排序方式: 共有6条查询结果,搜索用时 125 毫秒
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通过几年来对陕西榆林沙漠地日光温室栽培技术的研究,笔总结了八项增效要点,应用推广后使温室的经济效益大幅度提高。 相似文献
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毛乌素沙地沙漠化过程及其整治对策 总被引:14,自引:0,他引:14
吴薇 《中国生态农业学报》2001,9(3):15-18
毛乌素地区是我国北方沙漠化严重发生地区之一,阐述了该地区沙漠化的发展进程,认为沙漠化主要是因人为不合理的土地利用所造成,沙漠化过程虽人为作用对生态系统的干扰和植被破坏后,以风为主导外营力所产生的土地退化。并提出了沙漠化整治的原则与具体措施。 相似文献
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Thomas Littmann Maik Veste 《中国林学(英文版)》2005,7(4):24-28
A stochastic numerical approach was developed to model the actual standing biomass in the sand dunes of the northwestern Negev (Israel) and probable boundary conditions that may be responsible for the vegetation patterns investigated in detail. Our results for several variables characteristic for the prevailing climate, geomorphology, hydrology and biologicy at four measurement stations along a transect from northwest to southeast allowed for the development of a stochastic model for biomass distribution over the entire sand dune field (mesoscale) and at Nizzana experimental station (microscale). With this equation it was possible to compute and interpolate a biomass index value for each grid point on the mesoscale and micro scale. The spatial distribution of biomass is negatively linked to distance from the sea, to rainfall and relief energy. 相似文献
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西部沙漠化防治技术与模式 总被引:4,自引:0,他引:4
总结了我国西部地区沙漠化防治的5大系列,14项适用技术,指出技术推广应解决的问题,并阐述了西部不同气候区沙漠化防治成功模式及其生态、经济效益,介绍了国外利用龟裂地集水、太阳能脱盐建立性畜饮水点工程典型技术模式。 相似文献
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