Brian Fry

TL;DR: The use of stable isotopes to solve biogeochemical problems in ecosystem analysis is increasing rapidly because stable isotope data can contribute both source-sink (tracer) and process information: the elements C, N, S, H, and all have more than one isotope, and isotopic compositions of natural materials can be measured with great precision with a mass spectrometer as mentioned in this paper.

TL;DR: In this article, the formation and decay of soil organic matter in surface soils of two oak (Quercus spp.) forests in Wisconsin were studied using δ 15 N and δ 13 C measurements and two controls of soil isotopic compositions: new litter inputs and overall isotopic fractionation during decomposition.

TL;DR: Evidence is provided from a 15N-tracer field experiment showing that plant species in a nitrogen-limited, arctic tundra community were differentiated in timing, depth and chemical form of nitrogen uptake and that species dominance was strongly correlated with uptake of the most available soil nitrogen forms.

TL;DR: In this paper, a combination of stable isotopic measurements was used to study food web structure of Georges Bank, an important northwestern Atlantic fishing ground, in order to test δ13C, δ15N and δ34S measurements as trophic-level indicators in offshore systems.

TL;DR: In this paper, a 77-month study of the decay of red pine (Pinus resinosa Ait.) needle litter was carried out using standard chemical techniques and stable isotope analyses of C and N.