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    Author(s): Randall D. Jackson; Barbara Allen-Diaz
    Date: 2002
    Source: In: Standiford, Richard B., et al, tech. editor. Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in California's Challenging Landscape. Gen. Tech. Rep. PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 119-129
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (900 KB)

    Description

    Spring-fed wetlands are small, highly productive, patchy ecosystems nested within the oak woodland/annual grassland matrix of the Sierra Nevada foothills. In an effort to place these wetlands in a landscape context, we described seasonal variation (1999-2000 growing season) in nitrogen cycling parameters at 6 spring-fed wetland sites of the Sierra Nevada foothill oak woodlands. Ammonium and nitrate pool sizes covaried inversely with nitrate dominance (about 3 μg N g dry soil-1) in autumn/winter during plant dormancy and ammonium dominance (about 6 μg N gds-1) in spring/summer when wetland plants were beginning yearly production cycles. Nitrate is highly mobile in the vadose zone, but can accumulate in the absence of plant growth during dry summer months in the annual grasslands surrounding these wetland systems. With the onset of autumn rains, much of this nitrate may be flushed down slope to spring systems. Spring-fed wetlands may act as either as sources, sinks, or as transformers of this exogenously derived nitrogen.

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    Citation

    Jackson, Randall D.; Allen-Diaz, Barbara. 2002. Nitrogen dynamics of spring-fed wetland ecosystems of the Sierra Nevada foothills oak woodland. In: Standiford, Richard B., et al, tech. editor. Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in California''s Challenging Landscape. Gen. Tech. Rep. PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 119-129

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