摘要
一、柳河地区土壤侵蚀模式 柳河地区位于北纬42°10′～43°00′,东经120°30′～122°30′,地处辽西与内蒙交界,面积7000多km^2,是全国水土保持重点区之一。从全国侵蚀分区看,柳河地区属风蚀、水蚀过渡区、春季风蚀严重,夏季水蚀严重;北部风蚀严重,南部水蚀严重,时空各异。 为了推算全区的土壤侵蚀量,我们首先建立风蚀、水蚀过渡区的侵蚀类型模式及不同类型条件下的侵蚀强度模式。设总侵蚀量为E,则 E=E水+E风 (1) 柳河地区是风蚀、水蚀的过渡类型区,过渡类型是典型的模糊数学问题,因此我们采用模糊集合即建立隶属度的方法来求土壤侵蚀类型模式。 在柳河地区的每一个地理位置上,设水蚀与风蚀的模糊集分别为U水、U风,与其相应的隶属函数为P水、P风。则有 P水+P风=1 (2) 由上式可见,只要确定P风即可求出P水。这里因缺少风蚀的定位观测资料,只得用经验推理法来求P风。分析影响风蚀隶属度的主导因素,得到隶属函数:
Liuhe region,located at latitude 42° 10' - 43°00'N and longitude 120°30' 122° 30' E on the juncture of west Liaoning Province and the Inner Mongolia Autonomous Region with an area of more than 7000km^2,is one of the key area for soil and water conservation in China.The region belongs to the transition zone between wind erosion and water erosion. Wind erosion is severe in north part during spring while water erosion is severe in south part during summer.In this paper,the equation of total soil erosion in the transition zone is given out.Method of acquiring various erosion parameters as well as the process of making soil erosion map are also presented.
出处
《中国水土保持》
北大核心
1990年第1期39-40,共2页
Soil and Water Conservation in China
