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Directing research to reduce the impacts of nonindigenous species

The Nitrogen Cycle at Regional to Global Scales: Report of the International SCOPE Nitrogen Project

This issue is the final report from the International SCOPE Project on Nitrogen Transport and Transformations: A Regional and Global Analysis. SCOPE (the Scientific Committee on Problems of the Environment, ICSU) authorized the Nitrogen Project as an 8-year effort between 1994 and 2002 because of the need to better understand how humans have altered nitrogen cyc1ing globally and at the scale of large regions. Human activity has more than doubled the rate of formation of reactive nitrogen on the land surface of the earth, and the nitrogen cyc1e continues to accelerate.

Nutrient pollution of coastal rivers, bays, and seas

Nitrogen use in the United States from 1961-2000 and potential future trends

The nitrogen cycle

Towards an ecological understanding of biological nitrogen fixation

Where did all the nitrogen go? Fate of nitrogen inputs to large watersheds in the northeastern USA

Nitrogen retention in rivers: Model development and application to watersheds in the northeastern USA

Anthropogenic nitrogen sources and relationships to riverine nitrogen export in the northeastern USA

Human activities have greatly altered the nitrogen (N) cycle, accelerating the rate of N fixation in landscapes and delivery of N to water bodies. To examine relationships between anthropogenic N inputs and riverine N export, we constructed budgets describing N inputs and losses for 16 catchments, which encompass a range of climatic variability and are major drainages to the coast of the North Atlantic Ocean along a latitudinal profile from Maine to Virginia.

Dinitrogen fixation in the world's oceans