中国北方农牧交错带河北省怀来县生态环境敏感性分析

该文运用卫星遥感数据，在Arc/info和Arcview支持下，对怀来盆地的土壤潜在侵蚀强度和坡度进行了计算，并将结果运用于环境敏感性分类中.环境敏感性分类所选取的6项指标为行政村数目、土壤潜在侵蚀强度、坡度、年降水量、森林覆盖度和草地覆盖度.根据怀来县各区域的环境敏感度Sr的计算结果,以环境敏感度值11为分类步长，将怀来县15个乡镇划分成了5个等级，分别代表5个区域:Ⅰ级属于不敏感区域，有东花园乡、瑞云观乡、小南辛堡乡、孙庄子乡和大黄庄乡5个乡镇；Ⅱ级属于轻微敏感区域，包括桑园乡、存瑞乡、王家楼乡和北辛堡乡4个乡镇；Ⅲ级属于中度敏感区域，包括沙城、鸡鸣驿和西八里3个乡镇；Ⅳ级属于高度敏感区域，包含官厅镇、新保安、东八里和狼山乡4个乡镇；Ⅴ级为极敏感区域，只有土木乡1个乡镇.怀来县生态环境敏感性区域的划分，可为怀来县进行生态规划、产业结构调整、实现资源与经济的可持续发展提供指导作用. 

Environmental sensitivity analysis of Huailai County, Hebei Province of the agriculture pasture ecotone of northern China.

Based on Arc/info and Arcview technological support,utilizing remote sensing data,the soil potential erosion intensity and slope of Huailai County,Hebei Province,were calculated,and the two indices were used in the environmental sensitivity analysis.For environmental sensitivity analysis,six indices were selected: the number of villages,soil potential erosion intensity,slope,annual precipitation,forest coverage and grass coverage.According to the numerical value of environmental sensitivity S-r in each township of Huailai County,environmental sensitivity of fifteen towns belonging to Huailai County was divided into five grades and the classification length was eleven.These five grades stand for five different areas.Grade Ⅰ: areas that are not sensitive,including the townships of Donghuayuan,Ruiyunguan,Xiaonanxinpu,Sunzhuangzi and Dahuangzhuang.Grade Ⅱ: areas that are slightly sensitive,including the townships of Sangyuan,Cunrui,Wangjialou and Beixinpu.Grade Ⅲ: areas that are moderately highly sensitive,including the townships of Shacheng,Jimingyi and Xibali.Grade Ⅳ: areas that are highly sensitive,including the townships of Guanting,Xinbaoan,Dongbali and Langshan.Grade V: area that is very highly sensitive,including the only township of Tumu.Environmental sensitivity analysis of Huailai County can play an important guiding role for the ecological planning,industrial structure adjustment and sustainable development of resources and the economy of Huailai County.