Sven Jonasson

TL;DR: Inorganic N and amino acid concentrations were lowest in the period with highest plant activity and grass root biomass but were unaffected by TA addition, while inorganic and microbial N concentration during the growing season was investigated in an ecosystem with a natural tannin chemosphere.

TL;DR: Nematode data were related to respiration and active fungal biomass in the soil, indicating that rather than allelochemicals with nematicidal properties, carbohydrates in the leaf extracts promoting a beneficial microflora may have affected the nematode community.

TL;DR: In this paper, an assessment of the impacts of changes in climate and UV-B radiation on Arctic terrestrial ecosystems, made within the Arctic Climate Impacts Assessment (ACIA), highlighted the profound implications of projected warming in particular for future ecosystem services, biodiversity and feedbacks to climate.

TL;DR: In this paper, the authors focus on biota (plants, animals and microorganisms) and processes in the re-gion beyond the northern limit of the closed forest (the taiga), but also include processes south of this boundary that affect ecosystems in the Arctic.

TL;DR: In a recent Gikos article Karlsson (1994) reports results of a combined shading and leaf removal experiment, in which he investigated the relative significance of nutrient (N and P) and carbon supply from old leaves for the subsequent growth of the wintergreen, alpine dwarf shrub Rhododendron lapponicum, and found that nutrient transport from old to new leaves was important for thesequent growth, whereas carbon depletion by shading and defoliation affected subsequent growth little.