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• W294034530 abstract "Soil heterogeneity can influence ecosystem structure and dynamics. Its origin has been attributed largely to disturbance (physical and biological) or to varying soil genesis factors. In theoretical ecology, spatial heterogeneity is often credited with the maintenance of species diversity, structure, and stability in ecosystems. This study sought to discern the existence, origin, and role of soil variability within chaparral ecosystems of southern California. In 20 randomly chosen chaparral stands, surface (10 cm) soil samples were taken under various canopy shrubs, and species coverage was measured along a 30 m transect. The chaparral stands included those dominated by Adenostoma fasciculatum (chamise), by A, sparsifolium (red shanks), or by a mixture of the two congeners. The order of stands on the first axis of a detrended correspondence analysis (DCA) axis was used in regression analysis to evaluate the trends in soil parameters between the three types of stands. From chamise, through mixed, to red shanks chaparral, soils increased in percent moisture, percent organic matter, ammonium and sulfate concentration, and acidity. In mixed stands, where soil samples were taken under chamise and red shanks shrubs on the same transect, soil properties differed often as in the larger area trends. In addition to the above characteristics excepting ammonium, soil under red shanks had higher calcium concentration, and lower percent coarse fraction (<2 mm) and magnesium concentration. A DCA of soil samples indicated that soils of the two shrubs were quite different on a fine scale within a community. The existence of this fine scale heterogeneity in the chaparral requires a reexamination of vegetation dynamics in these fire-adapted systems. Most of the soil properties that differed between chamise and red shanks were ones likely influenced by the shrubs themselves. Future research needs to evaluate further the plant-soil relationships in these chaparral ecosystems, and what role they might play in determining community structure and patterning in the vegetation." @default.
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• W294034530 creator A5081797337 @default.
• W294034530 date "1987-01-01" @default.
• W294034530 modified "2023-09-26" @default.
• W294034530 title "ORIGIN AND ROLE OF SOIL VARIABILITY IN SOUTHERN CALIFORNIA CHAPARRAL" @default.
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• W294034530 doi "https://doi.org/10.1080/02723646.1987.10642306" @default.
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