA but tend to be found in contrasting hydrologic environments. The three species showed significant differences in their local distributions along a hydrologic gradient. We tested three possible mechanisms that influence their contrasting local environmental distributions and promote their long-term co-existence: (i) differences in their climatic distributions across a broad geographic range, (ii) differences in functional traits related to water use, drought tolerance and growth and (iii) contrasting responses to temporal variation in water availability. We identified key differences between the species in both their range-wide climatic distributions (especially aridity index and mean annual temperature) and physiological traits in mature trees and seedlings, including daily water loss, hydraulic conductance, stress responses, growth rate and biomass allocation. Taken together, these differences explain the habitat partitioning that allows three closely related species to co-occur locally.
Collapse
Affiliation(s)
- Jennifer Teshera-Levye
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St Paul, MN 55108, USA
| | - Brianna Miles
- Smithsonian Environmental Research Center, Edgewater, MD 21037, USA
- Center for Urban Environmental Research and Education University of Maryland Baltimore County, Baltimore, MD 21250, USA
| | - Valery Terwilliger
- Smithsonian Environmental Research Center, Edgewater, MD 21037, USA
- Department of Geography and Atmospheric Science, University of Kansas, Lawrence, KS 66045, USA
| | - Catherine E Lovelock
- Smithsonian Environmental Research Center, Edgewater, MD 21037, USA
- School of Biological Science University of Queensland, St Lucia, QLD Brisbane 4072, Australia
| | - Jeannine Cavender-Bares
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St Paul, MN 55108, USA
- Smithsonian Environmental Research Center, Edgewater, MD 21037, USA
| |
Collapse
|
23
|
Casaroli D, Sérvulo ACO, Vellame LM, Alves Júnior J, Evangelista AWP, Mesquita M, Flores RA. Transpiration and growth of young African mahogany plants subject to different water regimes. INTERNATIONAL JOURNAL OF BIOMETEOROLOGY 2020; 64:1-13. [PMID: 31385091 DOI: 10.1007/s00484-019-01771-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 07/09/2019] [Accepted: 07/21/2019] [Indexed: 06/10/2023]
Abstract
Timber production has been prominent in the Brazil scenario to minimize deforestation. Thus, technical information is necessary to define the productive process of the African mahogany in the Midwest region of Brazil, especially with regard to its hydric parameters. Recent studies, reported in the literature, have shown that irrigation improves the performance of young African mahogany plants in the field. Sap flow measurement can be used to estimate transpiration of perennial plants and to determine their water demand. This study evaluated the influence of two water regimes on the transpiration and growth of an African mahogany forest after irrigation has ceased. Moreover, this study also characterizes the seasonal patterns of transpiration and growth of African mahogany under these conditions. African mahogany plants with 2.5 years of age were cultivated in Bonfinopolis-GO and evaluated for 2 years. Treatments were IT-irrigated until 2 years of age-and NIT-non-irrigated. Plant height (PH), breast height diameter (DBH), trunk volume (TRV), leaf area (LA), leaf dry matter (LDM), and transpiration (T) were monitored by heat dissipation probe (HDP) between Oct/2014 and Oct/2015. Higher growth in LA, DBH, and LDM were observed in IT. However, increase in PH and TRV was similar in both treatments. The mean annual T was similar between treatments (15.0 L m-2 month-1). The highest T was recorded in October/2014 (IT = 33.0 L m-2 month-1) and July/2015 (NIT = 20.5 L m-2 month-1). The greater LA and water deficit blades DEF > 30 mm promoted lower transpiration in the irrigated plants. Irrigation maintained plant growth in PH, DBH, and LA in the third year, even after irrigation has ceased. However, non-irrigated plants were similar in TRV (0.065 m3) and transpiration rates (≈ 15 L m-2 month-1). Winter transpiration (11.3 L m-2 month-1) was lower than in summer (18.8 L m-2 month-1) for irrigated plants and similar for non-irrigated plants (≈ 14 L m-2 month-1). Based on that, in order to maintain the homogeneity of the plants, the irrigation in the first 2 years of cultivation is recommended, and also, the sap flow measures presented satisfactory results regarding the determinations of the water needs of African mahogany.
Collapse
|
24
|
Carbon Limitation and Drought Sensitivity at Contrasting Elevation and Competition of Abies pinsapo Forests. Does Experimental Thinning Enhance Water Supply and Carbohydrates? FORESTS 2019. [DOI: 10.3390/f10121132] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Stand-level competition and local climate influence tree responses to increased drought at the regional scale. To evaluate stand density and elevation effects on tree carbon and water balances, we monitored seasonal changes in sap-flow density (SFD), gas exchange, xylem water potential, secondary growth, and non-structural carbohydrates (NSCs) in Abies pinsapo. Trees were subjected to experimental thinning within a low-elevation stand (1200 m), and carbon and water balances were compared to control plots at low and high elevation (1700 m). The hydraulic conductivity and the resistance to cavitation were also characterized, showing relatively high values and no significant differences among treatments. Trees growing at higher elevations presented the highest SFD, photosynthetic rates, and secondary growth, mainly because their growing season was extended until summer. Trees growing at low elevation reduced SFD during late spring and summer while SFD and secondary growth were significantly higher in the thinned stands. Declining NSC concentrations in needles, branches, and sapwood suggest drought-induced control of the carbon supply status. Our results might indicate potential altitudinal shifts, as better performance occurs at higher elevations, while thinning may be suitable as adaptive management to mitigate drought effects in endangered Mediterranean trees.
Collapse
|
25
|
Speckman H, Ewers BE, Beverly DP. AquaFlux: Rapid, transparent and replicable analyses of plant transpiration. Methods Ecol Evol 2019. [DOI: 10.1111/2041-210x.13309] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Heather Speckman
- Department of Botany University of Wyoming Laramie WY USA
- Program in Ecology University of Wyoming Laramie WY USA
| | - Brent E. Ewers
- Department of Botany University of Wyoming Laramie WY USA
- Program in Ecology University of Wyoming Laramie WY USA
| | - Daniel P. Beverly
- Department of Botany University of Wyoming Laramie WY USA
- Water Resources/Environmental Science & Engineering University of Wyoming Laramie WY USA
| |
Collapse
|
26
|
Pasqualotto G, Carraro V, Menardi R, Anfodillo T. Calibration of Granier-Type (TDP) Sap Flow Probes by a High Precision Electronic Potometer. SENSORS 2019; 19:s19102419. [PMID: 31137901 PMCID: PMC6566514 DOI: 10.3390/s19102419] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 05/15/2019] [Accepted: 05/24/2019] [Indexed: 01/29/2023]
Abstract
Thermal dissipation probe (TDP) method (Granier, 1985) is widely used to estimate tree transpiration (i.e., the water evaporated from the leaves) because it is simple to build, easy to install, and relatively inexpensive. However, the universality of the original calibration has been questioned and, in many cases, proved to be inaccurate. Thus, when the TDP is used in a new species, specific tests should be carried out. Our aim was to propose a new method for improving the accuracy of TDP on trees in the field. Small hazelnut trees (diameter at breast height 5 cm) were used for the experiment. The response of TDP sensors was compared with a reference water uptake measured with an electronic potometer system provided with a high precision liquid flow meter. We equipped three stems where we measured the sap flow density, the sapwood area (by using fuchsine), the total tree water uptake (reference), and the main meteorological parameters during summer 2018. Results confirmed that the original Granier’s calibration underestimated the effective tree transpiration (relative error about −60%). We proposed a new equation for improving the measurement accuracy within an error of about 4%. The system proposed appeared an easier solution compared to potted trees and particularly suitable for orchards, thus contributing to improve the irrigation management worldwide.
Collapse
Affiliation(s)
- Gaia Pasqualotto
- Dipartimento Territorio e Sistemi Agro-Forestali, Università degli studi di Padova, Viale dell'Università 16, 35020 Legnaro, Italy.
| | - Vinicio Carraro
- Dipartimento Territorio e Sistemi Agro-Forestali, Università degli studi di Padova, Viale dell'Università 16, 35020 Legnaro, Italy.
| | - Roberto Menardi
- Dipartimento Territorio e Sistemi Agro-Forestali, Università degli studi di Padova, Viale dell'Università 16, 35020 Legnaro, Italy.
| | - Tommaso Anfodillo
- Dipartimento Territorio e Sistemi Agro-Forestali, Università degli studi di Padova, Viale dell'Università 16, 35020 Legnaro, Italy.
| |
Collapse
|
27
|
Gutierrez Lopez J, Licata J, Pypker T, Asbjornsen H. Effects of heater wattage on sap flux density estimates using an improved tree-cut experiment. TREE PHYSIOLOGY 2019; 39:679-693. [PMID: 30597089 DOI: 10.1093/treephys/tpy137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 11/11/2018] [Accepted: 11/22/2018] [Indexed: 06/09/2023]
Abstract
We assessed the effects of heater wattage on sap flux estimates from heat dissipation sensors and generated calibrated equations for 1-year-old Eucalyptus grandis Hill ex Maiden trees. We used a total of eight trees ranging from 3 to 6 cm in diameter. Our calibration experiment was performed with a modified tree-cut approach, which allowed us to estimate gravimetric water use manually weighing 20 l buckets every 15 min while sap flux was monitored on each tree. Our results indicate that changes the current supplied to the heaters from 0.15 to 0.25 W does not significantly influence sap flux estimates, as long as the maximum temperature (Tmax) is properly determined for each period when wattage is different, and natural temperature gradients are corrected. Using the original parameters developed for this method, sap flux density and sap flow had an average underestimation of 53%, which according to our analysis had a reduced but relevant correlation with tree diameter (R2 = 0.3, linear regression). These results may allow researchers to supply different currents to heat dissipation sensors to increase sensitivity or to reduce power consumption. They also provide evidence in favor of the correction and use of raw data collected when unwanted changes in wattage occur. The relationship observed between estimation error and tree diameter, while not strongly significant, suggests that diameter plays an important role in the estimation errors that has not been previously considered, and requires further research.
Collapse
Affiliation(s)
- Jose Gutierrez Lopez
- Earth Systems Research Center, University of New Hampshire, Durham, NH, USA
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå Sweden
| | - Julian Licata
- Institutional Research and Effectiveness, Bemidji State University, Bemidji, MN, USA
| | - Thomas Pypker
- Department of Natural Resource Sciences, Thompson Rivers University, Kamloops, BC, Canada
| | - Heidi Asbjornsen
- Earth Systems Research Center, University of New Hampshire, Durham, NH, USA
| |
Collapse
|
28
|
Wang Y, Cao G, Wang Y, Webb AA, Yu P, Wang X. Response of the daily transpiration of a larch plantation to variation in potential evaporation, leaf area index and soil moisture. Sci Rep 2019; 9:4697. [PMID: 30886244 PMCID: PMC6423317 DOI: 10.1038/s41598-019-41186-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 01/11/2019] [Indexed: 11/11/2022] Open
Abstract
Tree transpiration (T) is a major water budget component and varies widely due to the integrated effects of many environmental and vegetation factors. This study aimed to separate, quantify, and then integrate the effects of the main individual factors, to improve water use estimation and manage the hydrological impacts of forests. A field study was conducted at 3 plots of larch (Larix principis-rupprechtii) plantation in the semi-humid area of the Liupan Mountains, northwest China. The main influencing factors were the atmospheric evaporative demand expressed by potential evapotranspiration (PET), the soil water availability expressed by volumetric soil moisture (VSM) within the 0–100 cm layer, and the canopy transpiration capacity expressed by forest canopy leaf area index (LAI). The daily stand T was estimated through the up-scaling of sap-flow data from sampled trees. It displayed a high degree of scattering in response to PET, VSM and LAI, with an average of 0.76 mm·day−1 and range of 0.01–1.71 mm·day−1 in the growing season of 2014. Using upper boundary lines of measured data, the response tendency of T to each factor and corresponding function type were determined. The T increases firstly rapidly with rising PET, VSM and LAI, then gradually and tends to be stable when the threshold of PET (3.80 mm·day−1), VSM (0.28 m3·m−3) and LAI (3.7) is reached. The T response follows a quadratic equation for PET and saturated exponential function for VSM and LAI. These individual factor functions were coupled to form a general daily T model which was then fitted using measured data as: T = (0.793PET − 0.078PET2)·(1 − exp(−0.272LAI))·(1 − exp(−9.965VSM)). It can well explain the daily T variation of all 3 plots (R2 = 0.86–0.91), and thus can be used to predict the response of daily T of larch stands to changes in both environmental and canopy conditions.
Collapse
Affiliation(s)
- Yunni Wang
- Inner Mongolia Academy of Forestry Sciences, Hohhot, 010010, China.,Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China
| | - Gongxiang Cao
- Inner Mongolia Academy of Forestry Sciences, Hohhot, 010010, China.,Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China
| | - Yanhui Wang
- Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China.
| | - Ashley A Webb
- NSW Department of Primary Industries, Tamworth Agricultural Institute, Calala, NSW, 2340, Australia.,WaterNSW, PO Box 1251, Tamworth, NSW, 2340, Australia
| | - Pengtao Yu
- Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China
| | - Xiaojiang Wang
- Inner Mongolia Academy of Forestry Sciences, Hohhot, 010010, China
| |
Collapse
|
29
|
Barba J, Poyatos R, Vargas R. Automated measurements of greenhouse gases fluxes from tree stems and soils: magnitudes, patterns and drivers. Sci Rep 2019; 9:4005. [PMID: 30850622 PMCID: PMC6408546 DOI: 10.1038/s41598-019-39663-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 01/29/2019] [Indexed: 11/19/2022] Open
Abstract
Tree stems exchange CO2, CH4 and N2O with the atmosphere but the magnitudes, patterns and drivers of these greenhouse gas (GHG) fluxes remain poorly understood. Our understanding mainly comes from static-manual measurements, which provide limited information on the temporal variability and magnitude of these fluxes. We measured hourly CO2, CH4 and N2O fluxes at two stem heights and adjacent soils within an upland temperate forest. We analyzed diurnal and seasonal variability of fluxes and biophysical drivers (i.e., temperature, soil moisture, sap flux). Tree stems were a net source of CO2 (3.80 ± 0.18 µmol m-2 s-1; mean ± 95% CI) and CH4 (0.37 ± 0.18 nmol m-2 s-1), but a sink for N2O (-0.016 ± 0.008 nmol m-2 s-1). Time series analysis showed diurnal temporal correlations between these gases with temperature or sap flux for certain days. CO2 and CH4 showed a clear seasonal pattern explained by temperature, soil water content and sap flux. Relationships between stem, soil fluxes and their drivers suggest that CH4 for stem emissions could be partially produced belowground. High-frequency measurements demonstrate that: a) tree stems exchange GHGs with the atmosphere at multiple time scales; and b) are needed to better estimate fluxes magnitudes and understand underlying mechanisms of GHG stem emissions.
Collapse
Affiliation(s)
- Josep Barba
- Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware, 19716, USA
| | - Rafael Poyatos
- CREAF, Cerdanyola del Vallès, 08193, Barcelona, Catalonia, Spain
- Laboratory of Plant Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, 9000, Belgium
| | - Rodrigo Vargas
- Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware, 19716, USA.
| |
Collapse
|
30
|
Benson AR, Koeser AK, Morgenroth J. Estimating conductive sapwood area in diffuse and ring porous trees with electronic resistance tomography. TREE PHYSIOLOGY 2019; 39:484-494. [PMID: 30304488 DOI: 10.1093/treephys/tpy092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Revised: 05/18/2018] [Accepted: 07/28/2018] [Indexed: 06/08/2023]
Abstract
Accurately estimating sapwood area is essential for modelling whole-tree or stand-scale transpiration from point-flow sap-flux observations. In this study, we tested the validity of electrical resistance tomography (ERT) to locate the sapwood-heartwood (SW/HW) interface for two ring porous (Quercus nigra L. and Quercus virginiana Mill.) and one diffuse porous (Acer rubrum L.) species. Estimates derived from the ERT analyses were compared with the SW/HW interface measured following dye perfusion testing. The ERT results revealed spatial variation in electrical resistance, with higher resistivity in the inner part of the cross sections. Regression analyses showed that ERT was able to accurately account for 97% and 80% of the variation in sapwood area (calculated as R2) for Q. virginiana (n = 19) and Q. nigra (n = 7), respectively, and 56% of the variation in the diffuse porous species (n = 8). Root mean square error (RMSE) values for sapwood areas of the ring porous species were 11.12 cm2 (19%) and 25.98 cm2 (33%) for Q. virginiana and Q. nigra, respectively. Sapwood area estimates for diffuse wood carried greater error (RMSE = 33.52 cm2 (131%)). Model bias for all sapwood area estimates was negative, suggesting that ERT had a tendency to overestimate sapwood areas. Electrical resistance tomography proved to be a significant predictor of sapwood area in the three investigated species, although it was more reliable for ring porous wood. In addition to the results, a comprehensive code sequence for use with R statistical software is provided, so that other investigators may follow the same method.
Collapse
Affiliation(s)
- Andrew R Benson
- New Zealand School of Forestry, University of Canterbury, Private Bag, Christchurch, New Zealand
| | - Andrew K Koeser
- Department of Environmental Horticulture, CLCE, IFAS, University of Florida - Gulf Coast Research and Education Center, Wimauma, FL, USA
| | - Justin Morgenroth
- New Zealand School of Forestry, University of Canterbury, Private Bag, Christchurch, New Zealand
| |
Collapse
|
31
|
Grossiord C, Gessler A, Reed SC, Borrego I, Collins AD, Dickman LT, Ryan M, Schönbeck L, Sevanto S, Vilagrosa A, McDowell NG. Reductions in tree performance during hotter droughts are mitigated by shifts in nitrogen cycling. PLANT, CELL & ENVIRONMENT 2018; 41:2627-2637. [PMID: 29974965 DOI: 10.1111/pce.13389] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 06/14/2018] [Accepted: 06/15/2018] [Indexed: 05/16/2023]
Abstract
Climate warming should result in hotter droughts of unprecedented severity in this century. Such droughts have been linked with massive tree mortality, and data suggest that warming interacts with drought to aggravate plant performance. Yet how forests will respond to hotter droughts remains unclear, as does the suite of mechanisms trees use to deal with hot droughts. We used an ecosystem-scale manipulation of precipitation and temperature on piñon pine (Pinus edulis) and juniper (Juniperus monosperma) trees to investigate nitrogen (N) cycling-induced mitigation processes related to hotter droughts. We found that while negative impacts on plant carbon and water balance are manifest after prolonged drought, performance reductions were not amplified by warmer temperatures. Rather, increased temperatures for 5 years stimulated soil N cycling under piñon trees and modified tree N allocation for both species, resulting in mitigation of hotter drought impacts on tree water and carbon functions. These findings suggest that adjustments in N cycling are likely after multi-year warming conditions and that such changes may buffer reductions in tree performance during hotter droughts. The results highlight our incomplete understanding of trees' ability to acclimate to climate change, raising fundamental questions about the resistance potential of forests to long-term, compound climatic stresses.
Collapse
Affiliation(s)
- Charlotte Grossiord
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA
- Swiss Federal Research Institute WSL, Birmensdorf, Switzerland
| | - Arthur Gessler
- Swiss Federal Research Institute WSL, Birmensdorf, Switzerland
| | - Sasha C Reed
- US Geological Survey, Southwest Biological Science Center, Moab, UT
| | - Isaac Borrego
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA
- US Geological Survey, Southwest Biological Science Center, Moab, UT
| | - Adam D Collins
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Lee T Dickman
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Max Ryan
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA
| | | | - Sanna Sevanto
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Alberto Vilagrosa
- Fundación CEAM, Joint Research Unit University of Alicante - CEAM, University of Alicante, Alicante, Spain
| | - Nate G McDowell
- Earth Systems Science Division, Pacific Northwest National Laboratory, Richland, WA, USA
| |
Collapse
|
32
|
Dietrich L, Hoch G, Kahmen A, Körner C. Losing half the conductive area hardly impacts the water status of mature trees. Sci Rep 2018; 8:15006. [PMID: 30301936 PMCID: PMC6177434 DOI: 10.1038/s41598-018-33465-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 09/26/2018] [Indexed: 11/13/2022] Open
Abstract
The water status of transpiring tree crowns depends on a hydraulic continuum from the soil matrix around roots to the sub-stomatal cavity of leaves, with a multitude of hydraulic resistances along this path. Although the stem xylem path may not be the most critical of these resistances, it had been suggested that a >50% interruption of that path by drought-stress-induced embolization (air filling) of conduits is critical for tree survival. Here we show that cutting the sapwood of mature, 35 m tall trees in half hardly affects crown water status and transpiration. Counter expectation, this first adult tree sapwood interception experiment revealed that shoot water potential in the canopy (assessed by using a 45 m canopy crane) either remained unaffected (spruce) or became less negative (beech), associated with small reductions in leaf diffusive conductance for water vapour. We conclude that the stem xylem of these trees has a large overcapacity and the tree hydraulics debate requires a critical re-visitation.
Collapse
Affiliation(s)
- Lars Dietrich
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland.
| | - Günter Hoch
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Ansgar Kahmen
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Christian Körner
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| |
Collapse
|
33
|
Peters RL, Fonti P, Frank DC, Poyatos R, Pappas C, Kahmen A, Carraro V, Prendin AL, Schneider L, Baltzer JL, Baron-Gafford GA, Dietrich L, Heinrich I, Minor RL, Sonnentag O, Matheny AM, Wightman MG, Steppe K. Quantification of uncertainties in conifer sap flow measured with the thermal dissipation method. THE NEW PHYTOLOGIST 2018; 219:1283-1299. [PMID: 29862531 DOI: 10.1111/nph.15241] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 04/24/2018] [Indexed: 06/08/2023]
Abstract
Trees play a key role in the global hydrological cycle and measurements performed with the thermal dissipation method (TDM) have been crucial in providing whole-tree water-use estimates. Yet, different data processing to calculate whole-tree water use encapsulates uncertainties that have not been systematically assessed. We quantified uncertainties in conifer sap flux density (Fd ) and stand water use caused by commonly applied methods for deriving zero-flow conditions, dampening and sensor calibration. Their contribution has been assessed using a stem segment calibration experiment and 4 yr of TDM measurements in Picea abies and Larix decidua growing in contrasting environments. Uncertainties were then projected on TDM data from different conifers across the northern hemisphere. Commonly applied methods mostly underestimated absolute Fd . Lacking a site- and species-specific calibrations reduced our stand water-use measurements by 37% and induced uncertainty in northern hemisphere Fd . Additionally, although the interdaily variability was maintained, disregarding dampening and/or applying zero-flow conditions that ignored night-time water use reduced the correlation between environment and Fd . The presented ensemble of calibration curves and proposed dampening correction, together with the systematic quantification of data-processing uncertainties, provide crucial steps in improving whole-tree water-use estimates across spatial and temporal scales.
Collapse
Affiliation(s)
- Richard L Peters
- Landscape Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
- Department of Environmental Sciences - Botany, Basel University, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Patrick Fonti
- Landscape Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
| | - David C Frank
- Landscape Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
- Laboratory of Tree-Ring Research, 1215 E. Lowell Street, Tucson, AZ, 8572, USA
- Oeschger Centre for Climate Change Research, Falkenplatz 16, CH-3012, Bern, Switzerland
| | - Rafael Poyatos
- CREAF, E08193, Bellaterra (Cerdanyola del Vallès), Catalonia, Spain
- Faculty of Bioscience Engineering, Department of Plants and Crops, Laboratory of Plant Ecology, Ghent University, Coupure links 653, B-9000, Ghent, Belgium
| | - Christoforos Pappas
- Département de géographie and Centre d'études nordiques, Université de Montréal, Montréal, QC, H2V 2B8, Canada
| | - Ansgar Kahmen
- Department of Environmental Sciences - Botany, Basel University, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Vinicio Carraro
- Department TeSAF Territorio e Sistemi Agro-Forestali, Università degli Studi di Padova, Viale dell'Università 16, I-35020, Legnaro, PD, Italy
| | - Angela Luisa Prendin
- Department TeSAF Territorio e Sistemi Agro-Forestali, Università degli Studi di Padova, Viale dell'Università 16, I-35020, Legnaro, PD, Italy
- Department of Bioscience, Ecoinformatic & Biodiversity, Aarhus University, Ny Munkegade 116, Building 1540, DK-8000, Aarhus C, Denmark
| | - Loïc Schneider
- Landscape Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
| | - Jennifer L Baltzer
- Biology Department, Wilfrid Laurier University, 75 University Ave. W, Waterloo, ON, N2L 3C5, Canada
| | - Greg A Baron-Gafford
- School of Geography and Development, University of Arizona, 1064 E Lowell St, Tucson, AZ, 85719, USA
| | - Lars Dietrich
- Department of Environmental Sciences - Botany, Basel University, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Ingo Heinrich
- Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Climate Dynamics and Landscape Evolution, Telegrafenberg, 14473, Potsdam, Germany
| | - Rebecca L Minor
- School of Geography and Development, University of Arizona, 1064 E Lowell St, Tucson, AZ, 85719, USA
| | - Oliver Sonnentag
- Département de géographie and Centre d'études nordiques, Université de Montréal, Montréal, QC, H2V 2B8, Canada
| | - Ashley M Matheny
- Department of Geological Sciences, Jackson School of Geosciences, 2305 Speedway Stop, C1160, Austin, TX, USA
| | - Maxwell G Wightman
- College of Forestry, Oregon State University, 1500 SW Jefferson St, Corvallis, OR, 97331, USA
| | - Kathy Steppe
- Faculty of Bioscience Engineering, Department of Plants and Crops, Laboratory of Plant Ecology, Ghent University, Coupure links 653, B-9000, Ghent, Belgium
| |
Collapse
|
34
|
Miyazawa Y, Du S, Taniguchi T, Yamanaka N, Kumagai T. Gas exchange by the mesic-origin, arid land plantation species Robinia pseudoacacia under annual summer reduction in plant hydraulic conductance. TREE PHYSIOLOGY 2018; 38:1166-1179. [PMID: 29608763 DOI: 10.1093/treephys/tpy032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 03/06/2018] [Indexed: 06/08/2023]
Abstract
The mesic-origin plantation species Robinia pseudoacacia L. has been successfully grown in many arid land plantations around the world but often exhibits dieback and reduced growth due to drought. Therefore, to explore the behavior of this species under changing environmental conditions, we examined the relationship between ecophysiological traits, gas exchange and plant hydraulics over a 3-year period in trees that experienced reduced plant hydraulic conductance (Gp) in summer. We found that the transpiration rate, stomatal conductance (Gs) and minimum leaf water potential (Ψlmin) decreased in early summer in response to a decrease in Gp, and that Gp did not recover until the expansion of new leaves in spring. However, we did not observe any changes in the leaf area index or other ecophysiological traits at the leaf level in response to this reduction in Gp. Furthermore, model simulations based on measured data revealed that the canopy-scale photosynthetic rate (Ac) was 15-25% higher than the simulated Ac when it was assumed that Ψlmin remained constant after spring but almost the same as the simulated Ac when it was assumed that Gp remained high even after spring. These findings indicate that R. pseudoacacia was frequently exposed to a reduced Gp at the study site but offset its effects on Ac by plastically lowering Ψlmin to avoid experiencing any further reduction in Gp or Gs.
Collapse
Affiliation(s)
- Yoshiyuki Miyazawa
- Department of Geography, University of Hawai'i at Manoa, Honolulu, HI, USA
- Research Institute for East Asian Environments, Kyushu University, 744 Motooka, Fukuoka, Japan
| | - Sheng Du
- State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi, China
| | - Takeshi Taniguchi
- Aridland Research Center, Tottori University, Hamasaka, Tottori, Japan
| | - Norikazu Yamanaka
- Aridland Research Center, Tottori University, Hamasaka, Tottori, Japan
| | - Tomo'omi Kumagai
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, Japan
| |
Collapse
|
35
|
Butz P, Hölscher D, Cueva E, Graefe S. Tree Water Use Patterns as Influenced by Phenology in a Dry Forest of Southern Ecuador. FRONTIERS IN PLANT SCIENCE 2018; 9:945. [PMID: 30034407 PMCID: PMC6043675 DOI: 10.3389/fpls.2018.00945] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 06/12/2018] [Indexed: 06/08/2023]
Abstract
Tropical dry forests are composed of tree species with different drought coping strategies and encompass heterogeneous site conditions. Actual water use will be controlled by soil moisture availability. In a premontane dry forest of southern Ecuador, tree water use patterns of four tree species of different phenologies were studied along an elevational gradient, in which soil moisture availability increases with altitude. Main interest was the influence of variation in soil moisture, vapor pressure deficit, species (representing phenology), elevation, and tree diameter on water use. Special emphasis was put on the stem succulent, deciduous Ceiba trichistandra, as high water use rates and drought coping involving stem succulence was to be expected. Tree water use rates increased linearly with diameter across species at high soil water content. However, when soil moisture declined, sap flux densities of the species responded differently. The stem succulent, deciduous Ceiba and other deciduous tree species reduced sap flux sensitively, whereas sap flux densities of the evergreen (broad leaved) Capparis scabrida were increasing. This was also reflected in diurnal hysteresis loops of sap flux vs. vapor pressure deficit (VPD) of the air. Under dry soil conditions, Ceiba and other deciduous tree species had much smaller areas in the hysteresis loop, whereas the area of Capparis was largely enhanced compared to wet conditions. The evergreen Capparis potentially had access to deeper soil water resources as water use patterns suggest that top soil drought was tolerated. The deciduous species followed a drought avoidance strategy by being leafless in the dry season. The stem succulent deciduous Ceiba flushed leaves at the end of the dry season before the rainy season began and also re-flushed early in the dry season after a rain event; however, water use rates at this occasion remained low. Ceiba was also ready for fast and strong response in water use when conditions were most favorable during the wet season. The study thus indicates a strong influence of species' drought coping strategy on water use patterns in tropical dry forests.
Collapse
Affiliation(s)
- Philipp Butz
- Tropical Silviculture and Forest Ecology, University of Göttingen, Göttingen, Germany
| | - Dirk Hölscher
- Tropical Silviculture and Forest Ecology, University of Göttingen, Göttingen, Germany
| | | | - Sophie Graefe
- Tropical Silviculture and Forest Ecology, University of Göttingen, Göttingen, Germany
| |
Collapse
|
36
|
Ghimire CP, Bruijnzeel LA, Lubczynski MW, Zwartendijk BW, Odongo VO, Ravelona M, van Meerveld HJI. Transpiration and stomatal conductance in a young secondary tropical montane forest: contrasts between native trees and invasive understorey shrubs. TREE PHYSIOLOGY 2018; 38:1053-1070. [PMID: 29688549 DOI: 10.1093/treephys/tpy004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 01/09/2018] [Indexed: 06/08/2023]
Abstract
It has been suggested that vigorous secondary tropical forests can have very high transpiration rates, but sap flow and stomatal conductance dynamics of trees and shrubs in these forests are understudied. In an effort to address this knowledge gap, sap flow (thermal dissipation method, 12 trees) and stomatal conductance (porometry, six trees) were measured for young (5-7 years) Psiadia altissima (DC.) Drake trees, a widely occurring species dominating young regrowth following abandonment of swidden agriculture in upland eastern Madagascar. In addition, stomatal conductance (gs) was determined for three individuals of two locally common invasive shrubs (Lantana camara L. and Rubus moluccanus L.) during three periods with contrasting soil moisture conditions. Values of gs for the three investigated species were significantly higher and more sensitive to climatic conditions during the wet period compared with the dry period. Further, gs of the understorey shrubs was much more sensitive to soil moisture content than that of the trees. Tree transpiration rates (Ec) were relatively stable during the dry season and were only affected somewhat by soil water content at the end of the dry season, suggesting the trees had continued access to soil water despite drying out of the topsoil. The Ec exhibited a plateau-shaped relation with vapour pressure deficit (VPD), which was attributed to stomatal closure at high VPD. Vapour pressure deficit was the major driver of variation in Ec, during both the wet and the dry season. Overall water use of the trees was modest, possibly reflecting low site fertility after three swidden cultivation cycles. The observed contrast in gs response to soil water and climatic conditions for the trees and shrubs underscores the need to take root distributions into account when modelling transpiration from regenerating tropical forests.
Collapse
Affiliation(s)
- Chandra Prasad Ghimire
- Faculty of Geo-information and Earth Observation (ITC), University of Twente, Enschede, Hengelosestraat 99, AE Enschede, The Netherlands
| | - L Adrian Bruijnzeel
- Department of Geography, King's College London, London, UK
- Tropical Forests and People Research Centre, University of the Sunshine Coast, Maroochydore DC, QLD, Queensland, Australia
| | - Maciek W Lubczynski
- Faculty of Geo-information and Earth Observation (ITC), University of Twente, Enschede, Hengelosestraat 99, AE Enschede, The Netherlands
| | - Bob W Zwartendijk
- Department of Geography, Hydrology and Climate, University of Zurich, Winterthurerstrasse 190, Zurich, Switzerland
| | - Vincent Omondi Odongo
- Department of Agricultural Engineering, Egerton University, PO Box 536, Egerton, Njoro, Kenya
- Water Resources Management Group, Wageningen University & Research, AA Wageningen, The Netherlands
| | - Maafaka Ravelona
- Laboratoire des Radio-Isotopes, University of Antananarivo, BP 3383, Route d'Andraisoro, 101 Antananarivo, Madagascar
| | - H J Ilja van Meerveld
- Department of Geography, Hydrology and Climate, University of Zurich, Winterthurerstrasse 190, Zurich, Switzerland
| |
Collapse
|
37
|
Wang Q, Gao J, Zhao P, Zhu L, Ouyang L, Ni G, Zhao X. Biotic- and abiotic-driven variations of the night-time sap flux of three co-occurring tree species in a low subtropical secondary broadleaf forest. AOB PLANTS 2018; 10:ply025. [PMID: 29977485 PMCID: PMC6007443 DOI: 10.1093/aobpla/ply025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 04/18/2018] [Indexed: 05/31/2023]
Abstract
Although several studies on the night-time water use of different plant species have been reported, comparative studies under the same climatic conditions of a region are scarce. This study aimed to analyse the inter- and intraspecific variations in night-time water use in relation to environmental factors and to tree morphological features to understand and elucidate the possible underlying mechanisms. The sap flow of three co-occurring tree species in a low subtropical secondary broadleaf forest in South China was monitored using Granier-style sap flux sensors. All examined environmental factors except wind speed exerted significant influence on the daytime sap flows of Schima superba, Castanopsis hystrix and Michelia macclurei, but the impacts of all factors, including wind speed, on the night-time sap flux were trivial. These results indicated that sap flow was mainly used for water recharge at night. The morphological features of the trees, except tree height, significantly affected the daytime water use, but no morphological features significantly affected the night-time water use. We found that night-time water recharge was strongly affected by the maximum flux density. A principal component analysis showed that there were more intraspecific than interspecific variations in water transport. The results also revealed that the night-time water use and the percentage of night/day (Qn/Qd) of photosynthetic stem species (C. hystrix and M. macclurei) were greater than those of non-photosynthetic stem species (S. superba).
Collapse
Affiliation(s)
- Qian Wang
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, PR China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, PR China
| | - Jianguo Gao
- Institute of Biodiversity Science, Fudan University, Shanghai, PR China
| | - Ping Zhao
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, PR China
- Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, PR China
| | - Liwei Zhu
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, PR China
| | - Lei Ouyang
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, PR China
| | - Guangyan Ni
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, PR China
| | - Xiuhua Zhao
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, PR China
| |
Collapse
|
38
|
Improved Water Consumption Estimates of Black Locust Plantations in China’s Loess Plateau. FORESTS 2018. [DOI: 10.3390/f9040201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
39
|
Water Level Controls on Sap Flux of Canopy Species in Black Ash Wetlands. FORESTS 2018. [DOI: 10.3390/f9030147] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
40
|
Zhao H, Yang S, Guo X, Peng C, Gu X, Deng C, Chen L. Anatomical explanations for acute depressions in radial pattern of axial sap flow in two diffuse-porous mangrove species: implications for water use. TREE PHYSIOLOGY 2018; 38:276-286. [PMID: 29346677 DOI: 10.1093/treephys/tpx172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 12/20/2017] [Indexed: 06/07/2023]
Abstract
Mangrove species have developed uniquely efficient water-use strategies in order to survive in highly saline and anaerobic environments. Herein, we estimated the stand water use of two diffuse-porous mangrove species of the same age, Sonneratia apetala Buch. Ham and Sonneratia caseolaris (L.) Engl., growing in a similar intertidal environment. Specifically, to investigate the radial patterns of axial sap flow density (Js) and understand the anatomical traits associated with them, we measured axial sap flow density in situ together with micromorphological observations. A significant decrease of Js was observed for both species. This result was accompanied by the corresponding observations of wood structure and blockages in xylem sapwood, which appeared to influence and, hence, explained the acute radial reductions of axial sap flow in the stems of both species. However, higher radial resistance in sapwood of S. caseolaris caused a steeper decline of Js radially when compared with S. apetala, thus explaining the latter's more efficient use of water. Without first considering acute reductions in Js into the sapwood from the outer bark, a total of ~55% and 51% of water use would have been overestimated, corresponding to average discrepancies in stand water use of 5.6 mm day-1 for S. apetala trees and 2.5 mm day-1 for S. caseolaris trees. This suggests that measuring radial pattern of Js is a critical factor in determining whole-tree or stand water use.
Collapse
Affiliation(s)
- Hewei Zhao
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361102, China
| | - Shengchang Yang
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361102, China
| | - Xudong Guo
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361102, China
| | - Congjiao Peng
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361102, China
| | - Xiaoxuan Gu
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361102, China
| | - Chuanyuan Deng
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Luzhen Chen
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361102, China
| |
Collapse
|
41
|
Wu X, Tang Y, Chen Y, Wen J, Xie Y, Lu S. Sap flow characteristics and responses to summer rainfall for Pinus tabulaeformis and Hippophae rhamnoides in the Loess hilly region of China. Ecol Evol 2018; 8:617-630. [PMID: 29321898 PMCID: PMC5756875 DOI: 10.1002/ece3.3639] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 09/15/2017] [Accepted: 10/08/2017] [Indexed: 11/10/2022] Open
Abstract
As a major driving element of the structure and function of arid and semiarid ecosystems, rainfall is the essential factor limiting plant biological processes. To clarify the characteristics of transpiration and responses to summer rainfall, sap flow density (Fd) of Pinus tabulaeformis and Hippophae rhamnoides was monitored using thermal dissipation probes. In addition, midday leaf water potential (ψm) and leaf stomatal conductance (Gs) were also analyzed to determine water use strategies. The results indicated that the diurnal variation in the normalized Fd values exhibited a single-peak curve for P. tabulaeformis, while H. rhamnoides showed multiple peaks. The normalized Fd for P. tabulaeformis remained relatively stable regardless of rainfall events. However, there was also a significant increase in the normalized Fd for H. rhamnoides in response to rainfall in June and August (p < .05), although no significant differences were observed in July. The normalized Fd values for P. tabulaeformis and H. rhamnoides fitted well with the derived variable of transpiration, an integrated index calculated from the vapor pressure deficit and solar radiation (Rs), using an exponential saturation function. The differences in fitting coefficients suggested that H. rhamnoides showed more sensitivity to summer rainfall (p < .01) than P. tabulaeformis. Furthermore, during the study period, P. tabulaeformis reduced Gs as soil water decreased, maintaining a relatively constant ψm; while H. rhamnoides allowed large fluctuations in ψm to maintain Gs. Therefore, P. tabulaeformis and H. rhamnoides should be considered isohydric and anisohydric species, respectively. And more consideration should be taken for H. rhamnoides in the afforestation activities and the local plantation management under the context of the frequently seasonal drought in the loess hilly region.
Collapse
Affiliation(s)
- Xu Wu
- State Key Laboratory of Soil Erosion and Dry‐Land Farming on the Loess PlateauInstitute of Soil and Water ConservationChinese Academy of SciencesMinistry of Water ResourcesYanglingShaanxiChina
- University of Chinese Academy of ScienceBeijingChina
| | - Yakun Tang
- Institute of Soil and Water ConservationNorthwest Agriculture and Forestry UniversityYanglingShaanxiChina
| | - Yunming Chen
- State Key Laboratory of Soil Erosion and Dry‐Land Farming on the Loess PlateauInstitute of Soil and Water ConservationChinese Academy of SciencesMinistry of Water ResourcesYanglingShaanxiChina
- Institute of Soil and Water ConservationNorthwest Agriculture and Forestry UniversityYanglingShaanxiChina
| | - Jie Wen
- College of ForestryNorthwest Agriculture and Forestry UniversityYanglingShaanxiChina
| | - Yuli Xie
- State Key Laboratory of Soil Erosion and Dry‐Land Farming on the Loess PlateauInstitute of Soil and Water ConservationChinese Academy of SciencesMinistry of Water ResourcesYanglingShaanxiChina
- University of Chinese Academy of ScienceBeijingChina
| | - Senbao Lu
- College of ForestryNorthwest Agriculture and Forestry UniversityYanglingShaanxiChina
| |
Collapse
|
42
|
Ma C, Luo Y, Shao M, Li X, Sun L, Jia X. Environmental controls on sap flow in black locust forest in Loess Plateau, China. Sci Rep 2017; 7:13160. [PMID: 29030585 PMCID: PMC5640688 DOI: 10.1038/s41598-017-13532-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 09/25/2017] [Indexed: 11/26/2022] Open
Abstract
Black locust accounts for over 90% of artificial forests in China's Loess Plateau region. However, water use of black locust is an uphill challenge for this semi-arid region. To accurately quantify tree water use and to explain the related hydrological processes, it is important to collect reliable data for application in the estimation of sap flow and its response to environmental factors. This study measured sap flow in black locust in the 2015 and 2016 growth seasons using the thermal dissipation probes technique and laboratory-calibrated Granier's equation. The study showed that the laboratory calibrated coefficient α was much larger than the original value presented by Granier, while the coefficient β was similar to the original one. The average daily transpiration was 2.1 mm day-1 for 2015 and 1.6 mm day-1 for 2016. Net solar radiation (Rn) was the key meteorological factor controlling sap flow, followed by vapor pressure deficit (VPD) and then temperature (T). VPD had a threshold control on sap flow at threshold values of 1.9 kPa for 2015 and 1.6 kPa for 2016. The effects of diurnal hysteresis of Rn, VPD and T on sap flow were evident, indicating that black locust water use was conservative.
Collapse
Affiliation(s)
- Changkun Ma
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Yi Luo
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China.
| | - Mingan Shao
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China.
| | - Xiangdong Li
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Lin Sun
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Xiaoxu Jia
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China
| |
Collapse
|
43
|
Yi K, Dragoni D, Phillips RP, Roman DT, Novick KA. Dynamics of stem water uptake among isohydric and anisohydric species experiencing a severe drought. TREE PHYSIOLOGY 2017; 37:1379-1392. [PMID: 28062727 DOI: 10.1093/treephys/tpw126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 12/22/2016] [Indexed: 06/06/2023]
Abstract
Predicting the impact of drought on forest ecosystem processes requires an understanding of trees' species-specific responses to drought, especially in the Eastern USA, where species composition is highly dynamic due to historical changes in land use and fire regime. Here, we adapted a framework that classifies trees' water-use strategy along the spectrum of isohydric to anisohydric behavior to determine the responses of three canopy-dominant species to drought. We used a collection of leaf-level gas exchange, tree-level sap flux and stand-level eddy covariance data collected in south-central Indiana from 2011 to 2013, which included an unusually severe drought in the summer of 2012. Our goal was to assess how patterns in the radial profile of sap flux and reliance on hydraulic capacitance differed among species of contrasting water-use strategies. In isohydric species, which included sugar maple (Acer saccharum Marsh.) and tulip poplar (Liriodendron tulipifera L.), we found that the sap flux in the outer xylem experienced dramatic declines during drought, but sap flux at inner xylem was buffered from reductions in water availability. In contrast, for anisohydric oak species (Quercus alba L. and Quercus rubra L.), we observed relatively smaller variations in sap flux during drought in both inner and outer xylem, and higher nighttime refilling when compared with isohydric species. This reliance on nocturnal refilling, which occurred coincident with a decoupling between leaf- and tree-level water-use dynamics, suggests that anisohydric species may benefit from a reliance on hydraulic capacitance to mitigate the risk of hydraulic failure associated with maintaining high transpiration rates during drought. In the case of both isohydric and anisohydric species, our work demonstrates that failure to account for shifts in the radial profile of sap flux during drought could introduce substantial bias in estimates of tree water use during both drought and non-drought periods.
Collapse
Affiliation(s)
- Koong Yi
- School of Public and Environmental Affairs, Indiana University Bloomington, 1315 East Tenth Street, Bloomington, IN 47405, USA
| | - Danilo Dragoni
- Department of Geography, Indiana University Bloomington, 701 East Kirkwood Avenue, Bloomington, IN 47405, USA
| | - Richard P Phillips
- Department of Biology, Indiana University Bloomington, 1001 East Third Street, Bloomington, IN 47405, USA
| | - D Tyler Roman
- US Department of Agriculture Forest Service, Northern Research Station, 1831 Highway 169 East , Grand Rapids, MN 55744, USA
| | - Kimberly A Novick
- School of Public and Environmental Affairs, Indiana University Bloomington, 1315 East Tenth Street, Bloomington, IN 47405, USA
| |
Collapse
|
44
|
Grossiord C, Sevanto S, Borrego I, Chan AM, Collins AD, Dickman LT, Hudson PJ, McBranch N, Michaletz ST, Pockman WT, Ryan M, Vilagrosa A, McDowell NG. Tree water dynamics in a drying and warming world. PLANT, CELL & ENVIRONMENT 2017; 40:1861-1873. [PMID: 28556263 DOI: 10.1111/pce.12991] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 05/02/2017] [Accepted: 05/09/2017] [Indexed: 05/16/2023]
Abstract
Disentangling the relative impacts of precipitation reduction and vapour pressure deficit (VPD) on plant water dynamics and determining whether acclimation may influence these patterns in the future is an important challenge. Here, we report sap flux density (FD ), stomatal conductance (Gs ), hydraulic conductivity (KL ) and xylem anatomy in piñon pine (Pinus edulis) and juniper (Juniperus monosperma) trees subjected to five years of precipitation reduction, atmospheric warming (elevated VPD) and their combined effects. No acclimation occurred under precipitation reduction: lower Gs and FD were found for both species compared to ambient conditions. Warming reduced the sensibility of stomata to VPD for both species but resulted in the maintenance of Gs and FD to ambient levels only for piñon. For juniper, reduced soil moisture under warming negated benefits of stomatal adjustments and resulted in reduced FD , Gs and KL . Although reduced stomatal sensitivity to VPD also occurred under combined stresses, reductions in Gs , FD and KL took place to similar levels as under single stresses for both species. Our results show that stomatal conductance adjustments to high VPD could minimize but not entirely prevent additive effects of warming and drying on water use and carbon acquisition of trees in semi-arid regions.
Collapse
Affiliation(s)
- Charlotte Grossiord
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Sanna Sevanto
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Isaac Borrego
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Allison M Chan
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Adam D Collins
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Lee T Dickman
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Patrick J Hudson
- Department of Biology, MSC03 202, University of New Mexico, Albuquerque, NM, 87131-0001, USA
| | - Natalie McBranch
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Sean T Michaletz
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - William T Pockman
- Department of Biology, MSC03 202, University of New Mexico, Albuquerque, NM, 87131-0001, USA
| | - Max Ryan
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Alberto Vilagrosa
- Fundación CEAM, Joint Research Unit University of Alicante - CEAM, Univ. Alicante, PO Box 99, 03080, Alicante, Spain
| | - Nate G McDowell
- Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| |
Collapse
|
45
|
Chan AM, Bowling DR. Assessing the thermal dissipation sap flux density method for monitoring cold season water transport in seasonally snow-covered forests. TREE PHYSIOLOGY 2017; 37:984-995. [PMID: 28549168 DOI: 10.1093/treephys/tpx049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 05/03/2017] [Indexed: 06/07/2023]
Abstract
Productivity of conifers in seasonally snow-covered forests is high before and during snowmelt when environmental conditions are optimal for photosynthesis. Climate change is altering the timing of spring in many locations, and changes in the date of transition from winter dormancy can have large impacts on annual productivity. Sap flow methods provide a promising approach to monitor tree activity during the cold season and the winter-spring and fall-winter transitions. Although sap flow techniques have been widely used, cold season results are generally not reported. Here we examine the feasibility of using the Granier thermal dissipation (TD) sap flux density method to monitor transpiration and dormancy of evergreen conifers during the cold season. We conducted a laboratory experiment which demonstrated that the TD method reliably detects xylem water transport (when it occurs) both at near freezing temperature and at low flow rate, and that the sensors can withstand repeated freeze-thaw events. However, the dependence between sensor output and water transport rate in these experiments differed from the established TD relation. In field experiments, sensors installed in two Abies forests lasted through two winters and a summer with low failure. The baseline (no-flow) sensor output varied considerably with temperature during the cold season, and a new baseline algorithm was developed to accommodate this variation. The Abies forests differed in elevation (2070 and 2620 m), and there was a clear difference in timing of initiation and cessation of transpiration between them. We conclude that the TD method can be reliably used to examine water transport during cold periods with associated low flow conditions.
Collapse
Affiliation(s)
- Allison M Chan
- Department of Biology, University of Utah, 257 South 1400 East, Salt Lake City, UT 84112, USA
- Los Alamos National Laboratory, Environmental Management Division, Los Alamos, NM 87545, USA
| | - David R Bowling
- Department of Biology, University of Utah, 257 South 1400 East, Salt Lake City, UT 84112, USA
| |
Collapse
|
46
|
Transpiration of trees in a cool temperate forest on Mt. Aso, Japan: comparison of model simulation and measurements. Ecol Res 2017. [DOI: 10.1007/s11284-017-1471-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
47
|
Ichihashi R, Chiu C, Komatsu H, Kume T, Shinohara Y, Tateishi M, Tsuruta K, Otsuki K. Contribution of lianas to community‐level canopy transpiration in a warm‐temperate forest. Funct Ecol 2017. [DOI: 10.1111/1365-2435.12881] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Ryuji Ichihashi
- Graduate School of Agricultural and Life Sciences The University of Tokyo Yayoi Tokyo 113‐8657 Japan
| | - Chen‐Wei Chiu
- Institute of Agriculture Tokyo University of Agriculture and Technology Fuchu Tokyo183‐8509 Japan
| | - Hikaru Komatsu
- The Hakubi Center for Advanced Research Kyoto University Kyoto 606‐8501 Japan
| | - Tomonori Kume
- School of Forestry and Resource Conservation National Taiwan University Taipei 106‐17 Taiwan
| | | | - Makiko Tateishi
- Arid Land Research Center Tottori University Tottori 680‐0001 Japan
| | - Kenji Tsuruta
- Graduate School of Agriculture Kyoto University Kyoto 606‐8502 Japan
| | - Kyoichi Otsuki
- Kasuya Research Forest Kyushu University Sasaguri Fukuoka811‐2415 Japan
| |
Collapse
|
48
|
Tor-Ngern P, Oren R, Oishi AC, Uebelherr JM, Palmroth S, Tarvainen L, Ottosson-Löfvenius M, Linder S, Domec JC, Näsholm T. Ecophysiological variation of transpiration of pine forests: synthesis of new and published results. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2017; 27:118-133. [PMID: 28052502 DOI: 10.1002/eap.1423] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 07/06/2016] [Accepted: 08/01/2016] [Indexed: 06/06/2023]
Abstract
Canopy transpiration (EC ) is a large fraction of evapotranspiration, integrating physical and biological processes within the energy, water, and carbon cycles of forests. Quantifying EC is of both scientific and practical importance, providing information relevant to questions ranging from energy partitioning to ecosystem services, such as primary productivity and water yield. We estimated EC of four pine stands differing in age and growing on sandy soils. The stands consisted of two wide-ranging conifer species: Pinus taeda and Pinus sylvestris, in temperate and boreal zones, respectively. Combining results from these and published studies on all soil types, we derived an approach to estimate daily EC of pine forests, representing a wide range of conditions from 35° S to 64° N latitude. During the growing season and under moist soils, maximum daily EC (ECm ) at day-length normalized vapor pressure deficit of 1 kPa (ECm-ref ) increased by 0.55 ± 0.02 (mean ± SE) mm/d for each unit increase of leaf area index (L) up to L = ~5, showing no sign of saturation within this range of quickly rising mutual shading. The initial rise of ECm with atmospheric demand was linearly related to ECm-ref . Both relations were unaffected by soil type. Consistent with theoretical prediction, daily EC was sensitive to decreasing soil moisture at an earlier point of relative extractable water in loamy than sandy soils. Our finding facilitates the estimation of daily EC of wide-ranging pine forests using remotely sensed L and meteorological data. We advocate an assembly of worldwide sap flux database for further evaluation of this approach.
Collapse
Affiliation(s)
- Pantana Tor-Ngern
- Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina, 27708, USA
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, SE-901 83, Sweden
- Department of Environmental Science, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Ram Oren
- Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina, 27708, USA
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, SE-901 83, Sweden
- Hydrospheric-Atmospheric Research Center, Nagoya University, Chikusa-ku, Nagoya, 464-8601, Japan
| | - Andrew C Oishi
- USDA Forest Service Coweeta Hydrologic Laboratory, 3160 Coweeta Lab Road, Otto, North Carolina, 28763, USA
| | - Joshua M Uebelherr
- School of Public Affairs, Arizona State University, Phoenix, Arizona, 85004, USA
| | - Sari Palmroth
- Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina, 27708, USA
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, SE-901 83, Sweden
| | - Lasse Tarvainen
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, SE-901 83, Sweden
| | - Mikaell Ottosson-Löfvenius
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, SE-901 83, Sweden
| | - Sune Linder
- Southern Swedish Forest Research Centre, SLU, P.O. Box 49, Alnarp, SE-230 53, Sweden
| | - Jean-Christophe Domec
- Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina, 27708, USA
- UMR 1391 ISPA INRA, Bordeaux Sciences AGRO, 1 Cours du général de Gaulle, Gradignan Cedex, 33175, France
| | - Torgny Näsholm
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, SE-901 83, Sweden
| |
Collapse
|
49
|
Wiedemann A, Marañón-Jiménez S, Rebmann C, Herbst M, Cuntz M. An empirical study of the wound effect on sap flux density measured with thermal dissipation probes. TREE PHYSIOLOGY 2016; 36:1471-1484. [PMID: 27587487 DOI: 10.1093/treephys/tpw071] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 06/22/2016] [Accepted: 07/02/2016] [Indexed: 06/06/2023]
Abstract
The insertion of thermal dissipation (TD) sensors on tree stems for sap flux density (SFD) measurements can lead to SFD underestimations due to a wound formation close to the drill hole. However, the wound effect has not been assessed experimentally for this method yet. Here, we propose an empirical approach to investigate the effect of the wound healing on measured sap flux with TD probes. The approach was performed for both, diffuse-porous (Fagus sylvatica (Linnaeus)) and ring-porous (Quercus petraea (Lieblein)) species. Thermal dissipation probes were installed on different dates along the growing season to document the effects of the dynamic wound formation. The trees were cut in autumn and additional sensors were installed in the cut stems, therefore, without potential effects of wound development. A range of water pressures was applied to the stem segments and SFDs were simultaneously measured by TD sensors as well as gravimetrically in the laboratory. The formation of wounds around sensors installed in living tree stems led to underestimation of SFD by 21.4 ± 3 and 47.5 ± 3.8% in beech and oak, respectively. The differences between SFD underestimations of diffuse-porous beech and ring-porous oak were, however, not statistically significant. Sensors with 5-, 11- and 22-week-old wounds also showed no significant differences, which implies that the influence of wound formation on SFD estimates was completed within the first few weeks after perforation. These results were confirmed by time courses of SFD measurements in the field. Field SFD values decreased immediately after sensor installation and reached stable values after ~2 weeks with similar underestimations to the ones observed in the laboratory. We therefore propose a feasible approach to correct directly field observations of SFD for potential underestimations due to the wound effect.
Collapse
Affiliation(s)
- Andreas Wiedemann
- Department Computational Hydrosystems, UFZ-Helmholtz Centre for Environmental Research, Permoserstraße 15, 04318 Leipzig, Germany
- Institute for Geological Sciences, Friedrich-Schiller-University Jena, Burgweg 11, 07749 Jena, Germany
| | - Sara Marañón-Jiménez
- Department Computational Hydrosystems, UFZ-Helmholtz Centre for Environmental Research, Permoserstraße 15, 04318 Leipzig, Germany
- Institute for Geological Sciences, Friedrich-Schiller-University Jena, Burgweg 11, 07749 Jena, Germany
- Department of Applied Physics, University of Granada, Av. Fuentenueva s/n, E-18071 Granada, Spain
| | - Corinna Rebmann
- Department Computational Hydrosystems, UFZ-Helmholtz Centre for Environmental Research, Permoserstraße 15, 04318 Leipzig, Germany
| | - Mathias Herbst
- Thünen Institute of Climate Smart Agriculture, Bundesallee 50, 38116 Braunschweig, Germany
| | - Matthias Cuntz
- Department Computational Hydrosystems, UFZ-Helmholtz Centre for Environmental Research, Permoserstraße 15, 04318 Leipzig, Germany
| |
Collapse
|
50
|
Loblolly Pine Productivity and Water Relations in Response to Throughfall Reduction and Fertilizer Application on a Poorly Drained Site in Northern Florida. FORESTS 2016. [DOI: 10.3390/f7100214] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|