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Science 6 December 1996:
Vol. 274. no. 5293, pp. 1585 - 0
DOI: 10.1126/science.274.5293.1585g
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This Week in Science

Addition of limiting nutrients to the environment, such as from fertilizers or detergents, can threaten ecosystems; one example is the phosphorus-driven eutrophication of lakes. The last decade has seen a substantial increase in rates of nitrogen deposition from the atmosphere, and a long-term experiment in Minnesota by Wedin and Tilman (p. 1720) suggests a negative impact for grasslands. Loss of biodiversity was associated with the displacement of native slow-growing grasses (a shift from C4 to C3 species), a reduction in the net storage of carbon per additional unit of nitrogen, and a sharp threshold decrease in retention of nitrogen in the soil.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)