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Conservation Science for a Healthy Planet

Removing nitrate with buffer zones for healthier ecosystems

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September 27, 2017 American Society of Agronomy read full ScienceDaily article here

In a new study, researchers have identified nitrate removal hotspots in landscapes around agricultural streams.

Nitrogen can present a dilemma for farmers and land managers. On one hand, it is an essential nutrient for crops. However, excess nitrogen in fertilizers can enter groundwater and pollute aquatic systems. This nitrogen, usually in the form of nitrate, can cause algal blooms. Microbes that decompose these algae can ultimately remove oxygen from water bodies, causing dead zones and fish kills.

In a new study, researchers have identified nitrate removal hotspots in landscapes around agricultural streams. “Understanding where nitrate removal is highest can inform management of agricultural streams,” says Molly Welsh, lead author of the study. “This information can help us improve water quality more effectively.”…

….Nitrate removal in buffer zones was significantly higher than in stream sediments. “If nitrate removal is the goal of stream restoration, it is vital that we conserve existing buffer zones and reconnect streams to buffer zones,” says Welsh….

Molly K. Welsh, Sara K. McMillan, Philippe G. Vidon. Denitrification along the Stream-Riparian Continuum in Restored and Unrestored Agricultural Streams. Journal of Environment Quality, 2017; 46 (5): 1010 DOI: 10.2134/jeq2017.01.0006

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