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Plant-soil Interactions in Deserts
Authors:William H Schlesinger  Adrienne M Pilmanis
Institution:(1) Department of Botany, Duke University, Durham, N.C, 27708, USA;;(2) Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, Durham, N.C 27708, USA
Abstract:Geostatistical analyses show that the distribution of soil N, P and K is strongly associated with the presence of shrubs in desert habitats. Shrubs concentrate the biogeochemical cycle of these elements in lsquoislands of fertilityrsquo that are localized beneath their canopies, while adjacent barren, intershrub spaces are comparatively devoid of biotic activity. Both physical and biological processes are involved in the formation of shrub islands. Losses of semiarid grassland in favor of invading shrubs initiate these changes in the distribution of soil nutrients, which may promote the further invasion and persistence of shrubs and cause potential feedbacks between desertification and the Earth's climate system.
Keywords:aridisols  desertification  erosion  geostatistics  Larrea tridentata  nitrogen  phosphorus  Prosopis glandulosa  soil heterogeneity
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