六盘山叠叠沟小流域土壤稳渗速率及其影响因子  

Final Soil Infiltration Rate and Its Influencing Factors in the Small Catchment of Diediegou,Liupan Mountains

作　　者：杜阿朋[1] 何常清[2] 管伟[3] 王彦辉[1] 于澎涛[1] 徐丽红[1] 刘建立[4] 

机构地区：[1]中国林业科学研究院森林生态环境与保护研究所,北京100091 [2]南京林业大学森林资源与环境学院,南京210037 [3]中国林业科学研究院热带林业研究所,广州510520 [4]北京林业大学水土保持学院,北京100083

出　　处：《林业科学》2009年第10期25-31,共7页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(40730631;40671038;30671677);科技部"十一五"科技支撑计划项目课题(2006BAD03A1803);科技部社会公益研究专项(2004DIB3J102);中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2007038;CAFRIF200702);国家林业局森林生态环境重点实验室资助

摘　　要：采用小区漫流法研究叠叠沟小流域内4种典型植被下的土壤稳渗速率及其影响因子。结果表明:不同植被类型的土壤稳渗速率平均值表现为天然草地>虎榛子灌丛>沙棘灌丛>华北落叶松林地。坡向影响土壤稳渗速率表现为阴坡>半阴坡>阳坡,坡位对土壤稳渗速率的影响表现为中坡位>下坡位>上坡位,坡度对土壤稳渗速率的影响表现为中坡>陡坡>缓坡,当坡度小于25°时土壤稳渗速率随坡度增大而增大,当坡度大于25°时土壤稳渗速率随坡度增大而减小。因此,以坡度25°为分界点,找到了影响土壤稳渗速率的主导因子,并经多元逐步回归得到土壤稳渗速率与主要影响因素的分段函数。By using a method of overflowing in a slope plot, a final infiltration rate on hillslopes under 4 typical vegetation forms and the influencing factors were investigated in the small watershed of Diediegou. The result showed that the final infiltration rate of different vegetation types were： natural grassland 〉 shrub of Ostryyopsis davidiana 〉 shrub of Hippophae rhamnoides 〉 plantation of Larix principis-rupprechtii. The final soil infiltration rate on different slope aspects showed shady slope 〉 semi-shady slope 〉 semi-sunny slope. The final soil infiltration rate under different slope position exhibited midst slope position 〉 lower slope position 〉 upper slope position. The final soil infiltration rate under different slope gradient showed middle slope gradient 〉 steep slope 〉 gentle slope. The final infiltration rate increased with rising slope gradient as the slope gradient is smaller than 25°, and decreases with slope gradient as it is higher than 25°. Based on the data, the dominant influencing factors were discovered, and the relations between infiltration rate and influencing factors were obtained by step-wise regressing analyses for the cases below or above the slope gradient to 25°.

关 键 词：土壤入渗 稳渗速率 影响因素 六盘山 

分 类 号：S715.3[农业科学—林学]