1
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Power CC, Normand S, von Arx G, Elberling B, Corcoran D, Krog AB, Bouvin NK, Treier UA, Westergaard-Nielsen A, Liu Y, Prendin AL. No effect of snow on shrub xylem traits: Insights from a snow-manipulation experiment on Disko Island, Greenland. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 916:169896. [PMID: 38185160 DOI: 10.1016/j.scitotenv.2024.169896] [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: 09/21/2023] [Revised: 12/18/2023] [Accepted: 01/02/2024] [Indexed: 01/09/2024]
Abstract
Widespread shrubification across the Arctic has been generally attributed to increasing air temperatures, but responses vary across species and sites. Wood structures related to the plant hydraulic architecture may respond to local environmental conditions and potentially impact shrub growth, but these relationships remain understudied. Using methods of dendroanatomy, we analysed shrub ring width (RW) and xylem anatomical traits of 80 individuals of Salix glauca L. and Betula nana L. at a snow manipulation experiment in Western Greenland. We assessed how their responses differed between treatments (increased versus ambient snow depth) and soil moisture regimes (wet and dry). Despite an increase in snow depth due to snow fences (28-39 %), neither RW nor anatomical traits in either species showed significant responses to this increase. In contrast, irrespective of the snow treatment, the xylem specific hydraulic conductivity (Ks) and earlywood vessel size (LA95) for the study period were larger in S. glauca (p < 0.1, p < 0.01) and B. nana (p < 0.01, p < 0.001) at the wet than the dry site, while both species had larger vessel groups at the dry than the wet site (p < 0.01). RW of B. nana was higher at the wet site (p < 0.01), but no differences were observed for S. glauca. Additionally, B. nana Ks and LA95 showed different trends over the study period, with decreases observed at the dry site (p < 0.001), while for other responses no difference was observed. Our results indicate that, taking into account ontogenetic and allometric trends, hydraulic related xylem traits of both species, along with B. nana growth, were influenced by soil moisture. These findings suggest that soil moisture regime, but not snow cover, may determine xylem responses to future climate change and thus add to the heterogeneity of Arctic shrub dynamics, though more long-term species- and site- specific studies are needed.
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Affiliation(s)
- Candice C Power
- Ecoinformatics and Biodiversity, Department of Biology, Aarhus University, Denmark.
| | - Signe Normand
- Ecoinformatics and Biodiversity, Department of Biology, Aarhus University, Denmark; SustainScapes - Center for Sustainable Landscapes under Global Change, Aarhus University, Denmark
| | - Georg von Arx
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
| | - Bo Elberling
- Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark
| | - Derek Corcoran
- Ecoinformatics and Biodiversity, Department of Biology, Aarhus University, Denmark; SustainScapes - Center for Sustainable Landscapes under Global Change, Aarhus University, Denmark
| | - Amanda B Krog
- Ecoinformatics and Biodiversity, Department of Biology, Aarhus University, Denmark
| | | | - Urs Albert Treier
- Ecoinformatics and Biodiversity, Department of Biology, Aarhus University, Denmark; SustainScapes - Center for Sustainable Landscapes under Global Change, Aarhus University, Denmark
| | - Andreas Westergaard-Nielsen
- Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark
| | - Yijing Liu
- Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark
| | - Angela L Prendin
- Ecoinformatics and Biodiversity, Department of Biology, Aarhus University, Denmark; Department of Land Environment Agriculture and Forestry (TeSAF), University of Padova, Legnaro, Italy
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2
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López-Blanco E, Langen PL, Williams M, Christensen JH, Boberg F, Langley K, Christensen TR. The future of tundra carbon storage in Greenland - Sensitivity to climate and plant trait changes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 846:157385. [PMID: 35870583 DOI: 10.1016/j.scitotenv.2022.157385] [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: 04/11/2022] [Revised: 07/02/2022] [Accepted: 07/11/2022] [Indexed: 06/15/2023]
Abstract
The continuous change in observed key indicators such as increasing nitrogen deposition, temperatures and precipitation will have marked but uncertain consequences for the ecosystem carbon (C) sink-source functioning of the Arctic. Here, we use multiple in-situ data streams measured by the Greenland Ecosystem Monitoring programme in tight connection with the Soil-Plant-Atmosphere model and climate projections from the high-resolution HIRHAM5 regional model. We apply this modelling framework with focus on two climatically different tundra sites in Greenland (Zackenberg and Kobbefjord) to assess how sensitive the net C uptake will expectedly be under warmer and wetter conditions across the 21st century and pin down the relative contribution to the overall C sink strength from climate versus plant trait variability. Our results suggest that temperatures (5-7.7 °C), total precipitation (19-110 %) and vapour pressure deficit will increase (32-36 %), while shortwave radiation will decline (6-9 %) at both sites by 2100 under the RCP8.5 scenario. Such a combined effect will, on average, intensify the net C uptake by 9-10 g C m-2 year-1 at both sites towards the end of 2100, but Zackenberg is expected to have more than twice the C sink strength capacity of Kobbefjord. Our sensitivity analysis not only reveals that plant traits are the most sensitive parameters controlling the net C exchange in both sites at the beginning and end of the century, but also that the projected increase in the net C uptake will likely be similarly influenced by future changes in climate and existing local nutrient conditions. A series of experiments forcing realistic changes in plant nitrogen status at both sites corroborates this hypothesis. This work proves the unique synergy between monitoring data and numerical models to assist robust model calibration/validation and narrow uncertainty ranges and ultimately produce more reliable C cycle projections in understudied regions such as Greenland.
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Affiliation(s)
- Efrén López-Blanco
- Department of Environment and Minerals, Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900 Nuuk, Greenland; Department of Ecoscience, Arctic Research Center, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark.
| | - Peter L Langen
- Department of Environmental Sciences, iClimate, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Mathew Williams
- School of GeoSciences and NCEO, University of Edinburgh, Alexander Crum Brown Road, EH9 3FF Edinburgh, UK
| | - Jens Hesselbjerg Christensen
- Niels Bohr Institute, Copenhagen University, Tagensvej 16, 2200 Copenhagen, Denmark; Danish Meteorological Institute, Lyngbyvej 100, 2100 Copenhagen, Denmark; NORCE, Norwegian Research Centre AS, Bjerknes Centre for Climate Research, P.O.B 22 Nygårdstangen, 5838 Bergen, Norway
| | - Fredrik Boberg
- Danish Meteorological Institute, Lyngbyvej 100, 2100 Copenhagen, Denmark
| | - Kirsty Langley
- Asiaq, Greenland Survey, Qatserisut 8, 3900 Nuuk, Greenland
| | - Torben Røjle Christensen
- Department of Ecoscience, Arctic Research Center, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark; Oulanka Research Station, Oulu University, PO Box 8000, 90014, Finland
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3
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Oehri J, Schaepman-Strub G, Kim JS, Grysko R, Kropp H, Grünberg I, Zemlianskii V, Sonnentag O, Euskirchen ES, Reji Chacko M, Muscari G, Blanken PD, Dean JF, di Sarra A, Harding RJ, Sobota I, Kutzbach L, Plekhanova E, Riihelä A, Boike J, Miller NB, Beringer J, López-Blanco E, Stoy PC, Sullivan RC, Kejna M, Parmentier FJW, Gamon JA, Mastepanov M, Wille C, Jackowicz-Korczynski M, Karger DN, Quinton WL, Putkonen J, van As D, Christensen TR, Hakuba MZ, Stone RS, Metzger S, Vandecrux B, Frost GV, Wild M, Hansen B, Meloni D, Domine F, te Beest M, Sachs T, Kalhori A, Rocha AV, Williamson SN, Morris S, Atchley AL, Essery R, Runkle BRK, Holl D, Riihimaki LD, Iwata H, Schuur EAG, Cox CJ, Grachev AA, McFadden JP, Fausto RS, Göckede M, Ueyama M, Pirk N, de Boer G, Bret-Harte MS, Leppäranta M, Steffen K, Friborg T, Ohmura A, Edgar CW, Olofsson J, Chambers SD. Vegetation type is an important predictor of the arctic summer land surface energy budget. Nat Commun 2022; 13:6379. [PMID: 36316310 PMCID: PMC9622844 DOI: 10.1038/s41467-022-34049-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 10/11/2022] [Indexed: 11/05/2022] Open
Abstract
Despite the importance of high-latitude surface energy budgets (SEBs) for land-climate interactions in the rapidly changing Arctic, uncertainties in their prediction persist. Here, we harmonize SEB observations across a network of vegetated and glaciated sites at circumpolar scale (1994-2021). Our variance-partitioning analysis identifies vegetation type as an important predictor for SEB-components during Arctic summer (June-August), compared to other SEB-drivers including climate, latitude and permafrost characteristics. Differences among vegetation types can be of similar magnitude as between vegetation and glacier surfaces and are especially high for summer sensible and latent heat fluxes. The timing of SEB-flux summer-regimes (when daily mean values exceed 0 Wm-2) relative to snow-free and -onset dates varies substantially depending on vegetation type, implying vegetation controls on snow-cover and SEB-flux seasonality. Our results indicate complex shifts in surface energy fluxes with land-cover transitions and a lengthening summer season, and highlight the potential for improving future Earth system models via a refined representation of Arctic vegetation types.
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Affiliation(s)
- Jacqueline Oehri
- grid.7400.30000 0004 1937 0650Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland ,grid.14709.3b0000 0004 1936 8649Department of Biology, McGill University, 1205 Docteur Penfield, H3A 1B1 Montreal, QC Canada
| | - Gabriela Schaepman-Strub
- grid.7400.30000 0004 1937 0650Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Jin-Soo Kim
- grid.7400.30000 0004 1937 0650Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland ,grid.35030.350000 0004 1792 6846Low-Carbon and Climate Impact Research Centre, School of Energy and Environment, City University of Hong Kong, Tat Chee Ave, Kowloon Tong, Hongkong, People’s Republic of China
| | - Raleigh Grysko
- grid.7400.30000 0004 1937 0650Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Heather Kropp
- grid.256766.60000 0004 1936 7881Environmental Studies Program, Hamilton College, 198 College Hill Rd, Clinton, NY USA
| | - Inge Grünberg
- grid.10894.340000 0001 1033 7684Permafrost Research Section, Alfred-Wegener Institute, Telegrafenberg, 14473 Potsdam Germany
| | - Vitalii Zemlianskii
- grid.7400.30000 0004 1937 0650Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Oliver Sonnentag
- grid.14848.310000 0001 2292 3357Département de géographie, Université de Montréal, 2900 Edouard Montpetit Blvd, Montreal, QC H3T 1J4 Canada
| | - Eugénie S. Euskirchen
- grid.70738.3b0000 0004 1936 981XInstitute of Arctic Biology, University of Alaska Fairbanks, 2140 Koyukuk Dr, Fairbanks, AK USA
| | - Merin Reji Chacko
- grid.7400.30000 0004 1937 0650Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland ,grid.5801.c0000 0001 2156 2780Institute of Terrestrial Ecosystems, ETH Zurich, CHN, Universitätstrasse 16, 8006 Zurich, Switzerland ,grid.419754.a0000 0001 2259 5533Land Change Science Unit, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, ZH Switzerland
| | - Giovanni Muscari
- grid.410348.a0000 0001 2300 5064Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605 Rome, Italy
| | - Peter D. Blanken
- grid.266190.a0000000096214564Department of Geography, University of Colorado, Boulder, CO USA
| | - Joshua F. Dean
- grid.5337.20000 0004 1936 7603School of Geographical Sciences, University of Bristol, University Rd, Bristol, UK
| | - Alcide di Sarra
- grid.5196.b0000 0000 9864 2490Department for Sustainability, ENEA, Via Enrico Fermi 45, Frascati, Italy
| | - Richard J. Harding
- grid.494924.60000 0001 1089 2266UK Centre for Ecology & Hydrology (UKCEH), MacLean Bldg, Benson Ln, Crowmarsh Gifford, Wallingford, UK
| | - Ireneusz Sobota
- grid.5374.50000 0001 0943 6490Department of Hydrology and Water Management, Faculty of Earth Sciences and Spatial Management, Nicolaus Copernicus University, Lwowska, 87-100 Toruń Poland
| | - Lars Kutzbach
- grid.9026.d0000 0001 2287 2617Center for Earth System Research and Sustainability (CEN), University of Hamburg, Bundesstrasse 53, 20146 Hamburg, Germany
| | - Elena Plekhanova
- grid.7400.30000 0004 1937 0650Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Aku Riihelä
- grid.8657.c0000 0001 2253 8678Finnish Meteorological Institute, Erik Palménin aukio 1, 00560 Helsinki, Finland
| | - Julia Boike
- grid.10894.340000 0001 1033 7684Permafrost Research Section, Alfred-Wegener Institute, Telegrafenberg, 14473 Potsdam Germany ,grid.7468.d0000 0001 2248 7639Geography Department, Humboldt-Universität zu Berlin, Unter den Linden 6, 10117 Berlin, Germany
| | - Nathaniel B. Miller
- grid.14003.360000 0001 2167 3675University of Wisconsin-Madison, Madison, WI USA
| | - Jason Beringer
- grid.1012.20000 0004 1936 7910School of Agriculture and Environment, The University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009 WA Australia
| | - Efrén López-Blanco
- grid.424543.00000 0001 0741 5039Department of Environment and Minerals, Greenland Institute of Natural Resources, Kivioq 2, Nuuk, 3900 Greenland ,grid.7048.b0000 0001 1956 2722Department of Ecoscience, Aarhus University, Nordre Ringgade 1, 8000 Aarhus C, Denmark
| | - Paul C. Stoy
- grid.14003.360000 0001 2167 3675University of Wisconsin-Madison, Madison, WI USA
| | - Ryan C. Sullivan
- grid.187073.a0000 0001 1939 4845Environmental Science Division, Argonne National Laboratory, 9700 S Cass Ave, Lemont, IL USA
| | - Marek Kejna
- grid.5374.50000 0001 0943 6490Department of Meteorology and Climatology, Faculty of Earth Sciences and Spatial Management, Nicolaus Copernicus University, Lwowska, 87-100 Toruń Poland
| | - Frans-Jan W. Parmentier
- grid.5510.10000 0004 1936 8921Center for Biogeochemistry of the Anthropocene, Department of Geosciences, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway ,grid.4514.40000 0001 0930 2361Department of Physical Geography and Ecosystem Science, Lund University, Geocentrum II, Sölvegatan 12, 223 62 Lund, Sweden
| | - John A. Gamon
- grid.24434.350000 0004 1937 0060University of Nebraska - Lincoln, 1400 R St, Lincoln, NE USA
| | - Mikhail Mastepanov
- grid.7048.b0000 0001 1956 2722Department of Ecoscience, Aarhus University, Nordre Ringgade 1, 8000 Aarhus C, Denmark ,grid.10858.340000 0001 0941 4873Oulanka Research Station, University of Oulu, Pentti Kaiteran katu 1, 90570 Oulu, Finland
| | - Christian Wille
- grid.23731.340000 0000 9195 2461GFZ German Research Centre for Geosciences, Wissenschaftspark Albert Einstein, Telegrafenberg, 14473 Potsdam Germany
| | - Marcin Jackowicz-Korczynski
- grid.7048.b0000 0001 1956 2722Department of Ecoscience, Aarhus University, Nordre Ringgade 1, 8000 Aarhus C, Denmark ,grid.4514.40000 0001 0930 2361Department of Physical Geography and Ecosystem Science, Lund University, Geocentrum II, Sölvegatan 12, 223 62 Lund, Sweden
| | - Dirk N. Karger
- grid.419754.a0000 0001 2259 5533Swiss Federal Institute for Forest, Snow, and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, ZH Switzerland
| | - William L. Quinton
- grid.268252.90000 0001 1958 9263Cold Regions Research Centre, Wilfrid Laurier University, 75 University Ave W, Waterloo, ON Canada
| | - Jaakko Putkonen
- grid.266862.e0000 0004 1936 8163Harold Hamm School of Geology and Geological Engineering, University of North Dakota, Grand Forks, ND USA
| | - Dirk van As
- grid.13508.3f0000 0001 1017 5662Department of Glaciology and Climate, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, 1350 Copenhagen, Denmark
| | - Torben R. Christensen
- grid.7048.b0000 0001 1956 2722Department of Ecoscience, Aarhus University, Nordre Ringgade 1, 8000 Aarhus C, Denmark ,grid.10858.340000 0001 0941 4873Oulanka Research Station, University of Oulu, Pentti Kaiteran katu 1, 90570 Oulu, Finland
| | - Maria Z. Hakuba
- grid.20861.3d0000000107068890Jet Propulsion Laboratory, CalTech, 4800 Oak Grove Dr, Pasadena, CA USA
| | - Robert S. Stone
- grid.423024.30000 0000 8485 3852NOAA Global Monitoring Laboratory, 325 Broadway, Boulder, CO USA
| | - Stefan Metzger
- grid.422235.00000 0004 6483 1479National Ecological Observatory Network, Battelle, 1685 38th St #100, Boulder, CO USA ,grid.14003.360000 0001 2167 3675Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, 1225 W Dayton St, Madison, WI USA
| | - Baptiste Vandecrux
- grid.13508.3f0000 0001 1017 5662Department of Glaciology and Climate, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, 1350 Copenhagen, Denmark
| | - Gerald V. Frost
- grid.487865.00000 0004 5928 6410Alaska Biological Research, Inc, 2842 Goldstream Rd, Fairbanks, AK USA
| | - Martin Wild
- grid.5801.c0000 0001 2156 2780Institute for Atmospheric and Climate Science, ETH Zurich, CHN, Universitätstrasse 16, 8006 Zurich, Switzerland
| | - Birger Hansen
- grid.5254.60000 0001 0674 042XDepartment of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, 1958 Frederiksberg, Denmark
| | - Daniela Meloni
- grid.5196.b0000 0000 9864 2490Department for Sustainability, ENEA, Lungotevere Grande Ammiraglio Thaon di Revel, 76, Rome, Italy
| | - Florent Domine
- grid.23856.3a0000 0004 1936 8390Department of Chemistry, Université Laval, Pavillon Alexandre-Vachon, 1045 Av. de la Médecine, G1V 0A6 Québec, QC Canada ,grid.23856.3a0000 0004 1936 8390Takuvik Laboratory, CNRS-INSU, Département de Biologie, Université Laval, Pavillon Alexandre-Vachon, 1045 Av. de la Médecine, G1V 0A6 Québec, QC Canada
| | - Mariska te Beest
- grid.5477.10000000120346234Copernicus Institute of Sustainable Development, Utrecht University, Vening Meinesz Building, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands ,grid.412139.c0000 0001 2191 3608Centre for African Conservation Ecology, Nelson Mandela University, University Way, Summerstrand, Gqeberha, 6019 Port Elizabeth, South Africa
| | - Torsten Sachs
- grid.23731.340000 0000 9195 2461GFZ German Research Centre for Geosciences, Wissenschaftspark Albert Einstein, Telegrafenberg, 14473 Potsdam Germany
| | - Aram Kalhori
- grid.23731.340000 0000 9195 2461GFZ German Research Centre for Geosciences, Wissenschaftspark Albert Einstein, Telegrafenberg, 14473 Potsdam Germany
| | - Adrian V. Rocha
- grid.131063.60000 0001 2168 0066Department of Biological Sciences, University of Notre Dame, 100 Galvin Life Sciences, Notre Dame, IN USA
| | - Scott N. Williamson
- grid.55614.330000 0001 1302 4958Polar Knowledge Canada, Canadian High Arctic Research Station, 1 rue Uvajuq place, CP 2150 Cambridge Bay, NU Canada
| | - Sara Morris
- grid.511342.0NOAA Physical Sciences Laboratory, 325 Broadway, Boulder, CO USA
| | - Adam L. Atchley
- grid.148313.c0000 0004 0428 3079Los Alamos National Laboratory, Bikini Atoll Rd., SM 30, Los Alamos, NM USA
| | - Richard Essery
- grid.4305.20000 0004 1936 7988School of Geosciences, University of Edinburgh, Drummond St, Edinburgh, EH8 9XP UK
| | - Benjamin R. K. Runkle
- grid.411017.20000 0001 2151 0999Department of Biological & Agricultural Engineering, University of Arkansas, 1164 W Maple St, Fayetteville, AR USA
| | - David Holl
- grid.9026.d0000 0001 2287 2617Center for Earth System Research and Sustainability (CEN), University of Hamburg, Bundesstrasse 53, 20146 Hamburg, Germany
| | - Laura D. Riihimaki
- grid.423024.30000 0000 8485 3852NOAA Global Monitoring Laboratory, 325 Broadway, Boulder, CO USA ,grid.266190.a0000000096214564CIRES (Cooperative Institute for Research in Environmental Sciences), 216 UCB, University of Colorado Boulder Campus, Boulder, CO USA
| | - Hiroki Iwata
- grid.263518.b0000 0001 1507 4692Department of Environmental Science, Shinshu University, 3 Chome-1-1 Asahi, Matsumoto, Nagano, 390-8621 Japan
| | - Edward A. G. Schuur
- grid.261120.60000 0004 1936 8040Center for Ecosystem Science and Society, Northern Arizona University, S San Francisco St, Flagstaff, AZ USA
| | - Christopher J. Cox
- grid.511342.0NOAA Physical Sciences Laboratory, 325 Broadway, Boulder, CO USA
| | - Andrey A. Grachev
- DEVCOM Army Research Laboratory, Owen Rd, White Sands Missile Range, New Mexico, NM USA
| | - Joseph P. McFadden
- grid.133342.40000 0004 1936 9676Department of Geography and Earth Research Institute, University of California Santa Barbara, 5816 Ellison Hall, Isla Vista, CA USA
| | - Robert S. Fausto
- grid.13508.3f0000 0001 1017 5662Department of Glaciology and Climate, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, 1350 Copenhagen, Denmark
| | - Mathias Göckede
- grid.419500.90000 0004 0491 7318Department of Biogeochemical Signals, Max Planck Institute for Biogeochemistry, Hans-Knöll-Straße 10, 07745 Jena, Germany
| | - Masahito Ueyama
- Osaka Metropolitan University, Sakai, Kita Ward, Umeda, 1 Chome−2 − 2-600, Osaka, Japan
| | - Norbert Pirk
- grid.5510.10000 0004 1936 8921Department of Geosciences, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway
| | - Gijs de Boer
- grid.511342.0NOAA Physical Sciences Laboratory, 325 Broadway, Boulder, CO USA ,grid.266190.a0000000096214564CIRES (Cooperative Institute for Research in Environmental Sciences), 216 UCB, University of Colorado Boulder Campus, Boulder, CO USA ,grid.266190.a0000000096214564IRISS (Integrated Remote and In Situ Sensing), University of Colorado, Boulder, CO USA
| | - M. Syndonia Bret-Harte
- grid.70738.3b0000 0004 1936 981XInstitute of Arctic Biology, University of Alaska Fairbanks, 2140 Koyukuk Dr, Fairbanks, AK USA
| | - Matti Leppäranta
- grid.7737.40000 0004 0410 2071University of Helsinki, Yliopistonkatu 4, 00100 Helsinki, Finland
| | - Konrad Steffen
- grid.419754.a0000 0001 2259 5533Swiss Federal Institute for Forest, Snow, and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, ZH Switzerland
| | - Thomas Friborg
- grid.5254.60000 0001 0674 042XDepartment of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, 1958 Frederiksberg, Denmark
| | - Atsumu Ohmura
- grid.5801.c0000 0001 2156 2780Institute for Atmospheric and Climate Science, ETH Zurich, CHN, Universitätstrasse 16, 8006 Zurich, Switzerland
| | - Colin W. Edgar
- grid.70738.3b0000 0004 1936 981XInstitute of Arctic Biology, University of Alaska Fairbanks, 2140 Koyukuk Dr, Fairbanks, AK USA
| | - Johan Olofsson
- grid.12650.300000 0001 1034 3451Department of Ecology and Environmental Science, Umeå University, Linnaeus väg 4-6, 907 36 Umeå, Sweden
| | - Scott D. Chambers
- grid.1089.00000 0004 0432 8812ANSTO Lucas Heights, New Illawarra Rd, Lucas Heights NSW, 2234 Sydney, NSW Australia
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4
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Crichton KA, Anderson K, Charman DJ, Gallego-Sala A. Seasonal climate drivers of peak NDVI in a series of Arctic peatlands. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 838:156419. [PMID: 35662594 DOI: 10.1016/j.scitotenv.2022.156419] [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: 04/12/2022] [Revised: 05/24/2022] [Accepted: 05/30/2022] [Indexed: 06/15/2023]
Abstract
Changes in plant cover and productivity are important in driving Arctic soil carbon dynamics and sequestration, especially in peatlands. Warming trends in the Arctic are known to have resulted in changes in plant productivity, extent and community composition, but more data are still needed to improve understanding of the complex controls and processes involved. Here we assess plant productivity response to climate variability between 1985 and 2020 by comparing peak growing season NDVI (Normalised Difference Vegetation Index data from Landsat 5 and 7), to seasonal-average weather data (temperature, precipitation and snow-melt timing) in nine locations containing peatlands in high- and low-Arctic regions in Europe and Canada. We find that spring (correlation 0.36 for peat dominant and 0.39 for mosaic; MLR coefficient 0.20 for peat, 0.29 for mosaic), summer (0.47, 0.42; 0.18, 0.17) and preceding-autumn (0.35, 0.25; 0.33, 0.27) temperature are linked to peak growing season NDVI at our sites between 1985 and 2020, whilst spring snow melt timing (0.42, 0.45; 0.25, 0.32) is also important, and growing season water availability is likely site-specific. According to regression trees, a warm preceding autumn (September-October-November) is more important than a warm summer (June-July-August) in predicting the highest peak season productivity in the peat-dominated areas. Mechanisms linked to soil processes may explain the importance of previous-Autumn conditions on productivity. We further find that peak productivity increases in these Arctic peatlands are comparable to those in the surrounding non-peatland-dominant vegetation. Increased productivity in and around Arctic peatlands suggests a potential to increased soil carbon sequestration with future warming, but further work is needed to test whether this is evident in observations of recent peat accumulation and extent.
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Affiliation(s)
| | - Karen Anderson
- Department of Geography, University of Exeter, Exeter, UK
| | - Dan J Charman
- Department of Geography, University of Exeter, Exeter, UK
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5
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Boyle JS, Angers-Blondin S, Assmann JJ, Myers-Smith IH. Summer temperature—but not growing season length—influences radial growth of Salix arctica in coastal Arctic tundra. Polar Biol 2022. [DOI: 10.1007/s00300-022-03074-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
AbstractArctic climate change is leading to an advance of plant phenology (the timing of life history events) with uncertain impacts on tundra ecosystems. Although the lengthening of the growing season is thought to lead to increased plant growth, we have few studies of how plant phenology change is altering tundra plant productivity. Here, we test the correspondence between 14 years of Salix arctica phenology data and radial growth on Qikiqtaruk–Herschel Island, Yukon Territory, Canada. We analysed stems from 28 individuals using dendroecology and linear mixed-effect models to test the statistical power of growing season length and climate variables to individually predict radial growth. We found that summer temperature best explained annual variation in radial growth. We found no strong evidence that leaf emergence date, earlier leaf senescence date, or total growing season length had any direct or lagged effects on radial growth. Radial growth was also not explained by interannual variation in precipitation, MODIS surface greenness (NDVI), or sea ice concentration. Our results demonstrate that at this site, for the widely distributed species S. arctica, temperature—but not growing season length—influences radial growth. These findings challenge the assumption that advancing phenology and longer growing seasons will increase the productivity of all plant species in Arctic tundra ecosystems.
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6
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Climate-related drivers of nutrient inputs and food web structure in shallow Arctic lake ecosystems. Sci Rep 2022; 12:2125. [PMID: 35136177 PMCID: PMC8825857 DOI: 10.1038/s41598-022-06136-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 01/12/2022] [Indexed: 11/08/2022] Open
Abstract
In order to predict the effects of climate change on polar ecosystems, disentangling mechanisms of nutrient transfer in food webs is crucial. We investigated sources of nutrients in tundra lakes, tracing their transfer through the food web and relating the observed patterns to runoff, snow coverage, and the presence of migratory geese in lake catchments. C and N content (elemental and isotopic) of several food web components including Lepidurus arcticus (Notostraca, at the top of the lake food webs) in 18 shallow Arctic lakes was compared. Terrestrial productivity and geese abundance were key biotic factors that interacted with abiotic variables (snow coverage, lake and catchment size) in determining the amount and origin of nutrient inputs, affecting the trophic interactions among aquatic species, food chain length and nutrient flow in Arctic lake food webs. Decreasing snow coverage, increasing abundance and expansion of the geese's range are expected across the Arctic due to climate warming. By relating nutrient inputs and food web structure to snow coverage, vegetation and geese, this study contributes to our mechanistic understanding of the cascade effects of climate change in tundra ecosystems, and may help predict the response of lakes to changes in nutrient inputs at lower latitudes.
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7
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Wang J, Li M, Yu C, Fu G. The Change in Environmental Variables Linked to Climate Change Has a Stronger Effect on Aboveground Net Primary Productivity Than Does Phenological Change in Alpine Grasslands. FRONTIERS IN PLANT SCIENCE 2022; 12:798633. [PMID: 35058958 PMCID: PMC8763838 DOI: 10.3389/fpls.2021.798633] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 11/25/2021] [Indexed: 06/14/2023]
Abstract
More and more studies have focused on responses of ecosystem carbon cycling to climate change and phenological change, and aboveground net primary productivity (ANPP) is a primary component of global carbon cycling. However, it remains unclear whether the climate change or the phenological change has stronger effects on ANPP. In this study, we compared the effects of phenological change and climate change on ANPP during 2000-2013 across 36 alpine grassland sites on the Tibetan Plateau. Our results indicated that ANPP showed a positive relationship with plant phenology such as prolonged length of growing season and advanced start of growing season, and environmental variables such as growing season precipitation (GSP), actual vapor pressure (Ea), relative humidity (RH), and the ratio of GSP to ≥5°C accumulated temperature (GSP/AccT), respectively. The linear change trend of ANPP increased with that of GSP, Ea, RH, and GSP/AccT rather than phenology variables. Interestingly, GSP had the closer correlation with ANPP and meanwhile the linear slope of GSP had the closer correlation with that of ANPP among all the concerned variables. Therefore, climate change, mainly attributed to precipitation change, had a stronger effect on ANPP than did phenological change in alpine grasslands on the Tibetan Plateau.
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Affiliation(s)
- Jiangwei Wang
- Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Meng Li
- School of Geographic Sciences, Nantong University, Nantong, China
| | - Chengqun Yu
- Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
| | - Gang Fu
- Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
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8
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Duncan RJ, Andrew ME, Forchhammer MC. Snow mediates climatic impacts on Arctic herbivore populations. Polar Biol 2021. [DOI: 10.1007/s00300-021-02871-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AbstractArctic ecosystems are particularly vulnerable to impacts of climate change; however, the complex relationships between climate and ecosystems make incorporating effects of climate change into population management difficult. This study used structural equation modelling (SEM) and a 24-year multifaceted monitoring data series collected at Zackenberg, North-East Greenland, to untangle the network of climatic and local abiotic and biotic drivers, determining their direct and indirect effects on two herbivores: musk ox (Ovibos moschatus) and collared lemming (Dicrostonyx groenlandicus). Snow conditions were determined to be the central driver within the system, mediating the effects of climate on herbivore abundance. Under current climate change projections, snow is expected to decrease in the region. Snow had an indirect negative effect on musk ox, as decreased snow depth led to an earlier start to the Arctic willow growing season, shown to increase fecundity and decrease mortality. Musk ox are therefore expected to be more successful under future conditions, within a certain threshold. Snow had both positive and negative effects on lemming, with lemming expected to ultimately be less successful under climate change, as reduction in snow increases their vulnerability to predation. Through their capacity to determine effects of climatic and local drivers within a hierarchy, and the relative strength and direction of these effects, SEMs were demonstrated to have the potential to be valuable in guiding population management.
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9
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Kelsey KC, Pedersen SH, Leffler AJ, Sexton JO, Feng M, Welker JM. Winter snow and spring temperature have differential effects on vegetation phenology and productivity across Arctic plant communities. GLOBAL CHANGE BIOLOGY 2021; 27:1572-1586. [PMID: 33372357 DOI: 10.1111/gcb.15505] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 11/21/2020] [Accepted: 12/17/2020] [Indexed: 05/22/2023]
Abstract
Tundra dominates two-thirds of the unglaciated, terrestrial Arctic. Although this region has experienced rapid and widespread changes in vegetation phenology and productivity over the last several decades, the specific climatic drivers responsible for this change remain poorly understood. Here we quantified the effect of winter snowpack and early spring temperature conditions on growing season vegetation phenology (timing of the start, peak, and end of the growing season) and productivity of the dominant tundra vegetation communities of Arctic Alaska. We used daily remotely sensed normalized difference vegetation index (NDVI), and daily snowpack and temperature variables produced by SnowModel and MicroMet, coupled physically based snow and meteorological modeling tools, to (1) determine the most important snowpack and thermal controls on tundra vegetation phenology and productivity and (2) describe the direction of these relationships within each vegetation community. Our results show that soil temperature under the snowpack, snowmelt timing, and air temperature following snowmelt are the most important drivers of growing season timing and productivity among Arctic vegetation communities. Air temperature after snowmelt was the most important control on timing of season start and end, with warmer conditions contributing to earlier phenology in all vegetation communities. In contrast, the controls on the timing of peak season and productivity also included snowmelt timing and soil temperature under the snowpack, dictated in part by the snow insulating capacity. The results of this novel analysis suggest that while future warming effects on phenology may be consistent across communities of the tundra biome, warming may result in divergent, community-specific productivity responses if coupled with reduced snow insulating capacity lowers winter soil temperature and potential nutrient cycling in the soil.
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Affiliation(s)
- Katharine C Kelsey
- Department of Geography and Environmental Science, University of Colorado Denver, Denver, CO, USA
| | - Stine Højlund Pedersen
- Cooperative Institute for Research in the Atmosphere, Colorado State University, Ft. Collins, CO, USA
- Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK, USA
| | - A Joshua Leffler
- Department of Natural Resource Management, South Dakota State University, Brookings, SD, USA
| | | | - Min Feng
- terraPulse, Inc, Gaithersburg, MD, USA
| | - Jeffrey M Welker
- Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK, USA
- Ecology and Genetics Research Unit, University of Oulu, Oulu, Finland
- University of the Arctic-UArctic, Rovaniemi, Finland
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10
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Morozumi T, Sugimoto A, Suzuki R, Nagai S, Kobayashi H, Tei S, Takano S, Shakhmatov R, Maximov T. Photographic records of plant phenology and spring river flush timing in a river lowland ecosystem at the taiga–tundra boundary, northeastern Siberia. Ecol Res 2020. [DOI: 10.1111/1440-1703.12107] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Tomoki Morozumi
- Graduate School of Environmental Science Hokkaido University Sapporo Japan
- Arctic Research Center Hokkaido University Sapporo Japan
| | - Atsuko Sugimoto
- Arctic Research Center Hokkaido University Sapporo Japan
- Global Station for Arctic Research Global Institution for Collaborative Research and Education, Hokkaido University Sapporo Japan
| | - Rikie Suzuki
- Institute of Arctic Climate and Environment Research Research Institute for Global Change, Japan Agency for Marine‐Earth Science and Technology Yokohama Japan
| | - Shin Nagai
- Institute of Arctic Climate and Environment Research Research Institute for Global Change, Japan Agency for Marine‐Earth Science and Technology Yokohama Japan
- Earth Surface System Research Center Research Institute for Global Change, Japan Agency for Marine‐Earth Science and Technology Yokohama Japan
| | - Hideki Kobayashi
- Institute of Arctic Climate and Environment Research Research Institute for Global Change, Japan Agency for Marine‐Earth Science and Technology Yokohama Japan
| | - Shunsuke Tei
- Arctic Research Center Hokkaido University Sapporo Japan
| | - Shinya Takano
- Graduate School of Environmental Science Hokkaido University Sapporo Japan
- Arctic Research Center Hokkaido University Sapporo Japan
| | - Ruslan Shakhmatov
- Graduate School of Environmental Science Hokkaido University Sapporo Japan
| | - Trofim Maximov
- Institute for Biological Problems of the Cryolithozone Siberian Division of Russian Academy of Sciences Yakutsk Russia
- North Eastern Federal University Yakutsk Russia
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11
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Experimentally warmer and drier conditions in an Arctic plant community reveal microclimatic controls on senescence. Ecosphere 2019. [DOI: 10.1002/ecs2.2677] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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12
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Myers‐Smith IH, Grabowski MM, Thomas HJD, Angers‐Blondin S, Daskalova GN, Bjorkman AD, Cunliffe AM, Assmann JJ, Boyle JS, McLeod E, McLeod S, Joe R, Lennie P, Arey D, Gordon RR, Eckert CD. Eighteen years of ecological monitoring reveals multiple lines of evidence for tundra vegetation change. ECOL MONOGR 2019. [DOI: 10.1002/ecm.1351] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Isla H. Myers‐Smith
- School of GeoSciences University of Edinburgh Edinburgh EH9 3FF United Kingdom
| | | | - Haydn J. D. Thomas
- School of GeoSciences University of Edinburgh Edinburgh EH9 3FF United Kingdom
| | | | | | - Anne D. Bjorkman
- School of GeoSciences University of Edinburgh Edinburgh EH9 3FF United Kingdom
- Section for Ecoinformatics & Biodiversity Department of Bioscience Aarhus University DK‐8000 Aarhus Denmark
| | - Andrew M. Cunliffe
- School of GeoSciences University of Edinburgh Edinburgh EH9 3FF United Kingdom
| | - Jakob J. Assmann
- School of GeoSciences University of Edinburgh Edinburgh EH9 3FF United Kingdom
| | - Joseph S. Boyle
- School of GeoSciences University of Edinburgh Edinburgh EH9 3FF United Kingdom
| | - Edward McLeod
- Department of Environment Yukon Parks–Inuvik Office Yukon Territorial Government Inuvik NWT X0E 0T0 Canada
| | - Samuel McLeod
- Department of Environment Yukon Parks–Inuvik Office Yukon Territorial Government Inuvik NWT X0E 0T0 Canada
| | - Ricky Joe
- Department of Environment Yukon Parks–Inuvik Office Yukon Territorial Government Inuvik NWT X0E 0T0 Canada
| | - Paden Lennie
- Department of Environment Yukon Parks–Inuvik Office Yukon Territorial Government Inuvik NWT X0E 0T0 Canada
| | - Deon Arey
- Department of Environment Yukon Parks–Inuvik Office Yukon Territorial Government Inuvik NWT X0E 0T0 Canada
| | - Richard R. Gordon
- Department of Environment Yukon Parks–Inuvik Office Yukon Territorial Government Inuvik NWT X0E 0T0 Canada
| | - Cameron D. Eckert
- Department of Environment Yukon Parks–Whitehorse Office Yukon Territorial Government Whitehorse Yukon Territory Y1A 2C6 Canada
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13
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14
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Klosterman S, Hufkens K, Richardson AD. Later springs green-up faster: the relation between onset and completion of green-up in deciduous forests of North America. INTERNATIONAL JOURNAL OF BIOMETEOROLOGY 2018; 62:1645-1655. [PMID: 29855702 DOI: 10.1007/s00484-018-1564-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 04/15/2018] [Accepted: 05/16/2018] [Indexed: 05/25/2023]
Abstract
In deciduous forests, spring leaf phenology controls the onset of numerous ecosystem functions. While most studies have focused on a single annual spring event, such as budburst, ecosystem functions like photosynthesis and transpiration increase gradually after budburst, as leaves grow to their mature size. Here, we examine the "velocity of green-up," or duration between budburst and leaf maturity, in deciduous forest ecosystems of eastern North America. We use a diverse data set that includes 301 site-years of phenocam data across a range of sites, as well as 22 years of direct ground observations of individual trees and 3 years of fine-scale high-frequency aerial photography, both from Harvard Forest. We find a significant association between later start of spring and faster green-up: - 0.47 ± 0.04 (slope ± 1 SE) days change in length of green-up for every day later start of spring within phenocam sites, - 0.31 ± 0.06 days/day for trees under direct observation, and - 1.61 ± 0.08 days/day spatially across fine-scale landscape units. To explore the climatic drivers of spring leaf development, we fit degree-day models to the observational data from Harvard Forest. We find that the default phenology parameters of the ecosystem model PnET make biased predictions of leaf initiation (39 days early) and maturity (13 days late) for red oak, while the optimized model has biases of 1 day or less. Springtime productivity predictions using optimized parameters are closer to results driven by observational data (within 1%) than those of the default parameterization (17% difference). Our study advances empirical understanding of the link between early and late spring phenophases and demonstrates that accurately modeling these transitions is important for simulating seasonal variation in ecosystem productivity.
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Affiliation(s)
- Stephen Klosterman
- Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford St, Cambridge, MA, 02138, USA.
| | - Koen Hufkens
- Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford St, Cambridge, MA, 02138, USA
- UMR 1391 ISPA - Interactions Sol Plante Atmosphère, INRA, 71 Avenue Edouard Bourlaux, 33140, Villenave D'Ornon, France
- Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
| | - Andrew D Richardson
- Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford St, Cambridge, MA, 02138, USA
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, PO Box 5693, Flagstaff, AZ, 86011, USA
- Center for Ecosystem Science and Society, Northern Arizona University, P.O. Box 5620, Flagstaff, AZ, 86011, USA
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15
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Liu Z, An S, Lu X, Hu H, Tang J. Using canopy greenness index to identify leaf ecophysiological traits during the foliar senescence in an oak forest. Ecosphere 2018. [DOI: 10.1002/ecs2.2337] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Zhunqiao Liu
- School of Life Sciences; Nanjing University; Nanjing Jiangsu 210037 China
- The Ecosystems Center; Marine Biological Laboratory; Woods Hole Massachusetts 02543 USA
| | - Shuqing An
- School of Life Sciences; Nanjing University; Nanjing Jiangsu 210037 China
| | - Xiaoliang Lu
- The Ecosystems Center; Marine Biological Laboratory; Woods Hole Massachusetts 02543 USA
- Department of Forest Ecosystems and Society; Oregon State University; Corvallis Oregon 97331 USA
| | - Haibo Hu
- Collaborative Innovation Center of the Southern Modern Forestry; Nanjing Forestry University; Nanjing 210037 China
| | - Jianwu Tang
- The Ecosystems Center; Marine Biological Laboratory; Woods Hole Massachusetts 02543 USA
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16
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Pedersen SH, Liston GE, Tamstorf MP, Abermann J, Lund M, Schmidt NM. Quantifying snow controls on vegetation greenness. Ecosphere 2018. [DOI: 10.1002/ecs2.2309] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Stine Højlund Pedersen
- Arctic Research Centre Department of Bioscience Aarhus University Frederiksborgvej 399 DK‐4000 Roskilde Denmark
- Cooperative Institute for Research in the Atmosphere (CIRA) Colorado State University Fort Collins Colorado 80523 USA
| | - Glen E. Liston
- Cooperative Institute for Research in the Atmosphere (CIRA) Colorado State University Fort Collins Colorado 80523 USA
| | - Mikkel P. Tamstorf
- Arctic Research Centre Department of Bioscience Aarhus University Frederiksborgvej 399 DK‐4000 Roskilde Denmark
| | - Jakob Abermann
- Asiaq Greenland Survey Qatserisut 8 GL‐3900 Nuuk Greenland
| | - Magnus Lund
- Arctic Research Centre Department of Bioscience Aarhus University Frederiksborgvej 399 DK‐4000 Roskilde Denmark
| | - Niels Martin Schmidt
- Arctic Research Centre Department of Bioscience Aarhus University Frederiksborgvej 399 DK‐4000 Roskilde Denmark
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17
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Blok D, Faucherre S, Banyasz I, Rinnan R, Michelsen A, Elberling B. Contrasting above- and belowground organic matter decomposition and carbon and nitrogen dynamics in response to warming in High Arctic tundra. GLOBAL CHANGE BIOLOGY 2018; 24:2660-2672. [PMID: 29235209 DOI: 10.1111/gcb.14017] [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: 06/13/2017] [Accepted: 11/29/2017] [Indexed: 06/07/2023]
Abstract
Tundra regions are projected to warm rapidly during the coming decades. The tundra biome holds the largest terrestrial carbon pool, largely contained in frozen permafrost soils. With warming, these permafrost soils may thaw and become available for microbial decomposition, potentially providing a positive feedback to global warming. Warming may directly stimulate microbial metabolism but may also indirectly stimulate organic matter turnover through increased plant productivity by soil priming from root exudates and accelerated litter turnover rates. Here, we assess the impacts of experimental warming on turnover rates of leaf litter, active layer soil and thawed permafrost sediment in two high-arctic tundra heath sites in NE-Greenland, either dominated by evergreen or deciduous shrubs. We incubated shrub leaf litter on the surface of control and warmed plots for 1 and 2 years. Active layer soil was collected from the plots to assess the effects of 8 years of field warming on soil carbon stocks. Finally, we incubated open cores filled with newly thawed permafrost soil for 2 years in the active layer of the same plots. After field incubation, we measured basal respiration rates of recovered thawed permafrost cores in the lab. Warming significantly reduced litter mass loss by 26% after 1 year incubation, but differences in litter mass loss among treatments disappeared after 2 years incubation. Warming also reduced litter nitrogen mineralization and decreased the litter carbon to nitrogen ratio. Active layer soil carbon stocks were reduced 15% by warming, while soil dissolved nitrogen was reduced by half in warmed plots. Warming had a positive legacy effect on carbon turnover rates in thawed permafrost cores, with 10% higher respiration rates measured in cores from warmed plots. These results demonstrate that warming may have contrasting effects on above- and belowground tundra carbon turnover, possibly governed by microbial resource availability.
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Affiliation(s)
- Daan Blok
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
- Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
| | - Samuel Faucherre
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
| | - Imre Banyasz
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
| | - Riikka Rinnan
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Anders Michelsen
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Bo Elberling
- Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
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18
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Gustine D, Barboza P, Adams L, Griffith B, Cameron R, Whitten K. Advancing the match-mismatch framework for large herbivores in the Arctic: Evaluating the evidence for a trophic mismatch in caribou. PLoS One 2017; 12:e0171807. [PMID: 28231256 PMCID: PMC5322966 DOI: 10.1371/journal.pone.0171807] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Accepted: 01/26/2017] [Indexed: 11/17/2022] Open
Abstract
Climate-induced shifts in plant phenology may adversely affect animals that cannot or do not shift the timing of their reproductive cycle. The realized effect of potential trophic "mismatches" between a consumer and its food varies with the degree to which species rely on dietary income and stored capital. Large Arctic herbivores rely heavily on maternal capital to reproduce and give birth near the onset of the growing season but are they vulnerable to trophic mismatch? We evaluated the long-term changes in the temperatures and characteristics of the growing seasons (1970-2013), and compared growing conditions and dynamics of forage quality for caribou at peak parturition, peak lactation, and peak forage biomass, and plant senescence between two distinct time periods over 36 years (1977 and 2011-13). Despite advanced thaw dates (7-12 days earlier), increased growing season lengths (15-21 days longer), and consistent parturition dates, we found no decline in forage quality and therefore no evidence within this dataset for a trophic mismatch at peak parturition or peak lactation from 1977 to 2011-13. In Arctic ungulates that use stored capital for reproduction, reproductive demands are largely met by body stores deposited in the previous summer and autumn, which reduces potential adverse effects of any mismatch between food availability and timing of parturition. Climate-induced effects on forages growing in the summer and autumn ranges, however, do correspond with the demands of female caribou and their offspring to gain mass for the next reproductive cycle and winter. Therefore, we suggest the window of time to examine the match-mismatch framework in Arctic ungulates is not at parturition but in late summer-autumn, where the multiplier effects of small changes in forage quality are amplified by forage abundance, peak forage intake, and resultant mass gains in mother-offspring pairs.
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Affiliation(s)
- David Gustine
- U.S. Geological Survey, Alaska Science Center, Anchorage, Alaska, United States of America
| | - Perry Barboza
- Wildlife and Fisheries Science, Texas A&M University, College Station, Texas, United States of America
| | - Layne Adams
- U.S. Geological Survey, Alaska Science Center, Anchorage, Alaska, United States of America
| | - Brad Griffith
- U.S. Geological Survey, Alaska Cooperative Fish and Wildlife Research Unit, University of Alaska Fairbanks, Fairbanks, Alaska, United States of America
| | - Raymond Cameron
- Alaska Department of Fish and Game, Fairbanks, Alaska, United States of America
| | - Kenneth Whitten
- Alaska Department of Fish and Game, Fairbanks, Alaska, United States of America
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19
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Citterio M, Sejr MK, Langen PL, Mottram RH, Abermann J, Hillerup Larsen S, Skov K, Lund M. Towards quantifying the glacial runoff signal in the freshwater input to Tyrolerfjord-Young Sound, NE Greenland. AMBIO 2017; 46:146-159. [PMID: 28116690 PMCID: PMC5258666 DOI: 10.1007/s13280-016-0876-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Terrestrial freshwater runoff strongly influences physical and biogeochemical processes at the fjord scale and can have global impacts when considered at the Greenland scale. We investigate the performance of the HIRHAM5 regional climate model over the catchments delivering freshwater to Tyrolerfjord and Young Sound by comparing to the unique Greenland Ecological Monitoring database of in situ observations from this region. Based on these findings, we estimate and discuss the fraction of runoff originating from glacierized and non-glacierized land delivered at the daily scale between 1996 and 2008. We find that glaciers contributed on average 50-80% of annual terrestrial runoff when considering different sections of Tyrolerfjord-Young Sound, but snowpack depletion on land and consequently runoff happens about one month earlier in the model than observed in the field. The temporal shift in the model is a likely explanation why summer surface salinity in the inner fjord did not correlate to modelled runoff.
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Affiliation(s)
- Michele Citterio
- Glaciology and Climate Department, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, 1350 Copenhagen K, Denmark
| | - Mikael K. Sejr
- Arctic Research Centre, Aarhus University, Ny Munkegade bldg. 1540, 8000 Aarhus C, Denmark
| | - Peter L. Langen
- Danish Meteorological Institute (DMI), Lyngbyvej 100, 2100 Copenhagen Ø, Denmark
| | - Ruth H. Mottram
- Danish Meteorological Institute (DMI), Lyngbyvej 100, 2100 Copenhagen Ø, Denmark
| | - Jakob Abermann
- Asiaq Greenland Survey, Qatserisut 8, 3900 Nuuk, Greenland
| | - Signe Hillerup Larsen
- Glaciology and Climate Department, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, 1350 Copenhagen K, Denmark
| | - Kirstine Skov
- Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen K, Denmark
| | - Magnus Lund
- Department of Bioscience, Arctic Research Centre, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
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