Sven Jonasson

TL;DR: The relationship between microbial biomass and the abundance of microbivore and the role of grazing on nutrient turnover after annual addition of carbon, fertilizer, fungicide and bactericides to two dwarf shrub communities, a low and a high altitude heath is studied.

TL;DR: The impacts of environmental change on Arctic terrestrial ecosystems are complex and difficult to predict because of the many interactions which exist within ecosystems and between several concurrently changing environmental variables as discussed by the authors, however, some general predictions can be made.

TL;DR: It is concluded that N uptake by ECM plants is modulated by the N uptake patterns of both fungal and plant components of the symbiosis and by competitive interactions in the soil.

TL;DR: The results indicate that there is no common response to environmental changes across species and substances, but the pronounced treatment responses imply that the quality of the herbivore forage is likely to be strongly affected in a changing arctic environment, although both the direction and strength of the responses will be different among plant species, tissue types and substances.

TL;DR: In this article, the relative contributions of plant and bulk soil organic matter C pools to ecosystem CO2 production in mid-winter were investigated, and the results suggest that warmer midwinter temperatures in the Arctic may have a much greater impact on the cycling of recently fixed, plant-associated C pools than on the depletion of tundra bulk soil C reserves, and consequently that there is a low potential for significant initial feedbacks from arctic ecosystems to climate change during midwinter.