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Science 4 May 1979:
Vol. 204. no. 4392, pp. 469 - 474
DOI: 10.1126/science.204.4392.469
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Articles
Nitrate Losses from Disturbed Ecosystems
Peter M. Vitousek 1,
James R. Gosz 2,
Charles C. Grier 3,
Jerry M. Melillo 4,
William A. Reiners 5, and
Robert L. Todd 6
1 Assistant professor, Department of Biology, Indiana University, Bloomington 47405
2 Associate professor, Department of Biology, University of New Mexico, Albuquerque 87131
3 Associate professor, College of Forest Resources, University of Washington, Seattle 98195
4 Assistant scientist, The Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543
5 Professor, Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755
6 Assistant professor, Department of Agronomy, University of Georgia, Athens 30601
A systematic examination of nitrogen cycling in disturbed forest ecosystems demonstrates that eight processes, operating at three stages in the nitrogen cycle, could delay or prevent solution losses of nitrate from disturbed forests. An experimental and comparative study of nitrate losses from trenched plots in 19 forest sites throughout the United States suggests that four of these processes (nitrogen uptake by regrowing vegetation, nitrogen immobilization, lags in nitrification, and a lack of water for nitrate transport) are the most important in practice. The net effect of all of these processes except uptake by regrowing vegetation is insufficient to prevent or delay losses from relatively fertile sites, and hence such sites have the potential for very high nitrate losses following disturbance.
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