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- W934374503 abstract "Vegetational variability within a desert grassland region of southeastern Arizona was studied on five Paleozoic rock formations and two alluvial deposits. The lithologies of the formation and deposits included: quartzite; mixed lithology primarily of siltstone, sandstone, limestone and limey shale; and three limestones. The purpose of the study was to examine the correspondence between perennial vegetation patterns and assemblages growing on the different lithologies and the geologic and edaphic characteristics of the lithologies. Density of individual plant species, percent vegetative cover, and percent rock and rock fragment cover were recorded from three 20x5 meter quadrats located on each geologic unit and one 20x5 meter quadrat located on each alluvial deposit. Soil samples were obtained from each quadrat for laboratory analysis for pH, organic carbon, inorganic carbon, and sand, silt and clay fraction. The soil depth to bedrock or petrocalcic soil horizon was recorded from excavated soil pits across each formation. The soil and rock units for each formation were described. Compositional affinities of vegetation from each site were analyzed using TWINSPAN (Two-way Indicator Species Analysis) and CurtisBray polar ordination. Results indicate differences in both plant assemblages and in relative abundance of plant species on each of the rock formations. Several species of plants were growing on only one geologic unit. Lithologic factors such as the physical nature of the rock, lithologic composition, color, and type 1andform and physical and chemical edaphic factors such as surface rockiness, soil type, and soil depth determine the vegetational distribution." @default.
- W934374503 created "2016-06-24" @default.
- W934374503 creator A5079497952 @default.
- W934374503 date "1993-01-01" @default.
- W934374503 modified "2023-09-23" @default.
- W934374503 title "Geologic and edaphic factors influencing plant distributions at Siphon Canyon, Cochise County, Arizona" @default.
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