Nitrogen in rock: Occurrences and biogeochemical implications

Biogeochemical Processes and Implications for Nutrient Cycling

The availability and cycling of nutrients is determined by an interaction of physical, chemical, and biological processes in an ecosystem. This interaction of processes, collectively known as biogeochemistry, is important as it determines the forms, transformations, and ultimate fate of nutrients in a given system. This chapter focuses on biogeochemical processes in springs and spring runs with...

A Watershed-Scale Biogeochemical Loading Model for Nitrogen and Phosphorus

The New York State Water Resources Institutes (NYSWRI) FY2001 activity under the Federal Water Resources Research Act consisted largely of eleven research projects funded during FY1999, FY2000, and FY2001. The FY 2001 Annual Report reports on a FY2000 project and a FY 2001 project from national 104G competitions, one project from a supplemental funding source, one from the FY 1999 New York Stat...

Biogeochemical signatures of nitrogen fixation in the eastern North Atlantic

[1] Stable nitrogen isotopic determination of particulate organic matter over the eastern North Atlantic in spring 2000 reveal a region of low natural abundance of N relative to N between 26 N and 32 N along 20 W. This light isotopic signal, together with phytopigment data and persistently elevated nitrate to phosphate ratios in the upper thermocline, suggest that nitrogen fixation provides a l...

Factors Controlling Biogeochemical Removal of Nitrogen in Constructed Wetlands

The Long Island Sound (LIS) estuary is affected by summer hypoxia as a result of high nitrogen loads from New York and Connecticut watersheds. In order to mitigate hypoxia, managers have established a goal of reducing the nitrogen load from nonpoint sources by 10%. One strategy to reduce N loads from nonpoint sources is the use of constructed wetlands, which provide an ecosystem service by remo...

[The role of atmospheric ammonia in biogeochemical nitrogen circulation].