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Science 10 June 1988:
Vol. 240. no. 4858, pp. 1515 - 1517
DOI: 10.1126/science.240.4858.1515
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Articles

Disruption of the Nitrogen Cycle in Acidified Lakes

J. W. M. Rudd 1, C. A. Kelly 2, D. W. Schindler 1, and M. A. Turner 1

1 Department of Fisheries and Oceans, Freshwater Institute, Winnipeg, Manitoba, Canada R3T 2N6
2 Department of Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

Experimental acidification of two small soft-water lakes caused nitrification to cease at pH values of 5.4 to 5.7. The resulting blockage of the nitrogen cycle caused a progressive accumulation of amnonium. When the epermental acidification of one of the lakes was ended and the pH was raised to 5.4, nitrification resumed after a time lag of 1 year.

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