A Screening Procedure for Identifying Acid-Sensitive Lakes from Catchment Characteristics |
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| Authors: | N H Berg A Gallegos T Dell J Frazier T Procter J Sickman S Grant T Blett M Arbaugh |
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| Institution: | (1) Pacific Southwest Research Station, Albany, California, U.S.A.;(2) Sierra National Forest, Clovis, California, U.S.A.;(3) 353 Homestead Avenue, Metairie, Louisiana, U.S.A.;(4) Stanislaus National Forest, Sonora, California, U.S.A.;(5) Sequoia National Forest, Porterville, California, U.S.A.;(6) Department of Soil and Water Science, University of Florida, Gainesville, Florida, U.S.A.;(7) Air Resources Division, National Park Service, Denver, Colorado, U.S.A.;(8) Pacific Southwest Research Station, USDA Forest Service, Riverside, California, U.S.A. |
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| Abstract: | Monitoring of Wilderness lakes for potential acidification requires information on lake sensitivity to acidification. Catchment properties can be used to estimate the acid neutralizing capacity (ANC) of lakes. Conceptual and general linear models were developed to predict the ANC of lakes in high-elevation ( 2170 m) Wilderness Areas in California s Sierra Nevada mountains. Catchment-to-lake area ratio, lake perimeter-to-area ratio, bedrock lithology, vegetation cover, and lake headwater location are significant variables explaining ANC. The general linear models were validated against independently collected water chemistry data and were used as part of a first stage screen to identify Wilderness lakes with low ANC. Expanded monitoring of atmospheric deposition is essential for improving the predictability of lake ANC. |
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| Keywords: | atmospheric deposition California lake ANC model Sierra Nevada water quality watershed |
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