|Erik Hobbie, John Moore, 2017 Carbon and nitrogen isotopes and concentrations in terrestrial plants from a six-year (2006-2012) fertilization experiment at the Arctic LTER, Toolik Field Station, Alaska.. 10.6073/pasta/011d1ba5f14fc9057dd67ff201174543||
The data set describes stable carbon and nitrogen isotopes and carbon and nitrogen concentrations from an August 2012 pluck of a fertilization experiment begun in 2006. Fertilization was with nitrogen (N) and phosphorus (P). Fertilization levels included control, F2, F5, and F10, with F2 corresponding to yearly additions of 2 g/m2 N and 1 g/m2 P, F5 corresponding to yearly additions of 5 g/m2 N and 2.5 g/m2 P, and F10 corresponding to yearly additions of 10 g/m2 N and 5 g/m2 P. After harvest, plants were separated by species and then by tissue.
|, Modeling and Isotopes Link Mycorrhizal Fungi to Soil Carbon and Organic Nitrogen Use..||
Birch, willow, and other shrubs in the Arctic are increasing in response to warming at the expense of grasses and sedges. This increased shrub cover may enhance winter snow capture, increase winter soil temperatures, deepen summer soil thawing, and increase the release of old carbon and nitrogen. The increased flux of sugars from shrubs to shrub-associated symbiotic fungi (termed mycorrhizal fungi) could stimulate decomposition of thawing organic matter and release organic nitrogen for plant uptake previously locked up for millennia.