Background: Nitrogen fixation has been quantified for a range of crop legumes and
actinorhizal plants under different agricultural/agroforestry conditions, but much less is …

Organic farming is believed to improve soil fertility by enhancing soil organic matter (SOM)
contents. An important co-benefit would be the sequestration of carbon from atmospheric CO …

Stable isotope analysis is a powerful tool in the study of soil organic matter formation. It is
often observed that more decomposed soil organic matter is 13C, and especially 15N …

Organic fertilizers have the capacity to alter the nitrogen isotopic composition of plants.
Camelid dung and seabird guano are two potentially important fertilizers in the agricultural …

Purpose We compared the patterns of natural abundance of nitrogen (N) isotope ratio (δ 15
N) of total soil N among cropland, forest, and grassland soils, with special interests in the …

Shrub growth has increased across the Arctic in recent decades and is strongly limited by
soil nitrogen (N) availability. In order to understand the role of N in controlling shrub growth …

Organic carbon (C) and nitrogen (N) are essential for heterotrophic soil microorganisms, and
their bioavailability strongly influences ecosystem C and N cycling. We show here that the …

Background Stable isotope analysis is being utilized with increasing regularity to examine a
wide range of issues (diet, habitat use, migration) in ecology, geology, archaeology, and …

Understanding the effects of land-use change on stock and composition of soil organic
carbon (SOC) and nitrogen (N) is pivotal for sustainable agriculture and climate change …

Humans are increasing both the deposition of reactive nitrogen (N) and concentrations of
atmospheric CO2 on Earth, but the combined effects on terrestrial ecosystems are not clear …