林木根系对坡面土崩解特性的影响  

Effects of tree roots on disintegration characteristics of slope soil

作　　者：邓仁贵 宋文杰 彭杰帅 DENG Rengui;SONG Wenjie;PENG Jieshuai(Hunan Water Conservancy and Hydropower Research Institute,Changsha 410114,China;Hunan Southern Water Conservancy and Hydropower Survey and Design Institute Co.,Ltd.,Changsha 410114,China)

机构地区：[1]湖南省水利水电科学研究院,湖南长沙410007 [2]湖南南方水利水电勘测设计院有限公司,湖南长沙410007

出　　处：《人民长江》2018年第19期100-104,共5页Yangtze River

基　　金：湖南省水利科技项目"植生型多孔混凝土在中小河流治理中的应用"(湘水科计[2017]230-44)

摘　　要：林木根系能大大增强坡面土抗崩解能力。首先制作不同直径、含根量、分布形式、含水量的根系重塑土样,然后对不同条件下根-土复合体进行崩解试验,分析了林木坡面土体崩解特性的影响因素。实验数据表明:根系直径相同时,复合土含水量从15%增加到25%,水平根系的复合土抗崩解能力减小较快,垂直根系及复合根系抗崩解能力减小较慢;含水量一定时,3种根系分布形式的复合土抗崩解能力随根系直径和数量的增大而增大;根系直径和复合体含水量一定时,复合根系的根土复合体抗崩解能力最强,垂直根系次之,水平根系最弱。由此可以得出:林木根系影响土崩解的主要因素是根系分布形式,其次为土的含水量及根系直径,这对选择适宜林木植物护坡具有一定的借鉴作用。Tree root system can greatly improve the anti-disintegration characteristics of slope soil.The root remolding soil samples with different diameters,root contents and distribution forms,water content were prepared.The root-soil composite disintegration tests were conducted under different conditions to analyze the influence factors to the soil disintegration characteristics of the forest slope surface.The results showed that when the water content of the composite soil increased from 15%to 25%,the anti-disintegration ability of the horizontal root reduced faster while the vertical and compound roots forms reduced slower.When the water content remains constant,the anti-disintegration abilities of three composite soils increase with the increasing of root diameter and quantity.When the root diameter and water content remain constant,the anti-disintegration ability of the composite root system has the greatest disintegration resistance,followed by the vertical root system and the horizontal root system.Through statistical analysis,it can be found that the root system of trees can influence soil disintegration,and the main influential factors are root distribution form,followed by soil water content and root diameter.The conclusion provides a certain reference for choosing suitable plant slope protection of forest trees.

关 键 词：土体崩解 乔木根系 根-土复合体 护坡固土 

分 类 号：S157[农业科学—土壤学]