Nitrogen (N) is used in many of life's fundamental biomolecules, and it is also a participant in
environmental redox chemistry. Biogeochemical processes control the amount and form of N …

Nutrient fluxes to coastal areas have risen in recent decades, leading to widespread hypoxia
and other ecological damage, particularly from nitrogen (N). Several factors make N more …

Whether and how to synchronously regulate stream water nitrogen (N) and phosphorus (P)
concentrations and ratios is a major challenge for sustainable aquatic functions. Soil carbon …

Human alteration of Earth is substantial and growing. Between one-third and one-half of the
land surface has been transformed by human action; the carbon dioxide concentration in the …

Agriculture and urban activities are major sources of phosphorus and nitrogen to aquatic
ecosystems. Atmospheric deposition further contributes as a source of N. These nonpoint …

Nitrogen is a key element controlling the species composition, diversity, dynamics, and
functioning of many terrestrial, freshwater, and marine ecosystems. Many of the original …

This paper contrasts the natural and anthropogenic controls on the conversion of unreactive
N 2 to more reactive forms of nitrogen (Nr). A variety of data sets are used to construct global …

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Human production of food and energy is the dominant continental process that breaks the
triple bond in molecular nitrogen (N2) and creates reactive nitrogen (Nr) species. Circulation …

A primary focus of coastal science during the past 3 decades has been the question: How
does anthropogenic nutrient enrichment cause change in the structure or function of …