石羊河流域土壤肥力综合评价

Comprehensive Evaluation of Soil Fertility in Shiyang River Basin

文章旨在揭示石羊河流域土壤肥力质量空间变化规律，为流域综合治理提供指导。以石羊河流域各灌区土壤为研究对象，采用模糊数学方法进行了分析计算，建立了石羊河流域土壤肥力评价指标体系。结果表明，石羊河流域各灌区土壤肥力质量具有明显的空间异质性，自西向东土壤肥力逐渐降低，中游凉州区土壤肥力较好，土壤肥力综合评价指标值在0．53—0．63之间，下游民勤县土壤肥力较弱，土壤肥力综合评价指标值在0．41～0．49之间。图2，表5，参16。

The objective of this study was to explore the spatial variability of soil fertility indices and soil fertility quality in providing guideline for basin management. Based on the soil from irrigation area in Shi Yang River Basin the index system of soil fertility was es- tablished and, the fertility level was evaluated by Fuzzy Analysis. It was found that there was a greater spatial variability between west and east for the soil fertility in Shi Yang River Basin, which was gradually reduced from the west to the east. The soil fertility in the mid- dle reaches of Liangzhou District was higher, The evaluation results indicated the comprehensive index of soil fertility was from 0. 53 to 0. 63. The soil fertility of Minqin County in the downstream was poor with comprehensive index of soil fertility from 0. 41 to 0.49.