荒漠植被影响下的沙地稳定入渗率变化特征  

The Variation Features of Steady Infiltration Rates in Sand Influence by Desert Vegetation

作　　者：汤英[1,2] 周宏飞[3,2] 徐利岗[1,2] 

机构地区：[1]石河子大学,新疆石河子832000 [2]中国科学院阜康荒漠生态系统观测试验站,新疆阜康831505 [3]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011

出　　处：《土壤通报》2009年第2期235-239,共5页Chinese Journal of Soil Science

基　　金：国家自然科学基金项目(40671037);中国科学院知识创新工程重要方向性项目(KZCX2-YW-431);国家十一五科技支撑计划项(2007BAC17B02)资助

摘　　要：在古尔班通古特沙漠南缘中国科学院阜康荒漠生态站北沙窝试验区,分别选取沙垄顶、沙垄间不同下垫面条件(裸地和梭梭)的沙漠土壤进行双环入渗试验,研究沙垄和垄间梭梭树下,距树干不同距离(50,100,150,200cm)和不同方向(东、西、南、北)稳定入渗速率变化规律。实验结果表明:梭梭树周围不同距离的沙垄和垄间稳定入渗率与孔隙度变化规律趋于一致;梭梭树下稳定入渗率在距树干较近时最大,随着距离的增加而呈放射状迅速下降,这一关系可用指数函数表示,沙垄间:K=3.9266e-0.2466(LR2=0.959),沙垄上:K=8.4713e-0.0739L(R2=0.933);沙垄顶上的稳定入渗率值为垄间相应位置处的3～6倍,梭梭周围二者具有相似的变化规律。Based on different situations in the southern part of Gurbantunggut desert, the steady infiltration rates were determined by using the double-ring infiltrometer in the Fukang Observatory of Ecological System of Desert, Chinese Academy of Sciences. The results showed that the changing trendancy of soil moisture was similar between the top of ridge and inter ridge under the different surface conditions, soil texture and different distances around the stem. In the inter rige, the smaller the distance around the stem was, the bigger infiltration rate was. And the infiltration rates declined steeply with increasing distance from the stem, the radial trendancey was described by a power-function model （On the top of ride,K = 3.9266e^-0.2466L.R2= 0.959; In the inter ridge, K = 8.4713e^-0.0739L, R2 = 0.933）. The steady infiltration rates on the top of ridge were 3-6 times than that in the inter ridge.

关 键 词：稳定入渗率 古尔班通古特沙漠 荒漠植被 沙地 孔隙度 

分 类 号：S152.72[农业科学—土壤学]