19 Result(s)
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Monique M. P. D. Heijmans
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Article
Open AccessExtremely wet summer events enhance permafrost thaw for multiple years in Siberian tundra
Permafrost thaw can accelerate climate warming by releasing carbon from previously frozen soil in the form of greenhouse gases. Rainfall extremes have been proposed to increase permafrost thaw, but the magnitu...
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Tundra vegetation change and impacts on permafrost
Tundra vegetation productivity and composition are responding rapidly to climatic changes in the Arctic. These changes can, in turn, mitigate or amplify permafrost thaw. In this Review, we synthesize remotely ...
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Article
Plant functional trait change across a warming tundra biome
The tundra is warming more rapidly than any other biome on Earth, and the potential ramifications are far-reaching because of global feedback effects between vegetation and climate. A better understanding of h...
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Publisher Correction to: Background invertebrate herbivory on dwarf birch (Betula glandulosa-nana complex) increases with temperature and precipitation across the tundra biome
The above mentioned article was originally scheduled for publication in the special issue on Ecology of Tundra Arthropods with guest editors Toke T. Høye . Lauren E. Culler. Erroneously, the article was publis...
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Open AccessThaw pond development and initial vegetation succession in experimental plots at a Siberian lowland tundra site
Permafrost degradation has the potential to change the Arctic tundra landscape. We observed rapid local thawing of ice-rich permafrost resulting in thaw pond formation, which was triggered by removal of the sh...
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Background invertebrate herbivory on dwarf birch (Betula glandulosa-nana complex) increases with temperature and precipitation across the tundra biome
Chronic, low intensity herbivory by invertebrates, termed background herbivory, has been understudied in tundra, yet its impacts are likely to increase in a warmer Arctic. The magnitude of these changes is how...
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Open AccessSeasonal changes and vertical distribution of root standing biomass of graminoids and shrubs at a Siberian tundra site
Shrub expansion is common in the tundra biome and has been linked to climate warming. However, the underlying mechanisms are still not fully understood. This study aimed to investigate the seasonal and vertica...
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Open AccessThe role of summer precipitation and summer temperature in establishment and growth of dwarf shrub Betula nana in northeast Siberian tundra
It is widely believed that deciduous tundra-shrub dominance is increasing in the pan-Arctic region, mainly due to rising temperature. We sampled dwarf birch (Betula nana L.) at a northeastern Siberian tundra site...
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Permafrost collapse after shrub removal shifts tundra ecosystem to a methane source
The release of carbon from decomposing Arctic soils, following permafrost thaw, is a potentially important climate feedback. Research now shows how shrub cover protects permafrost carbon reservoirs. Manipulati...
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Open AccessField Simulation of Global Change: Transplanting Northern Bog Mesocosms Southward
A large proportion of northern peatlands consists of Sphagnum-dominated ombrotrophic bogs. In these bogs, peat mosses (Sphagnum) and vascular plants occur in an apparent stable equilibrium, thereby sustaining the...
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Open AccessResponse of Sphagnum species mixtures to increased temperature and nitrogen availability
To predict the role of ombrotrophic bogs as carbon sinks in the future, it is crucial to understand how Sphagnum vegetation in bogs will respond to global change. We performed a greenhouse experiment to study the...
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Open AccessDwarf shrubs are stronger competitors than graminoid species at high nutrient supply in peat bogs
Climate warming is likely to increase nutrient mineralization rates in bog ecosystems which may change the plant species composition. We examined the competitive relationships between two graminoid species, Eriop...
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Photosynthetic performance in Sphagnum transplanted along a latitudinal nitrogen deposition gradient
Increased N deposition in Europe has affected mire ecosystems. However, knowledge on the physiological responses is poor. We measured photosynthetic responses to increasing N deposition in two peatmoss species (S...
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Open AccessSwift recovery of Sphagnum nutrient concentrations after excess supply
Although numerous studies have addressed the effects of increased N deposition on nutrient-poor environments such as raised bogs, few studies have dealt with to what extent, and on what time-scale, reductions ...
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Open AccessThe effect of temperature on growth and competition between Sphagnum species
Peat bogs play a large role in the global sequestration of C, and are often dominated by different Sphagnum species. Therefore, it is crucial to understand how Sphagnum vegetation in peat bogs will respond to glo...
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The Nitrogen Cycle in Boreal Peatlands
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Article
Response of a Sphagnum bog plant community to elevated CO2 and N supply
The response of plant growth to rising CO2 levels appears todepend on nutrient availability, but it is not known whether the growth of bogplants reacts similarly. We therefore studied the effects of elevatedCO2 i...
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Effects of Increased Nitrogen Deposition on the Distribution of 15N-labeled Nitrogen between Sphagnum and Vascular Plants
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Chapter
Can Testate Amoebae (Protozoa) and Other Micro-Organisms Help to Overcome Biogeographic Bias in Large Scale Global Change Research?
To monitor global change, large scale long term studies are needed. Such studies often focus on vegetation, but most plant species have limited distribution areas. Micro-organisms by contrast are mostly cosmop...
