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We conducted 15NO 3− stable isotope tracer releases in nine streams with varied intensities and types of human impacts in the upstream watershed to measure nitrate (NO 3− ) cycling dynamics. Mean ambient NO 3− concentrations of the streams ranged from 0.9 to 21,000 μg l−1 NO 3− –N. Major N-transforming processes, including uptake, nitrification, and denitrification, all increased approximately...
Long-term data on nitrogen chemistry of streams draining Konza Prairie Biological Station (Konza), Kansas were analyzed to assess spatial and temporal patterns and examine the influence of agricultural activity on these patterns. Upland watersheds of Konza are predominantly tallgrass prairies, but agricultural fields and riparian forests border the lower reaches of the streams. We have up to 11 years...
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