Date:3/20/2013

s of stream ammonium data from 22 streams in 7 experimental forests across the country. They found that even these near-pristine forested streams are subject to change, as stream nitrate has declined in the Pacific Northwest, in the Northeast, and in Puerto Rico, but has increased in the Mountain West and the South. They also observed that, within a forest, trends were not always in syncat some sites, two streams within an experimental forest had opposing trends for the same type of nitrogen for the same period of time, suggesting that the controls on stream nitrogen concentrations may vary among and within sites.

"Understanding how nutrient concentrations are changing over time in reference streams is vital for informing best management practices that are aimed at protecting water resources," Argerich said.

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Contact: Yasmeen Sands ysands@fs.fed.us 360-753-7716 USDA Forest Service - Pacific Northwest Research Station Source:Eurekalert

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