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首页> 外文期刊>Journal of geographical sciences >Influence of groundwater level change on vegetation coverage and their spatial variation in arid regions
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Influence of groundwater level change on vegetation coverage and their spatial variation in arid regions

机译：干旱区地下水位变化对植被覆盖及其空间变化的影响

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摘要

Sampling and testing are conducted on groundwater depth and vegetation coverage in the 670 km~2 of the Sangong River Basin and semi-variance function analysis is made afterwards on the data obtained by the application of geo-statistics. Results showed that the variance curve of the groundwater depth and vegetation coverage displays an exponential model. Analysis of sampling data in 2003 indicates that the groundwater depth and vegetation coverage change similarly in space in this area. The Sangong River Basin is composed of upper oasis, middle ecotone and lower sand dune. In oasis and ecotone, influenced by irrigation of the adjoining oasis, groundwater level has been raised and soil water content also increased compared with sand dune nearby, vegetation developed well. But in the lower reaches of the Sangong River Basin, because of descending of groundwater level, soil water content decreased and vegetation degenerated. From oasis to abandoned land and desert grassland, vegetation coverage and groundwater level changed greatly with significant difference respectively in spatial variation. Distinct but similar spatial variability exists among the groundwater depth and vegetation coverage in the study area, namely, the vegetation coverage decreasing (increasing) as the groundwater depth increases (decreases). This illustrates the great dependence of vegetation coverage on groundwater depth in arid regions and further implies that among the great number of factors affecting vegetation coverage in arid regions, groundwater depth turns out to be the most determinant one.
机译：对三公河流域670 km〜2的地下水深度和植被覆盖度进行抽样和测试，然后对利用地统计学方法获得的数据进行半方差分析。结果表明，地下水深度和植被覆盖率的方差曲线显示出指数模型。对2003年采样数据的分析表明，该区域的地下水深度和植被覆盖度在空间上的变化相似。三宫河流域由上绿洲，中过渡带和下沙丘组成。在绿洲和过渡带，由于毗邻绿洲的灌溉，与附近的沙丘相比，地下水位上升，土壤含水量也增加，植被发育良好。但是在三工河下游，由于地下水位的下降，土壤含水量减少，植被退化。从绿洲到荒地和荒漠草原，植被覆盖度和地下水位变化很大，空间变化差异很大。研究区域的地下水深度和植被覆盖率之间存在明显不同但相似的空间变异性，即，随着地下水深度增加（减小），植被覆盖率降低（增加）。这说明了干旱地区植被覆盖度对地下水深度的高度依赖性，并进一步暗示在影响干旱地区植被覆盖度的众多因素中，地下水深度是决定性因素。

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