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- W4238729710 abstract "In 1960, areas of chaparral were converted to perennial grass after a fire burned most of the San Dimas Experimental Forest in southern California. This conversion provided an opportunity to compare regolith moisture patterns of zero‐order watersheds under native chaparral with those under nonnative veldt grass ( Ehrharta calycina Sm.). We collected data as a function of vegetation type and watershed element to test the hypothesis that conversion from chaparral to grass altered water distribution in the vadose zone as a result of changes in the physical environment, including rooting depth and soil horizonation. Patterns in vadose zone water distribution during the dry season, including soil water potential and residual flux, were significantly different in converted areas, reflecting the different rooting habits of the two vegetation types. In chaparral areas, there was no significant change in soil water potential between the surface and the 150‐cm depth; soil water potential was consistently below −1.5 MPa, reflecting the extensive root system. In grass areas, soil water potential was most negative close to the surface, where grass roots were most abundant. Plant available water was present below the 100‐cm depth, suggesting that recharge to groundwater may occur under grass in average or wetter years. Under both vegetation types, the largest differences in residual water fluxes were near the soil–weathered rock contact. However, there was a significant relation between minor differences in fluxes and soil horizon boundaries, confirming the effects of vegetation conversion on soil properties and vadose zone soil water." @default.
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- W4238729710 date "2004-08-01" @default.
- W4238729710 modified "2023-10-17" @default.
- W4238729710 title "Regolith Water in Zero‐Order Chaparral and Perennial Grass Watersheds Four Decades after Vegetation Conversion" @default.
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- W4238729710 doi "https://doi.org/10.2136/vzj2004.1007" @default.
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