Ellen Dorrepaal
A5008326742- Climate change and permafrost
- Peatlands and Wetlands Ecology
- Cryospheric studies and observations
- Botany and Plant Ecology Studies
- Geology and Paleoclimatology Research
- Bryophyte Studies and Records
- Polar Research and Ecology
- Soil Carbon and Nitrogen Dynamics
- Microbial Community Ecology and Physiology
- Plant Water Relations and Carbon Dynamics
- Coastal wetland ecosystem dynamics
- Lichen and fungal ecology
- Forest ecology and management
- Methane Hydrates and Related Phenomena
- Ecology and Vegetation Dynamics Studies
- Fire effects on ecosystems
- Tree-ring climate responses
- Environmental Impact and Sustainability
- Indigenous Studies and Ecology
- Arctic and Antarctic ice dynamics
- Turfgrass Adaptation and Management
- Rangeland and Wildlife Management
- Seedling growth and survival studies
- Species Distribution and Climate Change
- Marine and environmental studies
Abisko Scientific Research Station
2016-2025
Umeå University
2016-2025
Impact
2012-2024
Swedish University of Agricultural Sciences
2020
Vrije Universiteit Amsterdam
2003-2017
Utrecht University
1998
Abstract Many of the world's northern peatlands are underlain by rapidly thawing permafrost. Because plant production in these is often nitrogen ( N )‐limited, a release stored permafrost may stimulate net primary or change species composition if it plant‐available. In this study, we aimed to quantify plant‐available soils subarctic peatlands. We compared ‐pools and ‐fluxes near‐surface (0–10 cm below thawfront) those taken from current rooting zone layer (5–15 depth) across five...
As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to decomposition, combustion, and hydrologic export. Models predict that some portion of this release offset by increased production Arctic boreal biomass; however, lack robust estimates net balance increases risk further overshooting international emissions targets. Precise empirical or model-based assessments critical factors driving are unlikely in near future, so address gap, we present from 98...
Research in global change ecology relies heavily on climatic grids derived from estimates of air temperature open areas at around 2 m above the ground. These do not reflect conditions below vegetation canopies and near ground surface, where critical ecosystem functions occur most terrestrial species reside. Here, we provide maps soil bioclimatic variables a 1-km2 resolution for 0-5 5-15 cm depth. were created by calculating difference (i.e. offset) between situ measurements, based time...
Abstract Current analyses and predictions of spatially explicit patterns processes in ecology most often rely on climate data interpolated from standardized weather stations. This represents long‐term average thermal conditions at coarse spatial resolutions only. Hence, many climate‐forcing factors that operate fine spatiotemporal are overlooked. is particularly important relation to effects observation height (e.g. vegetation, snow soil characteristics) habitats varying their exposure...
Snow is an important driver of ecosystem processes in cold biomes. accumulation determines ground temperature, light conditions, and moisture availability during winter. It also affects the growing season’s start end, plant access to nutrients. Here, we review current knowledge snow cover’s role for vegetation, plant-animal interactions, permafrost microbial processes, biogeochemical cycling. We compare studies natural gradients with experimental manipulation assess time scale difference...
Abstract Arctic and alpine tundra ecosystems are large reservoirs of organic carbon 1,2 . Climate warming may stimulate ecosystem respiration release into the atmosphere 3,4 The magnitude persistency this stimulation environmental mechanisms that drive its variation remain uncertain 5–7 This hampers accuracy global land carbon–climate feedback projections 7,8 Here we synthesize 136 datasets from 56 open-top chamber in situ experiments located at 28 arctic sites which have been running for...
1 Plant growth forms are widely used to predict the effects of environmental changes, such as climate warming and increased nitrogen deposition, on plant communities, consequences species shifts for carbon nutrient cycling. We investigated whether relationship between patterns in litter quality decomposition independent conditions good chemistry at predicting decomposability. 2 a natural, latitudinal gradient NW Europe spatial analogue future increases temperature availability. Our screening...
Abstract Sphagnum mosses form a major component of northern peatlands, which are expected to experience substantially higher increases in temperature and winter precipitation than the global average. may play an important role responses carbon cycle climate change. We investigated summer length growth, carpet structure production fuscum experimentally induced changes sub‐arctic bog. Thereto, we used open‐top chambers (OTCs) create six scenarios including temperatures, snow cover spring...
Abstract Climate warming increases nitrogen (N) mineralization in superficial soil layers (the dominant rooting zone) of subarctic peatlands. Thawing and subsequent permafrost plant‐available N around the thaw‐front. Because plant production these peatlands is N‐limited, such changes may substantially affect net primary species composition. We aimed to identify potential impact increased N‐availability due thawing on peatland performance, relative organic layers. Therefore, we investigated...
Abstract Environmental manipulation studies are integral to determining biological consequences of climate warming. Open Top Chambers ( OTC s) have been widely used assess summer warming effects on terrestrial biota, with their during other seasons normally being given less attention even though chambers often deployed year‐round. In addition, temperature extremes and freeze‐thaw events poorly documented. To provide robust documentation the microclimatic influences s throughout year, we...
Summary Climate‐warming‐induced permafrost thaw exposes large amounts of carbon and nitrogen in soil at considerable depths, below the seasonally thawing active layer. The extent to which plant roots can reach interact with these hitherto detached, deep stores remains unknown. We aimed quantify how affects root dynamics across depths functional types compared above‐ground abundance, potential consequences for plant–soil interactions. A decade experimental strongly increased total length...
Abstract The decomposition of large stocks soil organic carbon in thawing permafrost might depend on more than climate change-induced temperature increases: indirect effects via altered bacterial community structure (BCS) or rooting patterns are largely unexplored. We used a 10-year situ thaw experiment and aerobic incubations to investigate alterations BCS potential respiration at different depths, the extent which they related with each other root density. Active layer strongly differed,...
Soil carbon in permafrost ecosystems has the potential to become a major positive feedback climate change if thaw increases heterotrophic decomposition. However, warming can also stimulate autotrophic production leading increased ecosystem storage-a negative feedback. Few studies partitioning respiration examine decadal effects or compare responses among ecosystems. Here, we first examined how 11 years of during different seasons affected and bryophyte-dominated peatland Abisko, Sweden. We...
Abstract Alpine and Arctic treeline expansion depends on establishment of tree seedlings beyond the current treeline, which is expected to occur with climate warming. However, treelines often fail respond higher temperatures, it therefore likely that other environmental factors are important for seedling establishment. We aimed analyse our understanding how temperature a range drivers affect at alpine world‐wide assess relative importance compared they interact. collected 366 observations...
Climate change can alter peatland plant community composition by promoting the growth of vascular plants. How such vegetation affects carbon dynamics remains, however, unclear. In order to assess effect on uptake and release, we performed a plant-removal experiment in two Sphagnum-dominated peatlands that represent contrasting stages natural succession along climatic gradient. Periodic measurements net ecosystem CO2 exchange revealed plants play crucial role assuring potential for uptake,...
Climate change has become one of the main issues in environmental and sustainability discussions during last decade. Acting to reduce climate can be viewed as a prosocial behavior, previous research found that personal norms are important explaining these types behaviors, together with other attitudinal factors. In this study we use Moral Foundations Theory (MFT) explore antecedents three factors: problem awareness, social adherence New Ecological Paradigm. Analyzing data from nationwide...