摘要
秃尾河发源于神木县的宫泊海子,流经神木、榆林,于佳县的武家峁注入黄河,全长140km,流域面积3294km^2该流域地处毛乌素沙漠南缘,北部为风沙区,南部为黄土丘陵沟壑区第一副区。秃尾河每年向黄河输入大量泥沙,其中粗沙占70％之多,为较严重的多沙粗沙河流。为了使现有土地资源得到充分利用,需进行有针对性的综合治理,即对土壤、地貌、侵蚀现状、植被、气象、社会经济环境等多种因子进行综合分析,划分出各种不同治理措施的类型区。由于定性分析对多因子综合分区有一定的局限性与主观随意性,本文初步尝试用贝叶斯准则逐步判别法进行水土保持综合治理区的一级区划。
The authors selected 20 continuous variables which influenced the zoning for harness- ment and laid out 81 quadrats in the Tuweihe river basin. Using the Bayes decision rule and examination of Wilks statistics,the authors finally selected 7 variables which had obvious influence on zoning for the harnessment to form a new statistic parameter by linear combination. Accord ing to Bayes rule, the first level zoning was made and 81 quadrats were delimit into two first level zone: wind erosion zone and gullied rolling loess zone. Based on the first level zone, the second level zone was made by using Q mOdel system assembled classified analysis,the wind erosion zone could be divided in to four subzones: flowing windborne sand subzone,semifixed windborne sand subzone, fixed windborne sand subzone and windborne sandy beach subzone, while the gullied rolling loess zone could be divided into three subzones: ridge covered by sand in west Tuweihe river, mound covered by sand in east Tuweihe river and rolling loess area.
出处
《中国水土保持》
北大核心
1990年第6期41-45,共5页
Soil and Water Conservation in China
