Excess nitrogen from fertilizer, septic tanks, animal feedlots, and runoff from pavement can threaten aquatic ecosystem health. Riparian buffers-- the vegetated region adjacent to streams and wetlands-- are thought to be effective at intercepting and controlling excess nitrogen. Resource managers often ask how wide a riparian buffer zone should be to effectively control nitrogen loads entering water bodies. Science Objective: Scientists at the U.S. Environmental Protection Agency’s Office of Researc
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