Soils and vegetation of Santa Barbara Island,Channel Islands National Park,California, USA |
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Authors: | William L Halvorson Dennis B Fenn William R Allardice |
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Institution: | (1) Channel Islands National Park, 1904 Spinnaker Drive, 93001 Ventura, California, USA;(2) Cooperative Park Studies Unit Department of Recreation and Parks, Texas A&M University, 77843-2261 College Station, Texas, USA;(3) Department of Soils, Water and Engineering, University of California, Davis, 95616 Davis, California, USA |
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Abstract: | The multifaceted development of an erosion surface on Santa Barbara Island, Channel Islands National Park, California, has led to this study of the relationship between soils and vegetation. A dry Mediterranean climate and past attempts at farming and introductions of alien species have led to vegetative degradation accompanied by both gully and surface erosion. Soil and vegetation analyses show this erosion to be in a location of transition. The soils are Typic Chromoxererts (Vertisol Order) with high clay, salinity, and sodium contents. The vegetation is ecotonal in nature, grading from a principally alien annual grassland withAvena fatua andAtriplex semibaccata to a shrub community dominated by the nativeSuaeda californica. Management toward revegetation and stabilization of this island ecosystem will be difficult with high clay, saline-sodic soils and disturbed vegetation. |
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Keywords: | Soil erosion Gully erosion Vegetation Santa Barbara Island Devastation area |
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