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冰川冻土  2012 

黑河下游额济纳绿洲土地生产潜力的动态变化及影响因素分析

, PP. 1336-1345

Keywords: 黑河下游,土地生产潜力,影响因素

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Abstract:

在通过VisualMODFLOW软件模拟地下水位的基础上,采用GIS技术进行栅格运算,把影响土地生产潜力的各个因子作为"修正"系数,运用逆向因子修正法分析黑河下游土地生产潜力的变化.在计算不同影响因素组合条件下土地生产潜力的同时,结合不同的分水方案,对各影响因素进行分析.结果表明在狼心山来水量为7.5×108m3·a-1时,区域的水分有效系数整体增加,植被覆盖度增大,土地生产潜力大幅度提高,能有效改善当地的生态环境.与现状相比,在来水量为2.5×108m3·a-1时,东河下游的水分有效系数出现降低的情形;在来水量为5.0×108m3·a-1和7.5×108m3·a-1时,其水分有效系数均显著增加.通过对影响因素的剖析有利于预警当地荒漠化发展的趋势,进一步建立土地沙漠化的判别指标体系,从而为黑河流域的土地生产服务.

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