用模糊—动态聚类法对青海省东部进行水土保持综合治理亚区划分

Application of Fuzzy-Dynamic Clustering in Division ofComprehensive Control for Soil and Water Conservation inEast Part of Qinghai Province

青海省东部农业区是本省水土流失最严重的地区，属黄土高原丘陵沟壑区第四副区。本文在对该区１６县（市）共２３４个乡的自然、社经、土地利用、水土流失和气象等因子全面调查的基础上，采用模糊－动态聚类方法，对本区进行水土保持分类，克服了单用模糊聚类或系统聚类易出现聚类分散，分类结果难于预见和单用动态聚类人为授权过多的弊病。特别是分区指标的样本数量较多时，这种现象就表现的更加突出。应用该方法进行分类，得出了３个亚区，各区的自然条件，水土流失特点和治理方向与实际情况完全相符，分类结果科学合理。

The agricultural area in the eaest part of Qinghai province is the severest soil and water loss area in Qinghai province, belongs the fourth sub-division of hilly-gullied region on loess plateau. On the basis of whole investiging factors of nature,social-economics .land use.soil and water loss and climate in 234 community of 16 counties (cities),using dynamic cluster with fuzzy-cluster analysis,classification of soil and water conservation has been made,it is overcome that using single fuzzy-cluster analysis or systemic cluster analysis easily result in cluster dispersion and it is hard to see classification results and using dynamic cluster analysis causes shortcomings of human's over-influnces, especially as division index and sample size are bigger all this situation appers stricking. Using this method to classify, three type districts have been gotten,natural condition, character of soil and water loss and control direction in every district are fully accorded to practice situation, classifying results are scientific and rational.