虎榛子群丛根系的固土作用研究  

Effect of Soil Reinforcement by Ostryopsis Davidiana Decaisne Root System

作　　者：周建勤[1,2] 贾宏涛[2] 朱金兆[1] 谢建强[1] 

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]新疆农业大学草业与环境学院,新疆乌鲁木齐830052

出　　处：《水土保持通报》2010年第5期229-231,共3页Bulletin of Soil and Water Conservation

基　　金：国家科技支撑项目"典型脆弱区域气候变化适应技术示范"(2007BAC03A06);国家自然科学基金(40901155);新疆土壤学重点学科项目;北京市教育委员会学科建设与研究生教育建设项目(CXYBL2008-2010)

摘　　要：共选样地18块,其中15块均为由虎榛子(Ostryopsis davidiana Decaisne)单一种组成的植被群落样地,另外选择对照样地3块,样地规格为5m×5m。18块样地均测定了地表以下20,40,60,80,100cm共5个层面的土壤抗剪强度,同时测定对照裸地样地的紧实度和虎榛子植被群落样地根截面积率。虎榛子植被群落样地土壤样品需去除裸地抗剪强度的影响。在研究林木根系固土作用时,必须消除土壤紧实度造成的影响。经测量计算,土壤样品根截面积率最大为1.014%,对应的抗剪强度增强值(也为最大值)为0.1346kN/m2。分析结果表明,虎榛子群丛根系对土壤抗剪强度的增强值与穿过剪切面的根截面积率呈线性正相关。18 sampling areas of size 5 m×5 m were selected,of which 15 sampling areas were composed of Ostryopsis davidiana Decaisne vegetation community only.Soil shear strengths at the depths of 20,40,60,80,and 100 cm in the 18 plots were measured.3 bare lands of size 5 m×5 m were selected and soil compaction and the ratio of sectional root area were measured as well.The effect of soil shear strength in bare land was then removed from the soil sample in Ostryopsis davidiana Decaisne vegetation community.By calculation,the ratio of sectional root area was 1.014% and the corresponding shear strength was the maximum value of 0.134 6 kN/m2.Analyses indicated that the increased value of soil shear strength in the Ostryopsis davidiana Decaisne vegetation community rood system was positively correlated to the ratio of sectional root area.

关 键 词：抗剪强度 固土作用 土壤紧实度 根截面积率 

分 类 号：S157.5[农业科学—土壤学] Q947.6[农业科学—农业基础科学]