小流域土壤侵蚀危险评价研究

Soil Erosion Risk Assessment in Small Catchment

以陕西米脂县泉家沟流域为例,从土壤抗蚀性、地貌形态、植被覆盖和土地利用、降雨等方面分析了影响土壤侵蚀危险性的因素。在微机地理信息系统支持下,选取地貌类型、坡度、高度、土地利用等作为评价因子,进行了数据采集和图件分析。运用叠加分类和条件叠加模型,将研究区域分为强度、中度、轻度和无侵蚀危险类型,输出了土壤侵蚀危险评价图,并指出了各种类型的特征和防治侵蚀的措施。

This paper discuss soil erosion risk assessment in small catchment and take Quanjiagou basin in Mizhi county of Shaanxi province as a ease study.The factors influencing soil erosion risk i.e.,soil antierosionness,landforms,vegetation coverage,current landuse situation and rainfall are analysed.Based on the micro-computer geographical information system and through data-select- ing,map-analysing,Overlay-classifying,conditional overlaying model,four classes:strong,medi- um,low and no-erosion risk are devided in the area taking the landforms,slope,elevation,and cur- rent landuse as the assessing criteria.A soil erosion risk assessment map is outputed by computer system.The characteristics and erosion-preventing measures of each class are pointed out finally.