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基于改进层次分析法的干旱扬水灌区水土环境变迁响应评估

, PP. 880-886

Keywords: 水土环境变迁,层次分析法,响应评估

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Abstract:

受大量的外调水资源和人工灌溉的影响,干旱扬水灌区的水土环境变迁过程具有独特性,其对区域环境要素的响应是长期、潜在而缓慢的,该过程可通过科学的评估与分析描述其发展的趋势。评价过程是否合理,评价结果是否准确是灌区可持续发展的关键。通过应用改进的层次分析法,对干旱扬水灌区水土环境变迁响应进行了评价。结果表明:干旱扬水灌区水土环境变迁响应因子都属于"微敏感"因子;地表水对水土环境的变迁响应相对较为强烈,其次为地下水、区域气候,而土地利用最为迟缓;18个响应因子中最为敏感的是灌区提水量及灌溉用水量,次之为地下水水位及回归水水质。该评价模型的评价结果与当前灌区水土环境变化现状相吻合,验证了改进层次分析法在干旱扬水灌区水土环境变迁响应评价中的有效性和可操作性,可为灌区的建设和管理提供科学合理的参考依据。

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