冀北山区不同土地利用类型的坡面产流产沙与降雨的关系研究  

Study on the relationship between rainfall characters and runoff-sediment yield of slopes of different land use types in northern mountain area of Hebei

作　　者：江青龙[1] 谢永生[1,2] 赵婷[2] 张应龙[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]中国科学院水利部水土保持研究所,陕西杨凌712100

出　　处：《干旱地区农业研究》2011年第6期202-207,共6页Agricultural Research in the Arid Areas

基　　金：水利部公益性行业科研专项经费项目"冀北山区生态输水小流域治理模式与关键技术"(200901051)

摘　　要：针对京津地区重要水源地的冀北山区区位的特殊性,以及生态环境脆弱、水土流失严重等问题,于河北围场县曹家沟布设土地利用分别为乔木林地、疏林地、天然草地的三个径流小区,通过对降雨特征及其对产流产沙的影响进行分析,得到如下结论:引起产流的次降雨以中雨和大雨为主,平均次降雨强度为5.83 mm/h;乔木林、疏林地、天然草地的次径流量与降雨量和降雨历时乘积呈显著相关;产沙模数与降雨量和降雨强度乘积的相关系数依次为0.587、0.501和0.613;天然草地和疏林地的产沙模数与径流深度都呈现极显著正相关性,而乔木林的相关性不显著;三种坡面的拦沙蓄水能力大小依次为乔木林>天然草地>疏林地。A study was made in the highly fragile ecological environment with serious soil and water loss in northern mountain area of Hebei Province, which was the water source area of the cities of Beijing and Tianjin. Three runoff plots with land use types of forest, open forest and natural grassland were constructed in Caojiagou of Weichang County, and the rainfall characters and runoff and sediment yield of the three plots were analyzed. The results showed that the rainfalls which caused runoff on the plots were mainly moderate rain and heavy rain, and the average rainfall intensity was 5.83 ram/h; correlative analysis showed that there was a positive correlation between runoff and the product of rainfall and rainfall duration; the correlation coefficients between sediment yield modules and the product of rainfall and rainfall intensity of forest, open forest and natural grass land were 0.587, 0.501 and 0.613 respectively; the sediment yield modules of open forest and natural grass land showed a highly significant correlation with the runoff depth, while the forest＇ was not. The capacity of soil and water conservation of the three slopes was in the order of forest 〉 natural grass land 〉 open forest.

关 键 词：土地利用类型 降雨特征 产流产沙 冀北山区 

分 类 号：S157.1[农业科学—土壤学]