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1. Winters are changing:snow effects on Arctic and alpine tundra ecosystems

Author

Rixen, C. (Christian), Høye, T. T. (Toke Thomas), Macek, P. (Petr), Aerts, R. (Rien), Alatalo, J. M. (Juha M.), Anderson, J. T. (Jill T.), Arnold, P. A. (Pieter A.), Barrio, I. C. (Isabel C), Bjerke, J. W. (Jarle W.), Björkman, M. P. (Mats P.), Blok, D. (Daan), Blume-Werry, G. (Gesche), Boike, J. (Julia), Bokhorst, S. (Stef), Carbognani, M. (Michele), Christiansen, C. T. (Casper T.), Convey, P. (Peter), Cooper, E. J. (Elisabeth J.), Cornelissen, J. H. (J. Hans C.), Coulson, S. J. (Stephen J.), Dorrepaal, E. (Ellen), Elberling, B. (Bo), Elmendorf, S. C. (Sarah C.), Elphinstone, C. (Cassandra), Forte, T. G. (T’ai G.W.), Frei, E. R. (Esther R.), Geange, S. R. (Sonya R.), Gehrmann, F. (Friederike), Gibson, C. (Casey), Grogan, P. (Paul), Halbritter, A. H. (Aud Helen), Harte, J. (John), Henry, G. H. (Gregory H.R.), Inouye, D. W. (David W.), Irwin, R. E. (Rebecca E.), Jespersen, G. (Gus), Jónsdóttir, I. S. (Ingibjörg Svala), Jung, J. Y. (Ji Young), Klinges, D. H. (David H.), Kudo, G. (Gaku), Lämsä, J. (Juho), Lee, H. (Hanna), Lembrechts, J. J. (Jonas J.), Lett, S. (Signe), Lynn, J. S. (Joshua Scott), Mann, H. M. (Hjalte M.R.), Mastepanov, M. (Mikhail), Morse, J. (Jennifer), Myers-Smith, I. H. (Isla H.), Olofsson, J. (Johan), Paavola, R. (Riku), Petraglia, A. (Alessandro), Phoenix, G. K. (Gareth K.), Semenchuk, P. (Philipp), Siewert, M. B. (Matthias B.), Slatyer, R. (Rachel), Spasojevic, M. J. (Marko J.), Suding, K. (Katharine), Sullivan, P. (Patrick), Thompson, K. L. (Kimberly L.), Väisänen, M. (Maria), Vandvik, V. (Vigdis), Venn, S. (Susanna), Walz, J. (Josefine), Way, R. (Robert), Welker, J. M. (Jeffrey M.), Wipf, S. (Sonja), Zong, S. (Shengwei), Rixen, C. (Christian), Høye, T. T. (Toke Thomas), Macek, P. (Petr), Aerts, R. (Rien), Alatalo, J. M. (Juha M.), Anderson, J. T. (Jill T.), Arnold, P. A. (Pieter A.), Barrio, I. C. (Isabel C), Bjerke, J. W. (Jarle W.), Björkman, M. P. (Mats P.), Blok, D. (Daan), Blume-Werry, G. (Gesche), Boike, J. (Julia), Bokhorst, S. (Stef), Carbognani, M. (Michele), Christiansen, C. T. (Casper T.), Convey, P. (Peter), Cooper, E. J. (Elisabeth J.), Cornelissen, J. H. (J. Hans C.), Coulson, S. J. (Stephen J.), Dorrepaal, E. (Ellen), Elberling, B. (Bo), Elmendorf, S. C. (Sarah C.), Elphinstone, C. (Cassandra), Forte, T. G. (T’ai G.W.), Frei, E. R. (Esther R.), Geange, S. R. (Sonya R.), Gehrmann, F. (Friederike), Gibson, C. (Casey), Grogan, P. (Paul), Halbritter, A. H. (Aud Helen), Harte, J. (John), Henry, G. H. (Gregory H.R.), Inouye, D. W. (David W.), Irwin, R. E. (Rebecca E.), Jespersen, G. (Gus), Jónsdóttir, I. S. (Ingibjörg Svala), Jung, J. Y. (Ji Young), Klinges, D. H. (David H.), Kudo, G. (Gaku), Lämsä, J. (Juho), Lee, H. (Hanna), Lembrechts, J. J. (Jonas J.), Lett, S. (Signe), Lynn, J. S. (Joshua Scott), Mann, H. M. (Hjalte M.R.), Mastepanov, M. (Mikhail), Morse, J. (Jennifer), Myers-Smith, I. H. (Isla H.), Olofsson, J. (Johan), Paavola, R. (Riku), Petraglia, A. (Alessandro), Phoenix, G. K. (Gareth K.), Semenchuk, P. (Philipp), Siewert, M. B. (Matthias B.), Slatyer, R. (Rachel), Spasojevic, M. J. (Marko J.), Suding, K. (Katharine), Sullivan, P. (Patrick), Thompson, K. L. (Kimberly L.), Väisänen, M. (Maria), Vandvik, V. (Vigdis), Venn, S. (Susanna), Walz, J. (Josefine), Way, R. (Robert), Welker, J. M. (Jeffrey M.), Wipf, S. (Sonja), and Zong, S. (Shengwei)

Abstract

Snow is an important driver of ecosystem processes in cold biomes. Snow accumulation determines ground temperature, light conditions, and moisture availability during winter. It also affects the growing season’s start and end, and plant access to moisture and nutrients. Here, we review the current knowledge of the snow cover’s role for vegetation, plant-animal interactions, permafrost conditions, microbial processes, and biogeochemical cycling. We also compare studies of natural snow gradients with snow experimental manipulation studies to assess time scale difference of these approaches. The number of tundra snow studies has increased considerably in recent years, yet we still lack a comprehensive overview of how altered snow conditions will affect these ecosystems. Specifically, we found a mismatch in the timing of snowmelt when comparing studies of natural snow gradients with snow manipulations. We found that snowmelt timing achieved by snow addition and snow removal manipulations (average 7.9 days advance and 5.5 days delay, respectively) were substantially lower than the temporal variation over natural spatial gradients within a given year (mean range 56 days) or among years (mean range 32 days). Differences between snow study approaches need to be accounted for when projecting snow dynamics and their impact on ecosystems in future climates.

Published
2022

2. Stomping in silence:conceptualizing trampling effects on soils in polar tundra

Author

Tuomi, M. (Maria), Väisänen, M. (Maria), Ylänne, H. (Henni), Brearley, F. Q. (Francis Q.), Barrio, I. C. (Isabel C.), Bråthen, K. A. (Kari Anne), Eischeid, I. (Isabell), Forbes, B. C. (Bruce C.), Jónsdóttir, I. S. (Ingibjörg S.), Kolstad, A. L. (Anders L.), Macek, P. (Petr), Petit Bon, M. (Matteo), Speed, J. D. (James D. M.), Stark, S. (Sari), Svavarsdóttir, K. (Kristin), Thórsson, J. (Jóhann), and Bueno, C. G. (C. Guillermo)

Subjects
Arctic ecosystems, herbivory, non‐trophic interactions, physical disturbance, grazing, herbivore–soil interactions, treading
Abstract

1. Ungulate trampling modifies soils and interlinked ecosystem functions across biomes. Until today, most research has focused on temperate ecosystems and mineral soils while trampling effects on cold and organic matter‐rich tundra soils remain largely unknown. 2. We aimed to develop a general model of trampling effects on soil structure, biota, microclimate and biogeochemical processes, with a particular focus on polar tundra soils. To reach this goal, we reviewed literature about the effects of trampling and physical disturbances on soils across biomes and used this to discuss the knowns and unknowns of trampling effects on tundra soils. 3. We identified the following four pathways through which trampling affects soils: (a) soil compaction; (b) reductions in soil fauna and fungi; (c) rapid losses in vegetation biomass and cover; and (d) longer term shifts in vegetation community composition. 4. We found that, in polar tundra, soil responses to trampling pathways 1 and 3 could be characterized by nonlinear dynamics and tundra‐specific context dependencies that we formulated into testable hypotheses. 5. In conclusion, trampling may affect tundra soil significantly but many direct, interacting and cascading responses remain unknown. We call for research to advance the understanding of trampling effects on soils to support informed efforts to manage and predict the functioning of tundra systems under global changes.

Published
2021

3. Tundra Trait Team:a database of plant traits spanning the tundra biome

Author

Bjorkman, A. D. (Anne D.), Myers-Smith, I. H. (Isla H.), Elmendorf, S. C. (Sarah C.), Normand, S. (Signe), Thomas, H. J. (Haydn J. D.), Alatalo, J. M. (Juha M.), Alexander, H. (Heather), Anadon-Rosell, A. (Alba), Angers-Blondin, S. (Sandra), Bai, Y. (Yang), Baruah, G. (Gaurav), te Beest, M. (Mariska), Berner, L. (Logan), Bjork, R. G. (Robert G.), Blok, D. (Daan), Bruelheide, H. (Helge), Buchwal, A. (Agata), Buras, A. (Allan), Carbognani, M. (Michele), Christie, K. (Katherine), Collier, L. S. (Laura S.), Cooper, E. J. (Elisabeth J.), Cornelissen, J. H. (J. Hans C.), Dickinson, K. J. (Katharine J. M.), Dullinger, S. (Stefan), Elberling, B. (Bo), Eskelinen, A. (Anu), Forbes, B. C. (Bruce C.), Frei, E. R. (Esther R.), Iturrate-Garcia, M. (Maitane), Good, M. K. (Megan K.), Grau, O. (Oriol), Green, P. (Peter), Greve, M. (Michelle), Grogan, P. (Paul), Haider, S. (Sylvia), Hajek, T. (Tomas), Hallinger, M. (Martin), Happonen, K. (Konsta), Harper, K. A. (Karen A.), Heijmans, M. M. (Monique M. P. D.), Henry, G. H. (Gregory H. R.), Hermanutz, L. (Luise), Hewitt, R. E. (Rebecca E.), Hollister, R. D. (Robert D.), Hudson, J. (James), Huelber, K. (Karl), Iversen, C. M. (Colleen M.), Jaroszynska, F. (Francesca), Jimenez-Alfaro, B. (Borja), Johnstone, J. (Jill), Jorgensen, R. H. (Rasmus Halfdan), Kaarlejarvi, E. (Elina), Klady, R. (Rebecca), Klimesova, J. (Jitka), Korsten, A. (Annika), Kuleza, S. (Sara), Kulonen, A. (Aino), Lamarque, L. J. (Laurent J.), Lantz, T. (Trevor), Lavalle, A. (Amanda), Lembrechts, J. J. (Jonas J.), Levesque, E. (Esther), Little, C. J. (Chelsea J.), Luoto, M. (Miska), Macek, P. (Petr), Mack, M. C. (Michelle C.), Mathakutha, R. (Rabia), Michelsen, A. (Anders), Milbau, A. (Ann), Molau, U. (Ulf), Morgan, J. W. (John W.), Morsdorf, M. A. (Martin Alfons), Nabe-Nielsen, J. (Jacob), Nielsen, S. S. (Sigrid Scholer), Ninot, J. M. (Josep M.), Oberbauer, S. F. (Steven F.), Olofsson, J. (Johan), Onipchenko, V. G. (Vladimir G.), Petraglia, A. (Alessandro), Pickering, C. (Catherine), Prevey, J. S. (Janet S.), Rixen, C. (Christian), Rumpf, S. B. (Sabine B.), Schaepman-Strub, G. (Gabriela), Semenchuk, P. (Philipp), Shetti, R. (Rohan), Soudzilovskaia, N. A. (Nadejda A.), Spasojevic, M. J. (Marko J.), Speed, J. D. (James David Mervyn), Street, L. E. (Lorna E.), Suding, K. (Katharine), Tape, K. D. (Ken D.), Tomaselli, M. (Marcello), Trant, A. (Andrew), Treier, U. A. (Urs A.), Tremblay, J.-P. (Jean-Pierre), Tremblay, M. (Maxime), Venn, S. (Susanna), Virkkala, A.-M. (Anna-Maria), Vowles, T. (Tage), Weijers, S. (Stef), Wilmking, M. (Martin), Wipf, S. (Sonja), Zamin, T. (Tara), Bjorkman, A. D. (Anne D.), Myers-Smith, I. H. (Isla H.), Elmendorf, S. C. (Sarah C.), Normand, S. (Signe), Thomas, H. J. (Haydn J. D.), Alatalo, J. M. (Juha M.), Alexander, H. (Heather), Anadon-Rosell, A. (Alba), Angers-Blondin, S. (Sandra), Bai, Y. (Yang), Baruah, G. (Gaurav), te Beest, M. (Mariska), Berner, L. (Logan), Bjork, R. G. (Robert G.), Blok, D. (Daan), Bruelheide, H. (Helge), Buchwal, A. (Agata), Buras, A. (Allan), Carbognani, M. (Michele), Christie, K. (Katherine), Collier, L. S. (Laura S.), Cooper, E. J. (Elisabeth J.), Cornelissen, J. H. (J. Hans C.), Dickinson, K. J. (Katharine J. M.), Dullinger, S. (Stefan), Elberling, B. (Bo), Eskelinen, A. (Anu), Forbes, B. C. (Bruce C.), Frei, E. R. (Esther R.), Iturrate-Garcia, M. (Maitane), Good, M. K. (Megan K.), Grau, O. (Oriol), Green, P. (Peter), Greve, M. (Michelle), Grogan, P. (Paul), Haider, S. (Sylvia), Hajek, T. (Tomas), Hallinger, M. (Martin), Happonen, K. (Konsta), Harper, K. A. (Karen A.), Heijmans, M. M. (Monique M. P. D.), Henry, G. H. (Gregory H. R.), Hermanutz, L. (Luise), Hewitt, R. E. (Rebecca E.), Hollister, R. D. (Robert D.), Hudson, J. (James), Huelber, K. (Karl), Iversen, C. M. (Colleen M.), Jaroszynska, F. (Francesca), Jimenez-Alfaro, B. (Borja), Johnstone, J. (Jill), Jorgensen, R. H. (Rasmus Halfdan), Kaarlejarvi, E. (Elina), Klady, R. (Rebecca), Klimesova, J. (Jitka), Korsten, A. (Annika), Kuleza, S. (Sara), Kulonen, A. (Aino), Lamarque, L. J. (Laurent J.), Lantz, T. (Trevor), Lavalle, A. (Amanda), Lembrechts, J. J. (Jonas J.), Levesque, E. (Esther), Little, C. J. (Chelsea J.), Luoto, M. (Miska), Macek, P. (Petr), Mack, M. C. (Michelle C.), Mathakutha, R. (Rabia), Michelsen, A. (Anders), Milbau, A. (Ann), Molau, U. (Ulf), Morgan, J. W. (John W.), Morsdorf, M. A. (Martin Alfons), Nabe-Nielsen, J. (Jacob), Nielsen, S. S. (Sigrid Scholer), Ninot, J. M. (Josep M.), Oberbauer, S. F. (Steven F.), Olofsson, J. (Johan), Onipchenko, V. G. (Vladimir G.), Petraglia, A. (Alessandro), Pickering, C. (Catherine), Prevey, J. S. (Janet S.), Rixen, C. (Christian), Rumpf, S. B. (Sabine B.), Schaepman-Strub, G. (Gabriela), Semenchuk, P. (Philipp), Shetti, R. (Rohan), Soudzilovskaia, N. A. (Nadejda A.), Spasojevic, M. J. (Marko J.), Speed, J. D. (James David Mervyn), Street, L. E. (Lorna E.), Suding, K. (Katharine), Tape, K. D. (Ken D.), Tomaselli, M. (Marcello), Trant, A. (Andrew), Treier, U. A. (Urs A.), Tremblay, J.-P. (Jean-Pierre), Tremblay, M. (Maxime), Venn, S. (Susanna), Virkkala, A.-M. (Anna-Maria), Vowles, T. (Tage), Weijers, S. (Stef), Wilmking, M. (Martin), Wipf, S. (Sonja), and Zamin, T. (Tara)

Abstract

Motivation: The Tundra Trait Team (TTT) database includes field‐based measurements of key traits related to plant form and function at multiple sites across the tundra biome. This dataset can be used to address theoretical questions about plant strategy and trade‐offs, trait–environment relationships and environmental filtering, and trait variation across spatial scales, to validate satellite data, and to inform Earth system model parameters. Main types of variable contained: The database contains 91,970 measurements of 18 plant traits. The most frequently measured traits (> 1,000 observations each) include plant height, leaf area, specific leaf area, leaf fresh and dry mass, leaf dry matter content, leaf nitrogen, carbon and phosphorus content, leaf C:N and N:P, seed mass, and stem specific density. Spatial location and grain: Measurements were collected in tundra habitats in both the Northern and Southern Hemispheres, including Arctic sites in Alaska, Canada, Greenland, Fennoscandia and Siberia, alpine sites in the European Alps, Colorado Rockies, Caucasus, Ural Mountains, Pyrenees, Australian Alps, and Central Otago Mountains (New Zealand), and sub‐Antarctic Marion Island. More than 99% of observations are georeferenced. Time period and grain: All data were collected between 1964 and 2018. A small number of sites have repeated trait measurements at two or more time periods. Major taxa and level of measurement: Trait measurements were made on 978 terrestrial vascular plant species growing in tundra habitats. Most observations are on individuals (86%), while the remainder represent plot or site means or maximums per species. Software format: csv file and GitHub repository with data cleaning scripts in R; contribution to TRY plant trait database (www.try-db.org) to be included in the next version release.

Published
2018

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