By Siegmar-W. Breckle, Aaron Yair, Maik Veste
Sand dune dynamics performs a key function in lots of arid deserts. This quantity offers a synthesis of a particular sand dune surroundings, the Nizzana web site within the Negev desolate tract. Describing its weather and geophysical/geochemical houses of soils, geological heritage, natural world, and past/present land-use styles, it elucidates ecological and geomorphological techniques and their interrelations, according to long term tracking, in situ experiments and satellite tv for pc imagery. specific cognizance is interested in the impression of the topsoil organic crust in controlling water availability at local/regional scales. The interdisciplinary procedure followed therefore research deals an excellent instance of a hugely complicated and dynamic procedure, that can simply be utilized to different sandy ecosystems. it is a necessary resource of data for soil ecologists and microbiologists, conservation biologists, wilderness ecologists and geographers, geomorphologists, soil scientists and climatologists, teachers, coverage makers and others drawn to deserts and desertification.
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Additional info for Arid Dune Ecosystems: The Nizzana Sands in the Negev Desert (Ecological Studies)
2, this volume). 3 Discussion of Results At least two main factors may explain the non-uniform timing of incision of the sand barriers by the drainage network. The first is the dimensions of the drainage basins. It is obvious that the incision of a sand barrier requires an extreme flow event, or a sequence of extreme events. Under such conditions, the larger the basin, the better are the chances to generate extreme flow discharges capable of incising a sand barrier. The second important factor relates to the surface properties of the drainage basin that control the frequency and magnitude of runoff generation.
Because of the high rate of infiltration 3 Formation and Geomorphology of the North-Western Negev Sand Dunes 33 in dune sand, most of the rain in humid climates is lost to the groundwater and is not available to the plants. Hence, the amount of rainfall is not a decisive factor in sand dune stabilization, whether in humid or in arid climates, except for temporary increases in the cohesiveness of wet sand. The deep infiltration of rainwater into dune sand reduces the effect of evaporation from the ground (Chap.
The first section provides an overview of the regional physical characteristics of the area and covers geological, pedological, geomorphological and climatological aspects, as well as desertification processes by land use. The second section focuses on the spatial patterns of the vegetation and topsoil crust covers. The third section covers the numerous studies dealing with ecosystem processes such as sand movement, evaporation and transpiration, runoff generation and water resources, recovery of the vegetation and of the biological crust following disturbance, photosynthesis, dewfall, activity of biological crusts, nitrogen input, demography of annual plants, etc.