【摘要】 对旱作农业区和河西灌溉农业区分别选用不同的指标,用模糊聚类方法,将本省划分成7个水分区,13个亚区,并对各区进行了评述,指出了土地利用的方向。牧区以定性方法设置测站,农区采用分层对称等距法布设测站。以随机抽样方法求得农区测站总数,以降蒸差变异系数和耕地而积系数求算各水分分区权重,并依此确定各区测站数,在此基础上按面积等距法确定测站位置。从抽样误差,代表耕地面积等方面论证了测站布局方案的可行性。更多还原

【Abstract】 The different indexes are adopted respectively for the dry farmi- ng regions and irrigation farming regions,using the method of Fuzzy cluster the Gansu Province is divided into 7 soil moisture divisions and 13 subdivisions- The description is made for each division and the way of land use is shown for each division. The stations were set up in pastoral area with the qualitative methods and in farming area on the principle of stratified symmetry and equidistance.The total number of stations is obtained from random sampling,the weights of ea- ch divisions are caculated with variation coefficient of difference between pre- cipitation and potential evapolranspiration and the coefficient of cultivated la- nd area.The number of stations in each division is defined with these weights The locations of stations are defined according to the method of area-equidis- tance. The feasibility of stations distribution plan is proved according to sampling error,area of representative cultivated land and so on.更多还原