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| Voice of the Environment's mission is to educate the public regarding the transfer of public trust assets into private, mostly corporate, hands. | ||
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Ukiah office: 1330 Boonville Rd Ukiah, CA 95482 707-467-0329 |
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Napa office: 391 Crystal Springs Rd St. Helena, CA 94574 707-963-8264 |
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| For two decades, Voice of the Environment has stood up for the people and our communities against the avarice of corporations and the misguided policies of the corporate-dominated state. |
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Print This Article Tuesday, June 21st, 2005 Heavy Fertilizer Use May Transform Lakes for Centuries, Study Suggests Sarah Graham/Scientific American The widespread use of phosphorous-rich fertilizers by industrial agriculture could permanently alter the chemistry of nearby lakes, a new study suggests. Even if environmental inputs of the element are curbed considerably, the results indicate that the effects could be felt for decades to come. Stephen R. Carpenter of the University of Wisconsin-Madison modeled the levels of phosphorus in and around Lake Mendota, a body of fresh water located in Madison, Wisc. with a watershed that is still about 80 percent farmland. "The global pattern is the same," Carpenter remarks, suggesting that the results may be applicable to many other similar lakes around the world. "We are releasing far more phosphorus to the soil than would be released by weathering [alone]." When too many nutrients are present in lake water algae growth can be stimulated to the point of choking off the oxygen supplies for other lake inhabitants, including fish. This process, known as eutrophication, can continue for years. Indeed, Carpenter's simple model, described in a report published online this week by the Proceedings of the National Academy of Sciences, suggests that a eutrophic state could persist for hundreds of years. Intensive fertlization began around the middle of last century making widespread eutrophication a relatively new environmental problem, Carpenter writes. In addition, he notes that "There's a huge amount of phosphorus in the watershed that hasn't washed into the lake yet" and steps--such as changes in soil management and reducing rates of erosion--should be taken now to improve water quality. Print This Article |
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Voice of the Environment is a 501 (c-3) not-for-profit Montana-based corporation formed in 1991.
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