Paul Grogan

TL;DR: This article used repeat photography, long-term ecological monitoring and dendrochronology to document shrub expansion in arctic, high-latitude and alpine tundra.

TL;DR: It is shown that arctic soil bacterial community composition and diversity are structured according to local variation in soil pH rather than geographical proximity to neighboring sites, suggesting that local environmental heterogeneity is far more important than dispersal limitation in determining community-level differences.

TL;DR: Biome-wide relationships between temperature, moisture and seven key plant functional traits across the tundra and over time show that community height increased with warming across all sites, whereas other traits lagged behind predicted rates of change.

TL;DR: The results indicate that moderate freeze – thaw fluctuations may have minimal influences on microbial biomass pools, but nevertheless can have strong contrasting effects on the amounts, forms, and timing of N and organic C supply into the soil solution.

TL;DR: The results suggest that plant uptake of nitrate is low in recently burned forest communities but could be an important component of eco- system N cycling in mature conifer stands, and redistribution of surface ash after fire by wind or water may cause substantial heterogeneity in soil N availability to plants.