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Dreyling L, Boch S, Lumbsch HT, Schmitt I. Surveying lichen diversity in forests: A comparison of expert mapping and eDNA metabarcoding of bark surfaces. MycoKeys 2024; 106:153-172. [PMID: 38948916 PMCID: PMC11214015 DOI: 10.3897/mycokeys.106.117540] [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: 12/18/2023] [Accepted: 05/10/2024] [Indexed: 07/02/2024] Open
Abstract
Lichens are an important part of forest ecosystems, contributing to forest biodiversity, the formation of micro-niches and nutrient cycling. Assessing the diversity of lichenised fungi in complex ecosystems, such as forests, requires time and substantial skills in collecting and identifying lichens. The completeness of inventories thus largely depends on the expertise of the collector, time available for the survey and size of the studied area. Molecular methods of surveying biodiversity hold the promise to overcome these challenges. DNA barcoding of individual lichen specimens and bulk collections is already being applied; however, eDNA methods have not yet been evaluated as a tool for lichen surveys. Here, we assess which species of lichenised fungi can be detected in eDNA swabbed from bark surfaces of living trees in central European forests. We compare our findings to an expert floristic survey carried out in the same plots about a decade earlier. In total, we studied 150 plots located in three study regions across Germany. In each plot, we took one composite sample based on six trees, belonging to the species Fagussylvatica, Piceaabies and Pinussylvestris. The eDNA method yielded 123 species, the floristic survey 87. The total number of species found with both methods was 167, of which 48% were detected only in eDNA, 26% only in the floristic survey and 26% in both methods. The eDNA contained a higher diversity of inconspicuous species. Many prevalent taxa reported in the floristic survey could not be found in the eDNA due to gaps in molecular reference databases. We conclude that, currently, eDNA has merit as a complementary tool to monitor lichen biodiversity at large scales, but cannot be used on its own. We advocate for the further development of specialised and more complete databases.
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Affiliation(s)
- Lukas Dreyling
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt am Main, GermanySenckenberg Biodiversity and Climate Research Centre (SBiK-F)Frankfurt am MainGermany
- Goethe University Frankfurt, Institute of Ecology, Evolution and Diversity, Frankfurt am Main, GermanyGoethe University FrankfurtFrankfurt am MainGermany
| | - Steffen Boch
- WSL Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, SwitzerlandWSL Swiss Federal Institute for Forest, Snow and Landscape ResearchBirmensdorfSwitzerland
| | - H. Thorsten Lumbsch
- Collections, Conservation, and Research, The Field Museum, Chicago, IL 60605-2496, USAThe Field MuseumChicagoUnited States of America
| | - Imke Schmitt
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt am Main, GermanySenckenberg Biodiversity and Climate Research Centre (SBiK-F)Frankfurt am MainGermany
- Goethe University Frankfurt, Institute of Ecology, Evolution and Diversity, Frankfurt am Main, GermanyGoethe University FrankfurtFrankfurt am MainGermany
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2
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Driscoll C, Milford JB, Henze DK, Bell MD. Atmospheric reduced nitrogen: Sources, transformations, effects, and management. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION (1995) 2024; 74:362-415. [PMID: 38819428 DOI: 10.1080/10962247.2024.2342765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 04/02/2024] [Indexed: 06/01/2024]
Abstract
Human activities have increased atmospheric emissions and deposition of oxidized and reduced forms of nitrogen, but emission control programs have largely focused on oxidized nitrogen. As a result, in many regions of the world emissions of oxidized nitrogen are decreasing while emissions of reduced nitrogen are increasing. Emissions of reduced nitrogen largely originate from livestock waste and fertilizer application, with contributions from transportation sources in urban areas. Observations suggest a discrepancy between trends in emissions and deposition of reduced nitrogen in the U.S., likely due to an underestimate in emissions. In the atmosphere, ammonia reacts with oxides of sulfur and nitrogen to form fine particulate matter that impairs health and visibility and affects climate forcings. Recent reductions in emissions of sulfur and nitrogen oxides have limited partitioning with ammonia, decreasing long-range transport. Continuing research is needed to improve understanding of how shifting emissions alter formation of secondary particulates and patterns of transport and deposition of reactive nitrogen. Satellite remote sensing has potential for monitoring atmospheric concentrations and emissions of ammonia, but there remains a need to maintain and strengthen ground-based measurements and continue development of chemical transport models. Elevated nitrogen deposition has decreased plant and soil microbial biodiversity and altered the biogeochemical function of terrestrial, freshwater, and coastal ecosystems. Further study is needed on differential effects of oxidized versus reduced nitrogen and pathways and timescales of ecosystem recovery from elevated nitrogen deposition. Decreases in deposition of reduced nitrogen could alleviate exceedances of critical loads for terrestrial and freshwater indicators in many U.S. areas. The U.S. Environmental Protection Agency should consider using critical loads as a basis for setting standards to protect public welfare and ecosystems. The U.S. and other countries might look to European experience for approaches to control emissions of reduced nitrogen from agricultural and transportation sectors.Implications: In this Critical Review we synthesize research on effects, air emissions, environmental transformations, and management of reduced forms of nitrogen. Emissions of reduced nitrogen affect human health, the structure and function of ecosystems, and climatic forcings. While emissions of oxidized forms of nitrogen are regulated in the U.S., controls on reduced forms are largely absent. Decreases in emissions of sulfur and nitrogen oxides coupled with increases in ammonia are shifting the gas-particle partitioning of ammonia and decreasing long-range atmospheric transport of reduced nitrogen. Effort is needed to understand, monitor, and manage emissions of reduced nitrogen in a changing environment.
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Affiliation(s)
- Charles Driscoll
- Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, USA
| | - Jana B Milford
- Department of Mechanical Engineering, University of Colorado, Boulder, CO, USA
| | - Daven K Henze
- Department of Mechanical Engineering, University of Colorado, Boulder, CO, USA
| | - Michael D Bell
- Ecologist, National Park Service - Air Resources Division, Boulder, CO, USA
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3
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Phelan JN, Van Houtven G, Clark CM, Buckley J, Cajka J, Hargrave A, Horn K, Thomas RQ, Sabo RD. Climate change could negate U.S. forest ecosystem service benefits gained through reductions in nitrogen and sulfur deposition. Sci Rep 2024; 14:10767. [PMID: 38730011 PMCID: PMC11087459 DOI: 10.1038/s41598-024-60652-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 04/25/2024] [Indexed: 05/12/2024] Open
Abstract
Climate change and atmospheric deposition of nitrogen (N) and sulfur (S) impact the health and productivity of forests. Here, we explored the potential impacts of these environmental stressors on ecosystem services provided by future forests in the contiguous U.S. We found that all stand-level services benefitted (+ 2.6 to 8.1%) from reductions in N+S deposition, largely attributable to positive responses to reduced S that offset the net negative effects of lower N levels. Sawtimber responded positively (+ 0.5 to 0.6%) to some climate change, but negatively (- 2.4 to - 3.8%) to the most extreme scenarios. Aboveground carbon (C) sequestration and forest diversity were negatively impacted by all modelled changes in climate. Notably, the most extreme climate scenario eliminated gains in all three services achieved through reduced deposition. As individual tree species responded differently to climate change and atmospheric deposition, associated services unique to each species increased or decreased under future scenarios. Our results suggest that climate change should be considered when evaluating the benefits of N and S air pollution policies on the services provided by U.S. forests.
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Affiliation(s)
| | | | - Christopher M Clark
- U.S. Environmental Protection Agency, Office of Research and Development, Washington, DC, USA
| | - John Buckley
- RTI International, 3040 E. Cornwallis Rd., RTP, NC, USA
| | - James Cajka
- RTI International, 3040 E. Cornwallis Rd., RTP, NC, USA
| | - Ashton Hargrave
- U.S. Department of Agriculture, Forest Service, National Forest System Washington Office, Fort Collins, CO, USA
| | - Kevin Horn
- Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute, Blacksburg, VA, USA
| | - R Quinn Thomas
- Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute, Blacksburg, VA, USA
- Department of Biological Sciences, Virginia Polytechnic Institute, Blacksburg, VA, USA
| | - Robert D Sabo
- U.S. Environmental Protection Agency, Office of Research and Development, Washington, DC, USA
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4
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Yuan J, Peng M, Tang G, Wang Y. Fine root production, mortality, and turnover in response to simulated nitrogen deposition in the subtropical Abies georgei (Orr) forest. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 923:171404. [PMID: 38432381 DOI: 10.1016/j.scitotenv.2024.171404] [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: 08/30/2023] [Revised: 02/28/2024] [Accepted: 02/29/2024] [Indexed: 03/05/2024]
Abstract
Increased nitrogen deposition has important effects on below-ground ecological processes. Fine roots are the most active part of the root system in terms of physiological activity and the main organs for nutrient and water uptake by plants. However, there is still a limited understanding of how nitrogen deposition affects the fine root dynamics in subtropical Abies georgei (Orr) forests. Consequently, a three-year field experiment was conducted to quantify the effects of three forms of nitrogen sources ((NH4)2SO4, NaNO3, and NH4NO3) at four levels (0, 5, 15, and 30 kg N·ha-1·yr-1) on the fine root dynamics in Abies georgei forests using a randomized block-group experimental design and minirhizotron technique. The first year of nitrogen addition did not affect the first-class fine roots (FR1, 0 < diameter < 0.5 mm) and second-class fine roots (FR2, 0.5 < diameter < 1.0 mm). The next two years of nitrogen addition significantly increased the production, mortality, and turnover of FR1 and FR2; the three year of nitrogen addition did not affect the dynamics of the third- class fine roots (FR3, 1.0 < diameter < 1.5 mm) and fourth- class fine roots (FR4,1.5 < diameter < 2.0 mm). Nitrogen addition positively affected the dynamics of FR1, FR2, FR3 and FR4 by positively affecting the carbon, nitrogen, and phosphorus contents of fine roots and indirectly affecting the soil pH. Increased carbon allocation to FR1 and FR2 may represent a phosphorus acquisition strategy when nitrogen is not the limiting factor. The nitrogen addition forms and levels affected the fine root dynamics in the following orde: NH4NO3 > (NH4)2SO4 > NaNO3 and high nitrogen > medium nitrogen > low nitrogen. The results suggest that the different-diameter fine root dynamics respond differently to different nitrogen addition forms and levels, and linking the different-diameter fine roots to nitrogen deposition is crucial.
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Affiliation(s)
- Jiyou Yuan
- School of Ecology and Environmental Sciences & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming, Yunnan 650091, China.
| | - Mingchun Peng
- School of Ecology and Environmental Sciences & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming, Yunnan 650091, China.
| | - Guoyong Tang
- Institute of Highland Forest Science, Chinese Academy of Forestry, Kunming 650233, China.
| | - Yun Wang
- Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, Linyi 276000, China.
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Clark CM, Phelan J, Ash J, Buckley J, Cajka J, Horn K, Thomas RQ, Sabo RD. Future climate change effects on US forest composition may offset benefits of reduced atmospheric deposition of N and S. GLOBAL CHANGE BIOLOGY 2023; 29:4793-4810. [PMID: 37417247 PMCID: PMC11166206 DOI: 10.1111/gcb.16817] [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: 12/09/2022] [Accepted: 04/26/2023] [Indexed: 07/08/2023]
Abstract
Climate change and atmospheric deposition of nitrogen (N) and sulfur (S) are important drivers of forest demography. Here we apply previously derived growth and survival responses for 94 tree species, representing >90% of the contiguous US forest basal area, to project how changes in mean annual temperature, precipitation, and N and S deposition from 20 different future scenarios may affect forest composition to 2100. We find that under the low climate change scenario (RCP 4.5), reductions in aboveground tree biomass from higher temperatures are roughly offset by increases in aboveground tree biomass from reductions in N and S deposition. However, under the higher climate change scenario (RCP 8.5) the decreases from climate change overwhelm increases from reductions in N and S deposition. These broad trends underlie wide variation among species. We found averaged across temperature scenarios the relative abundance of 60 species were projected to decrease more than 5% and 20 species were projected to increase more than 5%; and reductions of N and S deposition led to a decrease for 13 species and an increase for 40 species. This suggests large shifts in the composition of US forests in the future. Negative climate effects were mostly from elevated temperature and were not offset by scenarios with wetter conditions. We found that by 2100 an estimated 1 billion trees under the RCP 4.5 scenario and 20 billion trees under the RCP 8.5 scenario may be pushed outside the temperature record upon which these relationships were derived. These results may not fully capture future changes in forest composition as several other factors were not included. Overall efforts to reduce atmospheric deposition of N and S will likely be insufficient to overcome climate change impacts on forest demography across much of the United States unless we adhere to the low climate change scenario.
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Affiliation(s)
- Christopher M. Clark
- US Environmental Protection Agency, Office of Research and Development, Center for Public Health and Environmental Assessment, Washington DC
| | | | - Jeremy Ash
- US Department of Agriculture, US Forest Service, Region 8, Ashville, NC
| | | | - James Cajka
- RTI International, Research Triangle Park, NC
| | - Kevin Horn
- Virginia Polytechnical University, Department of Forest Resources and Environmental Conservation, Blacksburg, VA
| | - R. Quinn Thomas
- Virginia Polytechnical University, Department of Forest Resources and Environmental Conservation, Blacksburg, VA
| | - Robert D. Sabo
- US Environmental Protection Agency, Office of Research and Development, Center for Public Health and Environmental Assessment, Washington DC
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6
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Manninen S, Jääskeläinen K, Stephens A, Iwanicka A, Tang S, van Dijk N. NH 3 concentrations below the current critical level affect the epiphytic macrolichen communities - Evidence from a Northern European City. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 877:162877. [PMID: 36933738 DOI: 10.1016/j.scitotenv.2023.162877] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 03/08/2023] [Accepted: 03/11/2023] [Indexed: 05/06/2023]
Abstract
Acidophytic, oligotrophic lichens on tree trunks are widely considered to be the most sensitive biota to elevated concentrations of atmospheric ammonia (NH3). We studied the relationships between measured NH3 concentrations and the composition of macrolichen communities on the acidic bark of Pinus sylvestris and Quercus robur and the base-rich bark of Acer platanoides and Ulmus glabra at ten roadside and ten non-roadside sites in Helsinki, Finland. NH3 and nitrogen dioxide (NO2) concentrations were higher at the roadside than non-roadside sites indicating traffic as the main source of NH3 and nitrogen oxides (NOx). The diversity of oligotrophs on Quercus was lower at the roadside than non-roadside sites, while that of eutrophs was higher. The abundance and presence of oligotrophic acidophytes (e.g., Hypogymnia physodes) decreased with increasing NH3 concentration (2-year means = 0.15-1.03 μg m-3) especially on Q. robur, while those of eutrophic/nitrophilous species (e.g., Melanohalea exasperatula, Physcia tenella) increased. The abundance of some nitrophytes seemed to depend only on bark pH, i.e., their abundances were highest on Ulmus, which had the highest average bark pH. Overall, the results of lichen bioindicator studies may depend on tree species (bark pH) and lichen species used in calculating indices describing the air quality impact. Nevertheless, Quercus is recommended to be used to study the impact of NH3 alone and in combination with NOx on lichen communities, because the responses of both oligotrophic acidophytes and eutrophic species can already be observed at NH3 concentrations below the current critical level.
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Affiliation(s)
- Sirkku Manninen
- Faculty of Biological and Environmental Sciences, P.O. Box 65 (Viikinkaari 1), FI-00014, University of Helsinki, Finland.
| | - Kimmo Jääskeläinen
- Kuopio Museum of Natural History, Myhkyrinkatu 22, FI-70100 Kuopio, Finland
| | - Amy Stephens
- UK Centre for Ecology & Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK
| | - Agata Iwanicka
- UK Centre for Ecology & Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK
| | - Sim Tang
- UK Centre for Ecology & Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK
| | - Netty van Dijk
- UK Centre for Ecology & Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK
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Lõhmus A, Motiejūnaitė J, Lõhmus P. Regionally Varying Habitat Relationships in Lichens: The Concept and Evidence with an Emphasis on North-Temperate Ecosystems. J Fungi (Basel) 2023; 9:jof9030341. [PMID: 36983509 PMCID: PMC10056719 DOI: 10.3390/jof9030341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 03/07/2023] [Accepted: 03/08/2023] [Indexed: 03/14/2023] Open
Abstract
Habitat ecology of lichens (lichen-forming fungi) involves diverse adaptations to stressful environments where lichens use specific habitat conditions. Field observations confirm that such habitat ‘preferences’ can vary significantly across species’ distribution ranges, sometimes revealing abrupt changes over short distances. We critically review and generalize such empirical evidence as broad ecological patterns, link these with the likely physiological mechanisms and evolutionary processes involved, and outline the implications for lichen conservation. Non-replicated correlative studies remain only suggestive because the data are frequently compromised by sampling bias and pervasive random errors; further noise is related to unrecognized cryptic species. Replicated evidence exists for three macroecological patterns: (a) regional limiting factors excluding a species from a part of its microhabitat range in suboptimal areas; (b) microhabitat shifts to buffer regionally adverse macroclimates; (c) substrate suitability changed by the chemical environment, notably air pollution. All these appear to be primarily buffering physiological challenges of the adverse conditions at the macrohabitat scale or, in favorable environments, coping with competition or predation. The roles of plasticity, adaptation, dispersal, and population-level stochasticity remain to be studied. Although lichens can inhabit various novel microhabitats, there is no evidence for a related adaptive change. A precautionary approach to lichen conservation is to maintain long-term structural heterogeneity in lichen habitats, and consider lichen ecotypes as potential evolutionarily significant units and a bet-hedging strategy for addressing the climate change-related challenges to biodiversity.
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Affiliation(s)
- Asko Lõhmus
- Institute of Ecology and Earth Sciences, University of Tartu, J. Liivi 2, 50409 Tartu, Estonia
- Correspondence:
| | - Jurga Motiejūnaitė
- Laboratory of Mycology, Institute of Botany, Nature Research Centre, Žaliųjų Ežerų 49, LT-08406 Vilnius, Lithuania
| | - Piret Lõhmus
- Institute of Ecology and Earth Sciences, University of Tartu, J. Liivi 2, 50409 Tartu, Estonia
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8
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Morphological and physiological responses of critically endangered Acer catalpifolium to nitrogen deposition levels. Glob Ecol Conserv 2023. [DOI: 10.1016/j.gecco.2023.e02431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023] Open
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9
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Ecological Risks from Atmospheric Deposition of Nitrogen and Sulphur in Jack Pine forests of Northwestern Canada. NITROGEN 2023. [DOI: 10.3390/nitrogen4010008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023] Open
Abstract
Chronic elevated nitrogen (N) deposition can have adverse effects on terrestrial ecosystems. For large areas of northern Canada distant from emissions sources, long-range atmospheric transport of N may impact plant species diversity, even at low deposition levels. The objective of this study was to establish plant species community thresholds for N deposition under multiple environmental gradients using gradient forest analysis. Plant species abundance data for 297 Jack pine (Pinus banksiana Lamb.)-dominant forest plots across Alberta and Saskatchewan, Canada, were evaluated against 43 bioclimatic and deposition variables. Bioclimatic variables were overwhelmingly the most important drivers of community thresholds. Nonetheless, dry N oxide (DNO) and dry N dioxide deposition inferred a total deposited N (TDN) community threshold of 1.4–2.1 kg N ha−1 yr−1. This range was predominantly associated with changes in several lichen species, including Cladina mitis, Vulpicida pinastri, Evernia mesomorpha and Lecanora circumborealis, some of which are known bioindicators of N deposition. A secondary DNO threshold appeared to be driving changes in several vascular species and was equivalent to 2.45–3.15 kg N ha−1 yr−1 on the TDN gradient. These results suggest that in low deposition ‘background’ regions a biodiversity-based empirical critical load of 1.4–3.15 kg N ha−1 yr−1 will protect lichen communities and other N-sensitive species in Jack pine forests across Northwestern Canada. Nitrogen deposition above the critical load may lead to adverse effects on plant species biodiversity within these forests.
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Clark CM, Thomas RQ, Horn KJ. Above-ground tree carbon storage in response to nitrogen deposition in the U.S. is heterogeneous and may have weakened. COMMUNICATIONS EARTH & ENVIRONMENT 2023; 4:1-8. [PMID: 37325084 PMCID: PMC10262689 DOI: 10.1038/s43247-023-00677-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 01/06/2023] [Indexed: 06/17/2023]
Abstract
Changes in nitrogen (N) availability affect the ability for forest ecosystems to store carbon (C). Here we extend an analysis of the growth and survival of 94 tree species and 1.2 million trees, to estimate the incremental effects of N deposition on changes in aboveground C (dC/dN) across the contiguous U.S. (CONUS). We find that although the average effect of N deposition on aboveground C is positive for the CONUS (dC/dN=+9 kg C per kg N), there is wide variation among species and regions. Furthermore, in the Northeastern U.S. where we may compare responses from 2000-2016 with those from the 1980s-90s, we find the recent estimate of dC/dN is weaker than from the 1980s-90s due to species-level changes in responses to N deposition. This suggests that the U.S. forest C-sink varies widely across forests and may be weakening overall, possibly necessitating more aggressive climate policies than originally thought.
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Affiliation(s)
- Christopher M. Clark
- U.S. Environmental Protection Agency, Office of Research and Development, Washington, DC, USA
| | - R. Quinn Thomas
- Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, VA, USA
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA, USA
| | - Kevin J. Horn
- Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, VA, USA
- Present address: Freedom Consulting Group, 7061 Columbia Gateway Drive, Columbia, MD, USA
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11
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Greaver T, McDow S, Phelan J, Kaylor SD, Herrick JD, Jovan S. Synthesis of lichen response to gaseous nitrogen: ammonia versus nitrogen dioxide. ATMOSPHERIC ENVIRONMENT (OXFORD, ENGLAND : 1994) 2023; 292:1-13. [PMID: 37475978 PMCID: PMC10355123 DOI: 10.1016/j.atmosenv.2022.119396] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/22/2023]
Abstract
The dominant chemical form of nitrogen pollution in the atmosphere in the U.S. is shifting from oxidized nitrogen, primarily from combustion of fossil fuels, to reduced nitrogen from agricultural animal waste and fertilizer applications. Does it matter to lichens? In this synthesis, we characterize U.S. air concentrations of the most ubiquitous gaseous forms of reduced and oxidized nitrogen, NO2 and NH3, respectively, and their direct effects on lichens. In the U.S., the 3-year average (2017-2019) of the annual mean for each monitoring site ranges up to 56.4 μg NO2 m-3 (~30 ppb) and 6 μg NH3 m-3 (~9 ppb). The spatial coverage of current routine monitoring of NO2 and NH3 likely does not accurately represent exposures of NO2 to ecosystems in rural areas or capture spikes of NH3 concentrations proximal to intensive agriculture, which are documented to exceed 700 μg NH3 m-3 (~1000 ppb) for short durations. Both NO2 and NH3 can act as nutrients to lichens, but as exposures rise, both can cause physiological stress and mortality that then change community composition and diversity. There is a growing body of evidence that lichen community composition is altered at current levels of exposure in the U.S. with estimated no effect or lowest effect concentrations from <1-3 μg m-3 NO2 and <1 μg m-3 NH3. Better spatial characterization of both NO2 and NH3 concentrations, especially near intensive agriculture, would help to characterize the extent of the impacts across the U.S. These findings are discussed in the context of U.S. air pollution policy.
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Affiliation(s)
- Tara Greaver
- Center for Public Health and Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711
| | - Stephen McDow
- Center for Public Health and Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711
| | | | - S. Douglas Kaylor
- Center for Public Health and Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711
| | - Jeffrey D. Herrick
- Center for Public Health and Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711
| | - Sarah Jovan
- USDA Forest Service, PNW Research Station, 620 SW Main, Suite 502, Portland, OR 97205, USA
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12
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Embracing Uncertainty and Probabilistic Outcomes for Ecological Critical Loads. Ecosystems 2022. [DOI: 10.1007/s10021-022-00774-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Teglia A, Di Baccio D, Matteucci G, Scartazza A, De Cinti B, Mazzenga F, Ravaioli D, Muzzi E, Marcolini G, Magnani F. Effects of simulated nitrogen deposition on the nutritional and physiological status of beech forests at two climatic contrasting sites in Italy. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 834:155362. [PMID: 35460784 DOI: 10.1016/j.scitotenv.2022.155362] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 03/31/2022] [Accepted: 04/14/2022] [Indexed: 06/14/2023]
Abstract
Anthropogenic activities have resulted in a significant increase of reactive nitrogen (N) compounds in the atmosphere and a rise in N deposition on forest ecosystems. Increasing N loads impact forest productivity and health, altering tree physiological status and nutrient balance with possible beneficial and detrimental consequences. The impact of N deposition has received considerable attention by scientific research, covering medium and high latitudes, while experimental studies in the Mediterranean area are almost absent. The present study used a manipulative approach, through replicated N additions (background deposition, 30, 60 kg N ha-1yr-1) to simulate the cumulative effects of N deposition in two beech (Fagus sylvaticaL.) forests located in contrasting climatic regions of Italy. Leaf nutrients and photosynthetic pigments were tested as monitoring indicators after four years of N fertilization. Foliar N and pigment concentrations indicated not limiting N conditions at both forest sites, although changes in chlorophylls and carotenoids showed an early response of the canopy to N additions. N-to-phosphorus (P) and sulfur (S) ratios increased under elevated N fertilization, which could be partly related to the relative enhancement of foliar N concentration, and partly associated with the reduction of foliar P and S. The two eutrophic beech forests monitored were not severely affected by chronic N addition, not showing critical nutritional and physiological impairments over the short to medium period. However, the modifications in leaf nutrient and pigment compositions showed an incipient stress response and accentuated the differences induced by climatic and soil characteristics at the two sites. The potential use of nutrients and photosynthetic pigments in monitoring forest N deposition under contrasting climatic conditions and the eventual limits of manipulative experiments are discussed.
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Affiliation(s)
- Alessandra Teglia
- Department of Agricultural and Food Sciences, University of Bologna, Viale Fanin 44, Bologna, Italy.
| | - Daniela Di Baccio
- National Research Council of Italy, Research Institute on Terrestrial Ecosystems (CNR-IRET), Via Giuseppe Moruzzi 1, Pisa, Italy
| | - Giorgio Matteucci
- National Research Council of Italy, Institute of BioEconomy (CNR-IBE), Via Madonna del Piano, 10, 50019 Sesto Fiorentino, FI, Italy
| | - Andrea Scartazza
- National Research Council of Italy, Research Institute on Terrestrial Ecosystems (CNR-IRET), Via Giuseppe Moruzzi 1, Pisa, Italy
| | - Bruno De Cinti
- National Research Council of Italy, Institute for Terrestrial Ecosystems (CNR-IRET), Via Salaria km 29,300, Montelibretti, RM, Italy
| | - Francesco Mazzenga
- National Research Council of Italy, Institute of BioEconomy (CNR-IBE), via dei Taurini 19, 00185, Rome
| | - Dario Ravaioli
- Department of Agricultural and Food Sciences, University of Bologna, Viale Fanin 44, Bologna, Italy
| | - Enrico Muzzi
- Department of Agricultural and Food Sciences, University of Bologna, Viale Fanin 44, Bologna, Italy
| | - Graziella Marcolini
- Department of Agricultural and Food Sciences, University of Bologna, Viale Fanin 44, Bologna, Italy
| | - Federico Magnani
- Department of Agricultural and Food Sciences, University of Bologna, Viale Fanin 44, Bologna, Italy
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14
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Esseen P, Ekström M, Grafström A, Jonsson BG, Palmqvist K, Westerlund B, Ståhl G. Multiple drivers of large-scale lichen decline in boreal forest canopies. GLOBAL CHANGE BIOLOGY 2022; 28:3293-3309. [PMID: 35156274 PMCID: PMC9310866 DOI: 10.1111/gcb.16128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 01/14/2022] [Indexed: 06/14/2023]
Abstract
Thin, hair-like lichens (Alectoria, Bryoria, Usnea) form conspicuous epiphyte communities across the boreal biome. These poikilohydric organisms provide important ecosystem functions and are useful indicators of global change. We analyse how environmental drivers influence changes in occurrence and length of these lichens on Norway spruce (Picea abies) over 10 years in managed forests in Sweden using data from >6000 trees. Alectoria and Usnea showed strong declines in southern-central regions, whereas Bryoria declined in northern regions. Overall, relative loss rates across the country ranged from 1.7% per year in Alectoria to 0.5% in Bryoria. These losses contrasted with increased length of Bryoria and Usnea in some regions. Occurrence trajectories (extinction, colonization, presence, absence) on remeasured trees correlated best with temperature, rain, nitrogen deposition, and stand age in multinomial logistic regression models. Our analysis strongly suggests that industrial forestry, in combination with nitrogen, is the main driver of lichen declines. Logging of forests with long continuity of tree cover, short rotation cycles, substrate limitation and low light in dense forests are harmful for lichens. Nitrogen deposition has decreased but is apparently still sufficiently high to prevent recovery. Warming correlated with occurrence trajectories of Alectoria and Bryoria, likely by altering hydration regimes and increasing respiration during autumn/winter. The large-scale lichen decline on an important host has cascading effects on biodiversity and function of boreal forest canopies. Forest management must apply a broad spectrum of methods, including uneven-aged continuous cover forestry and retention of large patches, to secure the ecosystem functions of these important canopy components under future climates. Our findings highlight interactions among drivers of lichen decline (forestry, nitrogen, climate), functional traits (dispersal, lichen colour, sensitivity to nitrogen, water storage), and population processes (extinction/colonization).
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Affiliation(s)
- Per‐Anders Esseen
- Department of Ecology and Environmental ScienceUmeå UniversityUmeåSweden
| | - Magnus Ekström
- Department of Statistics, USBEUmeå UniversityUmeåSweden
- Department of Forest Resource ManagementSwedish University of Agricultural SciencesUmeåSweden
| | - Anton Grafström
- Department of Forest Resource ManagementSwedish University of Agricultural SciencesUmeåSweden
| | - Bengt Gunnar Jonsson
- Department of Natural SciencesMid Sweden UniversitySundsvallSweden
- Department of Fish, Wildlife and Environmental SciencesSwedish University of Agricultural SciencesUmeåSweden
| | - Kristin Palmqvist
- Department of Ecology and Environmental ScienceUmeå UniversityUmeåSweden
| | - Bertil Westerlund
- Department of Forest Resource ManagementSwedish University of Agricultural SciencesUmeåSweden
| | - Göran Ståhl
- Department of Forest Resource ManagementSwedish University of Agricultural SciencesUmeåSweden
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15
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Adomako MO, Xue W, Du DL, Yu FH. Soil Microbe-Mediated N:P Stoichiometric Effects on Solidago canadensis Performance Depend on Nutrient Levels. MICROBIAL ECOLOGY 2022; 83:960-970. [PMID: 34279696 DOI: 10.1007/s00248-021-01814-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Accepted: 07/01/2021] [Indexed: 06/13/2023]
Abstract
Both soil microbes and soil N:P ratios can affect plant growth, but it is unclear whether they can interact to alter plant growth and whether such an interactive effect depends on nutrient levels. Here, we tested the hypothesis that soil microbes can ameliorate the negative effects of nutrient imbalance caused by low or high N:P ratios on plant growth and that such an ameliorative effect of soil microbes depends on nutrient supply levels. We grew individuals of six populations of the clonal plant Solidago canadensis at three N:P ratios (low (1.7), intermediate (15), and high (135)), under two nutrient levels (low versus high) and in the presence versus absence of soil microbes. The presence of soil microbes significantly increased biomass of S. canadensis at all three N:P ratios and under both nutrient levels. Under the low-nutrient level, biomass, height, and leaf number of S. canadensis did not differ significantly among the three N:P ratio treatments in the absence of soil microbes, but they were higher at the high than at the low and the intermediate N:P ratio in the presence of soil microbes. Under the high-nutrient level, by contrast, biomass, height, and leaf number of S. canadensis were significantly higher at the low than at the high and the intermediate N:P ratio in the absence of soil microbes, but increased with increasing the N:P ratio in the presence of soil microbes. In the presence of soil microbes, number of ramets (asexual individuals) and the accumulation of N and P in plants were significantly higher at the high than at the low and the intermediate N:P ratio under both nutrient levels, whereas in the absence of soil microbes, they did not differ significantly among the three N:P ratio regardless of the nutrient levels. Our results provide empirical evidence that soil microbes can alter effects of N:P ratios on plant performance and that such an effect depends on nutrient availability. Soil microbes may, therefore, play a role in modulating ecosystem functions such as productivity and carbon and nutrient cycling via modulating nutrient imbalance caused by low and high N:P ratios.
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Affiliation(s)
- Michael Opoku Adomako
- Institute of Wetland Ecology & Clone Ecology/Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, 318000, China
- Institute of Environment and Ecology, Academy of Environmental Health and Ecological Security, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, China
| | - Wei Xue
- Institute of Wetland Ecology & Clone Ecology/Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, 318000, China
| | - Dao-Lin Du
- Institute of Environment and Ecology, Academy of Environmental Health and Ecological Security, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, China
| | - Fei-Hai Yu
- Institute of Wetland Ecology & Clone Ecology/Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, 318000, China.
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16
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Geiser LH, Root H, Smith RJ, Jovan SE, St Clair L, Dillman KL. Lichen-based critical loads for deposition of nitrogen and sulfur in US forests. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 291:118187. [PMID: 34563846 DOI: 10.1016/j.envpol.2021.118187] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 09/08/2021] [Accepted: 09/14/2021] [Indexed: 06/13/2023]
Abstract
Critical loads are thresholds of atmospheric deposition below which harmful ecological effects do not occur. Because lichens are sensitive to atmospheric deposition, lichen-based critical loads can foreshadow changes of other forest processes. Here, we derive critical loads of nitrogen (N) and sulfur (S) deposition for continental US and coastal Alaskan forests, based on nationally consistent lichen community surveys at 8855 sites. Across the eastern and western US ranges of 459 lichen species, each species' realized optimum was the N or S atmospheric deposition value at which it most frequently occurred. The mean of optima for all species at a site, weighted by their abundances, was defined as a community "airscore" indicative of species' collective responses to atmospheric deposition. To determine critical loads for adverse community compositional shifts, we then modeled changes in airscores as a function of deposition, climate and forest habitat predictors in nonparametric multiplicative regression. Critical loads, indicative of initial shifts from pollution-sensitive toward pollution-tolerant species, occurred at 1.5 kg N ha-1 y-1 and 2.7 kg S ha-1 y-1. Importantly, these critical loads remain constant under any climate regime nationwide, suggesting both simplicity and nationwide applicability. Our models predict that preventing excess N deposition of just 0.2-2.0 kg ha-1 y-1 in the next century could offset the detrimental effects of predicted climate warming on lichen communities. Because excess deposition and climate warming both harm the most ecologically influential species, keeping conditions below critical loads would sustain both forest ecosystem functioning and climate resilience.
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Affiliation(s)
- Linda H Geiser
- USDA Forest Service, Biological and Physical Resources, Washington, DC, USA
| | | | - Robert J Smith
- USDA Forest Service, Biological and Physical Resources, Washington, DC, USA.
| | - Sarah E Jovan
- USDA Forest Service, Pacific Northwest Research Station, Portland, OR, USA
| | - Larry St Clair
- M.L. Bean Life Science Museum and Department of Biology, Brigham Young University, Provo, UT, USA
| | - Karen L Dillman
- USDA Forest Service, Biological and Physical Resources, Washington, DC, USA
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17
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da Silva BF, Pereira IMC, de Melo JC, Martins MCB, Barbosa MO, Silva AKO, de Siqueira WN, da Silva NH, de Oliveira AFM, Vicente C, Legaz ME, Pereira EC. Cladonia verticillaris (lichen) indicates negative impacts derived from the combustion of biodiesel blends: an alert for the environmental management for biofuels use. ENVIRONMENTAL MONITORING AND ASSESSMENT 2021; 193:809. [PMID: 34783906 DOI: 10.1007/s10661-021-09610-0] [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: 03/11/2021] [Accepted: 11/05/2021] [Indexed: 06/13/2023]
Abstract
The use of biodiesel blends with petroleum diesel in vehicular engines demands the evaluation of the possible impacts and effects of the gases emitted from their combustion on the environment. Among studies on these questions, biomonitoring using lichens is a viable alternative, given their interactions with the elements dispersed in the atmosphere, as well as its sensitivity and capacity to retain contaminants. In this study, we analyzed the effects of gas emissions from the combustion of biodiesel mixture with petroleum diesel on Cladonia verticillaris thalli. Samples of the lichen (10 g) were exposed to the gases emitted by the exhaust of the generator engine during the combustion process of biodiesel mixtures to petroleum diesel (7% (B7), 10% (B10), 40% (B40), 50% (B50), and 70% (B70)). At 90 days after exposure, samples were analyzed for n-alkane profiles, thallus morphology, photosynthetic pigment contents, and secondary lichen metabolites (protocetraric and fumarprotocetraric acids). Sets B7 and B10 showed better resistance of the lichen to pollutants. Set B40 showed a high stress evidenced by the chain elongation of n-alkanes structure and high chlorophyll production, presenting high morphological damages when compared to the control sets, B7 and B10. The results showed significant reductions of n-alkanes profiles for mixtures with high concentrations of biodiesel (B50 and B70), as well as decreases in the chlorophyll content. These groups showed an increase in the synthesis of secondary metabolites, corroborating the hypothesis that high concentrations of biodiesel in the mixture with petroleum diesel have greater impacts on the lichen. Schematic model for demonstration of using the lichen Cladonia verticillaris as biomonitor of effects from gas emissions from the combustion of biodiesel blends with petroleum diesel by a stationary engine.
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Affiliation(s)
- Bruno F da Silva
- Post-Graduate Program in Applied Ecology, Center of Nuclear Energy in Agriculture, Universidade de São Paulo, Av. São Dimas, 303, 13.416-000, Piracicaba, São Paulo, Brazil
| | - Iwelton M C Pereira
- Collegiate of the Geography Degree Course, Universidade de Pernambuco, R. Cap. Pedro Rodrigues, 55.294-902, Garanhuns, Pernambuco, Brazil
| | - James C de Melo
- Biofuels Division, Northeast Strategic Technologies Center (CETENE), Av. Prof. Luís Freire, 1, 50.740-545, Recife, Pernambuco, Brazil
| | - Mônica C B Martins
- Post-Graduate Program in Plant Biology, Department of Botany, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, 50.670-901, Recife, Pernambuco, Brazil
| | - Mariana O Barbosa
- Post-Graduate Program in Plant Biology, Department of Botany, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, 50.670-901, Recife, Pernambuco, Brazil
| | - Andrezza K O Silva
- Department of Geographical Sciences, Post-Graduate Program in Geography, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, 50.670-901, Recife, Pernambuco, Brazil
| | - Williams N de Siqueira
- Department of Biophysics and Radiation Biology, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, 50.670-901, Recife, Pernambuco, Brazil
| | - Nicácio H da Silva
- Post-Graduate Program in Biochemistry and Phisiology, Department of Biochemistry, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, 50.670-901, Recife, Pernambuco, Brazil
| | - Antônio F M de Oliveira
- Post-Graduate Program in Plant Biology, Department of Botany, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, 50.670-901, Recife, Pernambuco, Brazil
| | - Carlos Vicente
- Department of Plant Physiology, Universidad Complutense de Madrid, Calle José Antonio Novais, 12, 28.040, Madrid, Spain
| | - Maria E Legaz
- Department of Plant Physiology, Universidad Complutense de Madrid, Calle José Antonio Novais, 12, 28.040, Madrid, Spain
| | - Eugênia C Pereira
- Post-Graduate Program in Plant Biology, Department of Botany, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, 50.670-901, Recife, Pernambuco, Brazil
- Department of Geographical Sciences, Post-Graduate Program in Geography, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, 50.670-901, Recife, Pernambuco, Brazil
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18
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The Impact of Air Pollution on the Growth of Scots Pine Stands in Poland on the Basis of Dendrochronological Analyses. FORESTS 2021. [DOI: 10.3390/f12101421] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The aim of this study was to evaluate Scots pine stand degradation caused by the pollutants emitted from Zakłądy Azotowe Puławy, one of the biggest polluters of the environment in Poland for over 25 years (1966–1990). To assess the pollution stress in trees, we chose the dendrochronological analysis We outlined three directions for our research: (i) the spatio-temporal distribution of the growth response of trees to the stress associated with air pollution; (ii) the direct and indirect effects of air pollution which may have influenced the growth response of trees; and (iii) the role of local factors, both environmental and technological, in shaping the growth response of trees. Eight Scots pine stands were selected for study, seven plots located in different damage zones and a reference plot in an undamaged stand. We found that pollutant emission caused disturbances of incremental dynamics and long-term strong reduction of growth. A significant decrease in growth was observed for the majority of investigated trees (75%) from 1966 (start of factory) to the end of the 1990s. The zone of destruction extended primarily in easterly and southern directions, from the pollution source, associated with the prevailing winds of the region. At the end of the 1990s, the decreasing trend stopped and the wider tree-rings could be observed. This situation was related to a radical reduction in ammonia emissions and an improvement in environmental conditions. However, the growth of damaged trees due to the weakened health condition is lower than the growth of Scots pine on the reference plot and trees are more sensitive to stressful climatic conditions, especially to drought.
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19
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Impacts of Canopy and Understory Nitrogen Additions on Stomatal Conductance and Carbon Assimilation of Dominant Tree Species in a Temperate Broadleaved Deciduous Forest. Ecosystems 2021. [DOI: 10.1007/s10021-020-00595-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Deininger A, Kaste Ø, Frigstad H, Austnes K. Organic nitrogen steadily increasing in Norwegian rivers draining to the Skagerrak coast. Sci Rep 2020; 10:18451. [PMID: 33116239 PMCID: PMC7595164 DOI: 10.1038/s41598-020-75532-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 10/14/2020] [Indexed: 11/27/2022] Open
Abstract
Declining atmospheric nitrogen (N) deposition, through reduction in the direct input of inorganic N, may result in less inorganic N being leached from soils to freshwaters (dissolved inorganic N = DIN). Declining sulphur deposition, through reducing the ionic strength in soil water, increases the solubility and mobility of organic soil compounds and may result in increased leaching of organically bound N to freshwaters (total organic N = TON). It is unknown to which extent these two independents and opposing trends, i.e. DIN decline versus TON increase, may affect the nutrient balance (load, stoichiometry) of river water draining into coastal zones. By combining long-term atmospheric and riverine monitoring data of the five major Norwegian rivers draining to the Skagerrak coast, we show that over the past 27 years (1990-2017) river water nutrient composition, and specifically N stoichiometry has been steadily shifting from inorganic to organic fractions, with correlations to changes in human pressures (air pollution), but especially climate (precipitation, temperature, discharge). This shift in nutrient quality may have large consequences on the nutrient cycling in both freshwater and coastal ecosystems and illustrates the complex interactions of multiple stressors (here: N deposition, S deposition, and climate change) on aquatic ecosystems.
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Affiliation(s)
- A Deininger
- Centre for Coastal Research, University of Agder, Kristiansand, Norway.
- Norwegian Institute for Water Research (NIVA), Oslo, Norway.
| | - Ø Kaste
- Centre for Coastal Research, University of Agder, Kristiansand, Norway
- Norwegian Institute for Water Research (NIVA), Oslo, Norway
| | - H Frigstad
- Centre for Coastal Research, University of Agder, Kristiansand, Norway
- Norwegian Institute for Water Research (NIVA), Oslo, Norway
| | - K Austnes
- Norwegian Institute for Water Research (NIVA), Oslo, Norway
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21
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Sardans J, Gargallo-Garriga A, Urban O, Klem K, Walker TW, Holub P, Janssens IA, Peñuelas J. Ecometabolomics for a Better Understanding of Plant Responses and Acclimation to Abiotic Factors Linked to Global Change. Metabolites 2020; 10:E239. [PMID: 32527044 PMCID: PMC7345909 DOI: 10.3390/metabo10060239] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 05/25/2020] [Accepted: 06/02/2020] [Indexed: 12/19/2022] Open
Abstract
The number of ecometabolomic studies, which use metabolomic analyses to disentangle organisms' metabolic responses and acclimation to a changing environment, has grown exponentially in recent years. Here, we review the results and conclusions of ecometabolomic studies on the impacts of four main drivers of global change (increasing frequencies of drought episodes, heat stress, increasing atmospheric carbon dioxide (CO2) concentrations and increasing nitrogen (N) loads) on plant metabolism. Ecometabolomic studies of drought effects confirmed findings of previous target studies, in which most changes in metabolism are characterized by increased concentrations of soluble sugars and carbohydrate derivatives and frequently also by elevated concentrations of free amino acids. Secondary metabolites, especially flavonoids and terpenes, also commonly exhibited increased concentrations when drought intensified. Under heat and increasing N loads, soluble amino acids derived from glutamate and glutamine were the most responsive metabolites. Foliar metabolic responses to elevated atmospheric CO2 concentrations were dominated by greater production of monosaccharides and associated synthesis of secondary metabolites, such as terpenes, rather than secondary metabolites synthesized along longer sugar pathways involving N-rich precursor molecules, such as those formed from cyclic amino acids and along the shikimate pathway. We suggest that breeding for crop genotypes tolerant to drought and heat stress should be based on their capacity to increase the concentrations of C-rich compounds more than the concentrations of smaller N-rich molecules, such as amino acids. This could facilitate rapid and efficient stress response by reducing protein catabolism without compromising enzymatic capacity or increasing the requirement for re-transcription and de novo biosynthesis of proteins.
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Affiliation(s)
- Jordi Sardans
- Spain National Research Council (CSIC), Global Ecology Unit CREAF-CSIC-UAB, 08193 Bellaterra, Spain; (A.G.-G.); (J.P.)
- Centre de Recerca Ecològica i Aplicacions Forestals (CREAF) Institute, 08193 Cerdanyola del vallès, Spain
- Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, CZ-60300 Brno, Czech Republic; (O.U.); (K.K.); (P.H.)
| | - Albert Gargallo-Garriga
- Spain National Research Council (CSIC), Global Ecology Unit CREAF-CSIC-UAB, 08193 Bellaterra, Spain; (A.G.-G.); (J.P.)
- Centre de Recerca Ecològica i Aplicacions Forestals (CREAF) Institute, 08193 Cerdanyola del vallès, Spain
- Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, CZ-60300 Brno, Czech Republic; (O.U.); (K.K.); (P.H.)
| | - Otmar Urban
- Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, CZ-60300 Brno, Czech Republic; (O.U.); (K.K.); (P.H.)
| | - Karel Klem
- Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, CZ-60300 Brno, Czech Republic; (O.U.); (K.K.); (P.H.)
| | - Tom W.N. Walker
- Department of Environmental Systems Science, Eidgenössische Technische Hochschule (ETH) Zürich, 8092 Zürich, Switzerland;
| | - Petr Holub
- Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, CZ-60300 Brno, Czech Republic; (O.U.); (K.K.); (P.H.)
| | - Ivan A. Janssens
- Department of Biology, University of Antwerp, 2610 Wilrijk, Belgium;
| | - Josep Peñuelas
- Spain National Research Council (CSIC), Global Ecology Unit CREAF-CSIC-UAB, 08193 Bellaterra, Spain; (A.G.-G.); (J.P.)
- Centre de Recerca Ecològica i Aplicacions Forestals (CREAF) Institute, 08193 Cerdanyola del vallès, Spain
- Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, CZ-60300 Brno, Czech Republic; (O.U.); (K.K.); (P.H.)
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22
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Rotter P, Loreau M, de Mazancourt C. Why do forests respond differently to nitrogen deposition? A modelling approach. Ecol Modell 2020. [DOI: 10.1016/j.ecolmodel.2020.109034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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23
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Kobetičová K, Černý R. Terrestrial eutrophication of building materials and buildings: An emerging topic in environmental studies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 689:1316-1328. [PMID: 31466168 DOI: 10.1016/j.scitotenv.2019.06.423] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 05/27/2019] [Accepted: 06/25/2019] [Indexed: 06/10/2023]
Abstract
Eutrophication has been analyzed mostly in aquatic or soil environments to date. Direct terrestrial eutrophication of building materials and buildings, contrary e.g. to their biodeterioration or biodegradation, was studied so rarely that even its exact definition does not exist yet. In this paper, eutrophication of building materials and buildings as an emerging topic in environmental studies is analyzed in detail and future developments in the field are contemplated. The analysis includes a survey of directly and indirectly related research studies, identification of basic mechanisms and principal factors, and a critical assessment of current methodologies potentially applicable for recognition and classification of eutrophication of building materials and buildings. A definition of direct terrestrial eutrophication of building materials and buildings is proposed afterwards and an alternative method for the calculation of their eutrophication potential is suggested. Finally, recommendations for solving the most urgent problems in future research are formulated.
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Affiliation(s)
- Klára Kobetičová
- Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, CZ-166 29 Prague, Czech Republic.
| | - Robert Černý
- Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, CZ-166 29 Prague, Czech Republic
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24
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Zhu L, Hu Y, Zhao X, Zhao P, Ouyang L, Ni G, Liu N. Specific responses of sap flux and leaf functional traits to simulated canopy and understory nitrogen additions in a deciduous broadleaf forest. FUNCTIONAL PLANT BIOLOGY : FPB 2019; 46:986-993. [PMID: 31280758 DOI: 10.1071/fp18277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 06/10/2019] [Indexed: 06/09/2023]
Abstract
To investigate the effects of atmospheric nitrogen (N) deposition on water use characteristics and leaf traits of trees, we performed canopy (C50) and understory (U50) N additions as NH4NO3 of 50 kg N ha-1 year-1 in a deciduous broadleaf forest of central China. We measured xylem sap flux, crown area:sapwood area ratio (Ca:As), specific leaf area (SLA), mass-based leaf nitrogen content (Nmass) and leaf carbon isotope ratio (δ13C) of Liquidambar formosana Hance, Quercus acutissima Carruth. and Quercus variabilis Blume. Functional traits under different N addition treatments and their responses among tree species were compared and the relationship between xylem sap flux and leaf functional traits under N additions were explored. Results showed that under U50 sap-flux density of xylem significantly decreased for three tree species. But the effect of C50 on sap flux was species-specific. The decrease of sap-flux density with N additions might be caused by the increased Ca/As. δ13C remained constant among different N addition treatments. The responses of SLA and Nmass to N additions were species- and N addition approaches-specific. The correlation of xylem sap flux with leaf traits was not found. Our findings indicate that the effects of canopy N addition on xylem sap flux and leaf functional traits were species-specific and it is necessary to employ canopy N addition for exploring the real responses of forest ecosystems to climate changes in the future researches.
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Affiliation(s)
- Liwei Zhu
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Yanting Hu
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Xiuhua Zhao
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Ping Zhao
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; and Corresponding author.
| | - Lei Ouyang
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Guangyan Ni
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Nan Liu
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
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Hoffman AS, Albeke SE, McMurray JA, Evans RD, Williams DG. Nitrogen deposition sources and patterns in the Greater Yellowstone Ecosystem determined from ion exchange resin collectors, lichens, and isotopes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 683:709-718. [PMID: 31150891 DOI: 10.1016/j.scitotenv.2019.05.323] [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: 12/30/2018] [Revised: 05/20/2019] [Accepted: 05/21/2019] [Indexed: 05/16/2023]
Abstract
Over the past century, atmospheric nitrogen deposition (Ndep) has increased across the western United States due to agricultural and urban development, resulting in degraded ecosystem quality. Regional patterns of Ndep are often estimated by coupling direct measurements from large-scale monitoring networks and atmospheric chemistry models, but such efforts can be problematic in the western US because of complex terrain and sparse sampling. This study aimed not only to understand Ndep patterns in mountainous ecosystems but also to investigate whether isotope values of lichens and throughfall deposition can be used to determine Ndep sources, and serve as an additional tool in ecosystem health assessments. We measured Ndep amounts and δ15N in montane conifer forests of the Greater Yellowstone Ecosystem using canopy throughfall and bulk monitors and lichens. In addition, we examined patterns of C:N ratios in lichens as a possible indicator of lichen physiological condition. The isotopic signature of δ15N of Ndep helps to discern emission sources, because δ15N of NOx from combustion tends to be high (-5 to +25‰) while NHx from agricultural sources tends to be comparatively low (-40 to -10‰). Summertime Ndep increased with elevation and ranged from 0.26 to 1.66 kg ha-1. Ndep was higher than expected in remote areas. The δ15N values of lichens were typically -15.3 to -10‰ suggesting agriculture as a primary emission source of deposition. Lichen %N, δ15N and C:N ratios can provide important information about Ndep sources and patterns over small spatial scales in complex terrain.
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Affiliation(s)
| | - Shannon E Albeke
- University of Wyoming, Laramie, WY 82071, United States of America
| | - Jill A McMurray
- Bridger Teton National Forest, United States Forest Service, Pinedale, WY 82941, United States of America
| | - R David Evans
- School of Biological Sciences, Washington State University, Pullman, WA 99164, United States of America
| | - David G Williams
- University of Wyoming, Laramie, WY 82071, United States of America
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Clark CM, Richkus J, Jones PW, Phelan J, Burns DA, de Vries W, Du E, Fenn ME, Jones L, Watmough SA. A synthesis of ecosystem management strategies for forests in the face of chronic nitrogen deposition. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 248:1046-1058. [PMID: 31091637 DOI: 10.1016/j.envpol.2019.02.006] [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: 08/04/2018] [Revised: 01/27/2019] [Accepted: 02/03/2019] [Indexed: 06/09/2023]
Abstract
Total nitrogen (N) deposition has declined in many parts of the U.S. and Europe since the 1990s. Even so, it appears that decreased N deposition alone may be insufficient to induce recovery from the impacts of decades of elevated deposition, suggesting that management interventions may be necessary to promote recovery. Here we review the effectiveness of four remediation approaches (prescribed burning, thinning, liming, carbon addition) on three indicators of recovery from N deposition (decreased soil N availability, increased soil alkalinity, increased plant diversity), focusing on literature from the U.S. We reviewed papers indexed in the Web of Science since 1996 using specific key words, extracted data on the responses to treatment along with ancillary data, and conducted a meta-analysis using a three-level variance model structure. We found 69 publications (and 2158 responses) that focused on one of these remediation treatments in the context of N deposition, but only 29 publications (and 408 responses) reported results appropriate for our meta-analysis. We found that carbon addition was the only treatment that decreased N availability (effect size: -1.80 to -1.84 across metrics), while liming, thinning, and prescribed burning all tended to increase N availability (effect sizes: +0.4 to +1.2). Only liming had a significant positive effect on soil alkalinity (+10.5%-82.2% across metrics). Only prescribed burning and thinning affected plant diversity, but with opposing and often statistically marginal effects across metrics (i.e., increased richness, decreased Shannon or Simpson diversity). Thus, it appears that no single treatment is effective in promoting recovery from N deposition, and combinations of treatments should be explored. These conclusions are based on the limited published data available, underscoring the need for more studies in forested areas and more consistent reporting suitable for meta-analyses across studies.
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Affiliation(s)
- Christopher M Clark
- US Environmental Protection Agency, Office of Research and Development, National Center for Environmental Assessment, Washington, DC, 20460, USA.
| | - Jennifer Richkus
- RTI International, 3040 East Cornwallis Rd, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Phillip W Jones
- RTI International, 3040 East Cornwallis Rd, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Jennifer Phelan
- RTI International, 3040 East Cornwallis Rd, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Douglas A Burns
- US Geological Survey New York Water Science Center, 425 Jordan Road, Troy, NY, 12180, USA
| | - Wim de Vries
- Wageningen University and Research, Environmental Systems Analysis Group, PO Box 47, 6700AA, Wageningen, the Netherlands
| | - Enzai Du
- State Key Laboratory of Earth Surface Processes and Resource Ecology, School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China
| | - Mark E Fenn
- USDA Forest Service, Pacific Southwest Research Station, 4955 Canyon Crest Drive, Riverside, CA, 92507, USA
| | - Laurence Jones
- Centre for Ecology & Hydrology, Environment Centre Wales, Deiniol Rd, Bangor, LL57 2UW, United Kingdom
| | - Shaun A Watmough
- School of the Environment, Trent University, Peterborough, Ontario, K9L 0G2, Canada
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Antarctic Studies Show Lichens to be Excellent Biomonitors of Climate Change. DIVERSITY-BASEL 2019. [DOI: 10.3390/d11030042] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Lichens have been used as biomonitors for multiple purposes. They are well-known as air pollution indicators around urban and industrial centers. More recently, several attempts have been made to use lichens as monitors of climate change especially in alpine and polar regions. In this paper, we review the value of saxicolous lichens for monitoring environmental changes in Antarctic regions. The pristine Antarctica offers a unique opportunity to study the effects of climate change along a latitudinal gradient that extends between 62° and 87° S. Both lichen species diversity and thallus growth rate seem to show significant correlations to mean annual temperature for gradients across the continent as well as to short time climate oscillation in the Antarctic Peninsula. Competition interactions appear to be small so that individual thalli develop in balance with environmental conditions and, as a result, can indicate the trends in productivity for discrete time intervals over long periods of time.
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Hu Y, Zhao P, Zhu L, Zhao X, Ni G, Ouyang L, Schäfer KVR, Shen W. Responses of sap flux and intrinsic water use efficiency to canopy and understory nitrogen addition in a temperate broadleaved deciduous forest. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 648:325-336. [PMID: 30121032 DOI: 10.1016/j.scitotenv.2018.08.158] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 08/12/2018] [Accepted: 08/12/2018] [Indexed: 06/08/2023]
Abstract
Increasing atmospheric nitrogen (N) deposition could profoundly impact structure and functioning of forest ecosystems. Therefore, we conducted a two-year (2014-2015) experiment to assess the responses of tree sap flux density (Js) and intrinsic water use efficiency (WUEi) of dominant tree species (Liquidambar formosana, Quercus acutissima and Quercus variabilis) to increased N deposition at a manipulative experiment with canopy and understory N addition in a deciduous broadleaved forest. Five treatments were administered including N addition of 25 kg ha-1 year-1 and 50 kg ha-1 year-1 onto canopy (C25 and C50) and understory (U25 and U50), and control treatment (CK, without N addition). Our results showed neither canopy nor understory N addition had an impact on leaf N content and C:N ratio (P > 0.05). Due to the distinct influencing ways, canopy and understory N addition generated different impacts on Js and WUEi of the dominant tree species. Canopy N addition increased WUEi of Q. variabilis, whereas understory addition treatment had a minimal impact on WUEi. Both N additions did not exert impacts on WUEi of L. formosana and Q. acutissima. Canopy N addition exerted negative impacts on Js and its sensitivity to micrometeorological factors of Q. acutissima and Q. variabilis in 2014, while understory addition showed no effect. Neither canopy nor understory N addition had an influence on Js of L. formosana in 2014. Probably owing to the increased soil acidification as the experiment proceeded, Js of L. formosana and Q. variabilis was decreased by understory N addition while canopy addition had a minimal effect in 2015. Thus, the traditional understory addition approach could not fully reflect the effects of increased N deposition on the canopy-associated transpiration process indicated by the different responses of Js and WUEi to canopy and understory N addition, and exaggerated its influences induced by the variation of soil chemical properties.
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Affiliation(s)
- Yanting Hu
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Road Xingke 723, District Tianhe, Guangzhou 510650, China
| | - Ping Zhao
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Road Xingke 723, District Tianhe, Guangzhou 510650, China; Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Road Xingke 723, District Tianhe, Guangzhou 510650, China.
| | - Liwei Zhu
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Road Xingke 723, District Tianhe, Guangzhou 510650, China
| | - Xiuhua Zhao
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Road Xingke 723, District Tianhe, Guangzhou 510650, China
| | - Guangyan Ni
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Road Xingke 723, District Tianhe, Guangzhou 510650, China
| | - Lei Ouyang
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Road Xingke 723, District Tianhe, Guangzhou 510650, China
| | - Karina V R Schäfer
- Department of Biological Sciences, Rutgers University, 195 University Avenue, Newark 07102, NJ, USA; Department of Earth and Environmental Sciences, Rutgers University, 195 University Avenue, Newark 07102, NJ, USA
| | - Weijun Shen
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Road Xingke 723, District Tianhe, Guangzhou 510650, China; Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Road Xingke 723, District Tianhe, Guangzhou 510650, China
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29
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Response mechanisms of leaf nutrients of endangered plant (Acer catalpifolium) to environmental factors varied at different growth stages. Glob Ecol Conserv 2019. [DOI: 10.1016/j.gecco.2019.e00521] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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30
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CLARK CHRISTOPHERM, PHELAN JENNIFER, DORAISWAMY PRAKASH, BUCKLEY JOHN, CAJKA JAMESC, DENNIS ROBINL, LYNCH JASON, NOLTE CHRISTOPHERG, SPERO TANYAL. Atmospheric deposition and exceedances of critical loads from 1800-2025 for the conterminous United States. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2018; 28:978-1002. [PMID: 29714821 PMCID: PMC8637495 DOI: 10.1002/eap.1703] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 12/09/2017] [Accepted: 12/21/2017] [Indexed: 05/26/2023]
Abstract
Atmospheric deposition of nitrogen (N) and sulfur (S) has increased dramatically over pre-industrial levels, with many potential impacts on terrestrial and aquatic ecosystems. Quantitative thresholds, termed "critical loads" (CLs), have been developed to estimate the deposition rate above which damage is thought to occur. However, there remains no comprehensive comparison of when, where, and over what time periods individual CLs have been exceeded. We addressed this knowledge gap by combining several published data sources for historical and contemporary deposition, and overlaying these on six CL types from the National Critical Loads Database (NCLDv2.5; terrestrial acidification, aquatic acidification, lichen, nitrate leaching, plant community composition, and forest-tree health) to examine exceedances from 1800 to 2011. We expressed CLs as the minimum, 10th, and 50th percentiles within 12-km grid cells. Minimum CLs were relatively uniform across the country (200-400 eq·ha-1 ·yr-1 ), and have been exceeded for decades beginning in the early 20th century. The area exceeding minimum CLs peaked in the 1970s and 1980s, exposing 300,000 to 3 million km2 (depending on the CL type) to harmful levels of deposition, with a total area exceeded of 5.8 million km2 (~70% of the conterminous United States). Since then, deposition levels have dropped, especially for S, with modest reductions in exceedance by 2011 for all CL types, totaling 5.2 million km2 in exceedance. The 10th and 50th percentile CLs followed similar trends, but were not consistently available at the 12-km grid scale. We also examined near-term future deposition and exceedances in 2025 under current air quality regulations, and under various scenarios of climate change and additional nitrogen management controls. Current regulations were projected to reduce exceedances of any CL from 5.2 million km2 in 2011 to 4.8 million km2 in 2025. None of the additional N management or climate scenarios significantly affected areal exceedances, although exceedance severity declined. In total, it is clear that many CLs have been exceeded for decades, and are likely to remain so in the short term under current policies. Additionally, we suggest many areas for improvement to enhance our understanding of deposition and its effects to support informed decision making.
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Affiliation(s)
- CHRISTOPHER M. CLARK
- U.S. Environmental Protection Agency (8623-P), Office of Research and Development, National Center for Environmental Assessment, 1200 Pennsylvania Ave NW, Washington DC 20460 USA
| | - JENNIFER PHELAN
- RTI International, 3040 East Cornwallis Rd., P.O. Box 12194, Research Triangle Park, NC 27709 USA
| | - PRAKASH DORAISWAMY
- RTI International, 3040 East Cornwallis Rd., P.O. Box 12194, Research Triangle Park, NC 27709 USA
| | - JOHN BUCKLEY
- RTI International, 3040 East Cornwallis Rd., P.O. Box 12194, Research Triangle Park, NC 27709 USA
| | - JAMES C. CAJKA
- RTI International, 3040 East Cornwallis Rd., P.O. Box 12194, Research Triangle Park, NC 27709 USA
| | - ROBIN L. DENNIS
- Retired. U.S. Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, NC 27709 USA
| | - JASON LYNCH
- U.S. Environmental Protection Agency, Office of Atmospheric Programs, 1200 Pennsylvania Ave NW, Washington DC 20460 USA
| | - CHRISTOPHER G. NOLTE
- U.S. Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, NC 27709 USA
| | - TANYA L. SPERO
- U.S. Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, NC 27709 USA
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