草业科学2018，Vol.35Issue(3)：463-471,9.DOI:10.11829/j.issn.1001-0629.2017-0349
狗牙根和三叶草的根系特征及对荒坡紫色土抗剪性能的影响
Root characteristics of Cynodon dactylis and Trifolium repens and their effect on shear performance of purple soilin barren hillside
摘要
Abstract
To investigate the soil reinforcement of grass roots on purple soil on barren hillsides and the factors affecting it,purple soil under the environment was assessed via an experiment with three treatments:A blank control and soil under Cynodon dactylon and Trifolium repens.After eight months,basic physical and chemical properties,root parameters,and soil shear strength were measured by conventional methods,the root analysis system (WinRHIZO(Pro.2004c)) and strain controlled direct shear apparatus.The root parameters of C.dactylon were better than those of T.repens;root diameter of C.dactylon was significantly higher than that of T.repens (d≤0.2 mm;P＜0.05).C.dactylon was more effective than T.repens in improving soil physical and chemical properties.Both kinds of grass effectively improved the shear performance of the root-soil system.Compared with the blank control,the internal friction angle (φ) and cohesion (c) of soil under C.dactylon and T.repens were higher by 10.37％,66.36％,and 1.14％,34.22％,respectively,and the shear performance of soil under C.dactylon was better than that of soil under T.repens.Soil bulk density,total porosity,capillary porosity,and root length density (RLD) were the key indexes affecting the shear performance of the root-soil system,and d ≤ 0.2 mm was the critical diameter class affecting shear performance.关键词
荒坡/草类根系/根长密度/根径/微团聚体/抗剪强度Key words
barren hillside/root system of grass/root length density/root diameter/micro aggregate/shear strength分类
农业科技引用本文复制引用
周涛,刘枭宏,谌芸,王润泽,李铁,翟婷婷,吴晨,宗永青..狗牙根和三叶草的根系特征及对荒坡紫色土抗剪性能的影响[J].草业科学,2018,35(3):463-471,9.基金项目
国家自然科学基金(41501288) （41501288）
重庆市基础科学与前沿技术研究一般项目(cstc2017jcyjAX0472) （cstc2017jcyjAX0472）
中央高校基本科研业务费专项(XDJK2015C170、XDJK2017D206) （XDJK2015C170、XDJK2017D206）
西南大学第九届本科生科技创新基金项目(20162402008) （20162402008）
西南大学资源环境学院“光炯”项目(201719) （201719）
