Lynn M. Christenson

TL;DR: A meta-analysis of studies at 48 sites across four continents that used enriched 15N isotope tracers concluded that growth enhancement and potential for increased C storage in aboveground biomass from atmospheric N deposition is likely to be modest in these ecosystems.

TL;DR: In this article, the authors used long-term watershed and natural elevation gradient studies at the Hubbard Brook Experimental Forest and in the surrounding region to demonstrate the effects of climate change on hydrologic variables (e.g., evapo- transpiration, streamflow, soil moisture); the importance of changes in phenology on water, carbon, and nitrogen fluxes during critical seasonal transition periods; winter climate change effects on plant and animal community composition and ecosystem services; and the effects on anthro- pogenic disturbances and land-use history on plant community composition.

TL;DR: Soils from lower elevation plots, which accumulated less snow and experienced more soil temperature variability during the winter, had less extractable inorganic nitrogen (N), lower rates of microbial N production via potential net N mineralization and nitrification, and higher potential microbial respiration during the growing season.

TL;DR: In this paper, the authors show multiple data streams from long-term ecological research at the Hubbard Brook Experimental Forest in New Hampshire, USA suggesting that N oligotrophication in forest soils is driven by increased carbon flow from the atmosphere through soils that stimulates microbial immobilization of N and decreases available N for plants.

TL;DR: In this article, the authors examined the relationship between changes in climate, especially during winter, and Nitrogen supply to northern hardwood forest ecosystems and found that low elevation plots with less snow, more soil freezing, and more freeze/thaw cycles supported lower rates of N mineralization than high elevation plots, despite having higher soil temperatures and no consistent differences in soil moisture during the growing season.