岷江上游地区水土流失危险度评价

Risk Assessment of Soil and Water Loss in Upper Reaches of Min River

在分析影响岷江上游水土流失的自然因素和人为因素的基础上,从水土流失现状和驱动力两个方面选择了10个评价指标,建立了岷江上游地区水土流失危险度综合评价模型并进行了评价。结果表明:在5个县中,松潘县水土流失处于轻度危险状态,茂县、汶川县处于中度危险状态,黑水县和理县因水土流失危险度指数综合值都比较大而处于重度危险状态。根据其发展趋势分析,松潘县、茂县和汶川县的水土流失程度可能会进一步加重,理县的水土流失程度会有所减轻,黑水县的水土流失危险度综合指数和现状强度指数相近,因而其今后的水土流失程度变化可能较小。

The paper selects ten evaluation indexes from two aspects of the present status and the driving forces of soil and water loss,building an integrated risk evaluation model of soil and water loss in the upper reaches of Min River and conducting evaluation based on the natural and artificial factors of soil and water loss in the region.The outcomes show that among the five counties,the soil and water loss of Songpan County is in the light state of danger,Maoxian County and Wenchuan County in the middle state of danger,Heishui County and Lixian County in the severe state of danger because of having greater index values of risk degree of soil and water loss.According to the analysis of development trend,the degree of soil and water loss of counties of Songpan,Maoxian and Wenchuan might be worse,the degree of Lixian Country would be lightened and the indexes of risk degree and the current intensity of Heishui County are similar and its variations of soil and water loss in the future would be smaller.