Blar i NINA Brage på forfatter "Bokhorst, Stef"
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Changing Arctic snow cover: A review of recent developments and assessment of future needs for observations, modelling, and impacts
Bokhorst, Stef; Pedersen, Stine Højlund; Brucker, Ludovic; Anisimov, Oleg; Bjerke, Jarle W.; Brown, Ross D.; Ehrich, Dorothee (Journal article, 2016)Snow is a critically important and rapidly changing feature of the Arctic. However, snow-cover and snowpack conditions change through time pose challenges for measuring and prediction of snow. Plausible scenarios of ... -
Climatic and biotic extreme events moderate long-term responses of above- and belowground sub-Arctic heathland communities to climate change
Bokhorst, Stef; Phoenix, Gareth K.; Berg, Matty P.; Callaghan, Terry V.; Kirby-Lambert, Christopher; Bjerke, Jarle W. (Journal article; Peer reviewed, 2015)Climate change impacts are not uniform across the Arctic region because interacting factors causes large variations in local ecosystem change. Extreme climatic events and population cycles of herbivores occur simultaneously ... -
Contrasting survival and physiological responses of sub-Arctic plant types to extreme winter warming and nitrogen
Bokhorst, Stef; Jaakola, Laura; Karppinen, Katja; Edvinsen, Guro Kristine; Mæhre, Hanne Kirsti; Bjerke, Jarle W. (Journal article; Peer reviewed, 2017)Main conclusion Evergreen plants are more vulnerable than grasses and birch to snow and temperature variability in the sub-Arctic. Most Arctic climate impact studies focus on single factors, such as summer warming, while ... -
Decadal increases in carbon uptake offset by respiratory losses across northern permafrost ecosystems
See, Craig R.; Virkkala, Anna-Maria; Natali, Susan M.; Rogers, Brendan M.; Mauritz, Marguerite; Biasi, Christina; Bokhorst, Stef; Boike, Julia; Bret-Harte, M. Syndonia; Celis, Gerardo; Chae, Namyi; Christensen, Torben R.; Murner, Sara June; Dengel, Sigrid; Dolman, Han; Edgar, Colin W.; Elberling, Bo; Emmerton, Craig A.; Euskirchen, Eugénie S.; Göckede, Mathias; Grelle, Achim; Heffernan, Liam; Helbig, Manuel; Holl, David; Humphreys, Elyn; Iwata, Hiroki; Järveoja, Järvi; Kobayashi, Hideki; Kochendorfer, John; Kolari, Pasi; Kotani, Ayumi; Kutzbach, Lars; Kwon, Min Jung; Lathrop, Emma R.; López-Blanco, Efrén; Mammarella, Ivan; Marushchak, Maija E.; Mastepanov, Mikhail; Matsuura, Yojiro; Merbold, Lutz; Meyer, Gesa; Minions, Christina; Nilsson, Mats B.; Nojeim, Julia; Oberbauer, Steven F.; Olefeldt, David; Park, Sang-Jong; Parmentier, Frans-Jan W.; Peichl, Matthias; Peter, Darcy; Petrov, Roman; Poyatos, Rafael; Prokushkin, Anatoly S.; Quinton, William; Rodenhizer, Heidi; Sachs, Torsten; Savage, Kathleen; Schulze, Christopher; Sjögersten, Sofie; Sonnentag, Oliver; St. Louis, Vincent L.; Torn, Margaret S.; Tuittila, Eeva-Stiina; Ueyama, Masahito; Varlagin, Andrej; Voigt, Carolina; Watts, Jennifer D.; Zona, Donatella; Zyryanov, Viacheslav I.; Schuur, Edward A. G. (Peer reviewed; Journal article, 2024)Tundra and boreal ecosystems encompass the northern circumpolar permafrost region and are experiencing rapid environmental change with important implications for the global carbon (C) budget. We analysed multi-decadal time ... -
Ecosystem change and stability over multiple decades in the Swedish subarctic: complex processes and multiple drivers
Callaghan, Terry V.; Jonasson, Christer; Thierfelder, Tomas; Yang, Zhenlin; Hedenås, Henrik; Johansson, Margareta; Molau, Ulf; Van Bogaert, Rik; Michelsen, Anders; Olofsson, Johan; Gwynn-Jones, Dylan; Bokhorst, Stef; Phoenix, Gareth K.; Bjerke, Jarle Werner; Tømmervik, Hans; Christensen, Torben R.; Hanna, Edward; Koller, Eva K.; Sloan, Victoria L. (Journal article; Peer reviewed, 2013)The subarctic environment of northernmost Sweden has changed over the past century, particularly elements of climate and cryosphere. This paper presents a unique geo-referenced record of environmental and ecosystem ... -
Ecosystem response to climatic change: the importance of the cold season
Bokhorst, Stef; Bjerke, Jarle Werner; Tømmervik, Hans; Preece, Catherine; Phoenix, Gareth K. (Journal article; Peer reviewed, 2012)Winter climate and snow cover are the important drivers of plant community development in polar regions. However, the impacts of changing winter climate and associated changes in snow regime have received much less attention ... -
Impact of Multiple Ecological Stressors on a Sub-Arctic Ecosystem: No Interaction Between Extreme Winter Warming Events, Nitrogen Addition and Grazing
Bokhorst, Stef; Berg, atty P.; Edvinsen, Guri K.; Ellers, Jacintha; Heitman, Amber; Jaakola, Laura; Mæhre, Hanne K.; Phoenix, Gareth K.; Tømmervik, Hans; Bjerke, Jarle W. (Peer reviewed; Journal article, 2018)Climate change is one of many ongoing human-induced environmental changes, but few studies consider interactive effects between multiple anthropogenic disturbances. In coastal sub-arctic heathland, we quantified the ... -
Persistent reduction of segment growth and photosynthesis in a widespread and important sub-Arctic moss species after cessation of three years of experimental winter warming
Bjerke, Jarle W.; Bokhorst, Stef; Callaghan, Terry V.; Phoenix, Gareth K. (Journal article; Peer reviewed, 2017)1. Winter is a period of dormancy for plants of cold environments. However, winter climate is changing, leading to an increasing frequency of stochastic warm periods (winter warming events) and concomitant reductions in ... -
Stress-induced secondary leaves of a boreal deciduous shrub (Vaccinium myrtillus) overwinter then regain activity the following growing season
Bjerke, Jarle W.; Wierzbinski, Grzegorz; Tømmervik, Hans; Phoenix, Gareth K.; Bokhorst, Stef (Journal article; Peer reviewed, 2018)The ericoid shrub Vaccinium myrtillus is one of several deciduous boreal plants that respond to larval defoliation by compensatory production of a new set of leaves within the same growing season soon after defoliation. ... -
Sub-arctic mosses and lichens show idiosyncratic responses to combinations of winter heatwaves, freezing and nitrogen deposition
Bokhorst, Stef; Bjerke, Jarle W.; Phoenix, Gareth K.; Jaakola, Laura; Mæhre, Hanne; Tømmervik, Hans (Peer reviewed; Journal article, 2023)Arctic ecosystems are increasingly exposed to extreme climatic events throughout the year, which can affect species performance. Cryptogams (bryophytes and lichens) provide important ecosystem services in polar ecosystems ... -
Understanding the drivers of extensive plant damage in boreal and Arctic ecosystems: Insights from field surveys in the aftermath of damage
Bjerke, Jarle W.; Treharne, Rachael; Vikhamar-Schuler, Dagrun; Karlsen, Stein Rune; Ravolainen, Virve; Bokhorst, Stef; Phoenix, Gareth K.; Bochenek, Zbigniew; Tømmervik, Hans (Peer reviewed; Journal article, 2017)The exact cause of population dieback in nature is often challenging to identify retrospectively. Plant research in northern regions has in recent decades been largely focussed on the opposite trend, namely increasing ...