榆林地区土地生态风险评价研究

Study on Land Ecological Risk Assessment in Yulin District

根据生态风险评价的理论与方法,以榆林地区12个区县为单元,选择干旱、洪涝、水土流失和土地沙化4个自然因素和煤炭开采、石油开采、天然气开采3个人为因素作为风险源,利用历史记录、调查数据和地理信息技术,在单因子生态风险程度分析的基础上,利用加权和法进行综合风险程度分析,将全地区土地分为4个生态风险区域,极强风险区包括神木县和府谷县,强风险区包括靖边县和定边县,中度风险区包括榆阳区、横山县、子洲县、吴堡县和佳县,弱风险区包括米脂县、绥德县和清涧县。

On the basis of the theory and method of ecological risk assessment, made use of the 12 countries as object, selects drought, flood, soil erosion, desertification as natural factor, and coal mining,oil exploitation and gas exploitation as human factor, used the historic record, survey date and geographical information system to evaluate the single-factor ER. By means of weight average method to evaluate the whole district＇ s ER,and classify the district to four area：the most risk area included Shenmu County and Fugu County,the more risk area included Jingbian County and Dingbian County, the normal risk area included, Yuyang County, Hengshan County, Zizhou County, Wubu County and Jia County,the lighter risk area included Mizhi County, Suide County and Qingjian County.