| 金沙江干热河谷乡土草本植物根系提高土体抗剪强度及其模型预测 |
| |
| 引用本文： | 段青松,王金霞,杨旸,字淑慧,张川,张建生,孙高峰,余建新.金沙江干热河谷乡土草本植物根系提高土体抗剪强度及其模型预测[J].中国水土保持科学,2017(4):87-95. |
| |
| 作者姓名： | 段青松 王金霞 杨旸 字淑慧 张川 张建生 孙高峰 余建新 |
| |
| 作者单位： | 1. 云南农业大学水利学院国土资源科学技术工程研究中心,650201,昆明;2. 河海大学水利水电学院,210098,南京;3. 云南农业大学农学与生物技术学院,650201,昆明 |
| |
| 基金项目： | 国土资源部国家公益性行业科研专项课题“立体特征突显区域土地整治技术与建设模式研究”(201511003-3) |
| |
| 摘 要： | 开展金沙江干热河谷乡土草本植物根系提高土体抗剪强度及预测的研究,为该地区生态恢复、边坡防护、水土流失防治等生态工程中植物选择及其固土能力的计算提供依据.采用原位剪切试验测定扭黄茅(Heteropogon contortus)、莎草(Eulaliopsis binata)、芸香草(Cymbopogon distans)、旱茅(Schizachyrium delavayi(Hack.)Bor)等4种乡土草本植物根系及素土的抗剪切强度;用根系拉力计和电子卡尺测定根系的抗拉强度和直径:用Wu和Waldron垂直根模型(WWM)及纤维束根增强模型(FBM)对根系提高土体抗剪能力进行预测.结果表明:1)4种植物根系直径约80％分布在0.1～1mm的范围内,扭黄茅、莎草、旱茅根系的直径和抗拉强度之间成负幂函数关系,芸香草两者间没有相关性.2)扭黄茅、莎草、旱茅、芸香草的根系可将土体的抗剪强度分别提高20.7％、85.3％、84.4％、16.1％.3)用WWM模型预测扭黄茅、早茅、莎草的提高土体抗剪能力,其预测值是实测值的3.59～10.83倍;用FBM模型的预测值是实测值的1.24～2.62倍.旱茅、莎草根系提高土体抗剪强度的能力强于扭黄茅和芸香草,在干热河谷的生态工程中可优先选用;对根系提高土体抗剪强度的预测,FBM模型要优于WWM模型.
|
| 关 键 词： | 草本植物根系 土体抗剪强度 Wu和Waldron模型 FBM模型 干热河谷 |
Soil anti-shear strength enhancement by indigenous herbaceous roots in Dry-hot Valley of Jinsha River and its modeling prediction |
| |
| DUAN Qingsong,WANG Jinxia,YANG Yang,ZI Shuhui,ZHANG Chuan,ZHANG Jiansheng,SUN Gaofeng,YU Jianxin.Soil anti-shear strength enhancement by indigenous herbaceous roots in Dry-hot Valley of Jinsha River and its modeling prediction[J].Science of Soil and Water Conservation,2017(4):87-95. |
| |
| Authors: | DUAN Qingsong WANG Jinxia YANG Yang ZI Shuhui ZHANG Chuan ZHANG Jiansheng SUN Gaofeng YU Jianxin |
| |
| Abstract: | Background] It is the typical fragile ecological environment in China,with dry and hot climate,serious soil erosion,and difficulty for vegetation restoration in the Dry-hot Valley of Jinsha River.Due to the rapid growth and adaptation to the local natural environment,indigenous herbaceous plants have unique advantage in restoration of ecological environment.The aim of this study is to provide the basis for plant selection and calculating their abilities of soil fixation in ecological restoration,slope protection,soil erosion control and other ecological projects in Dry-hot Valley of Jinsha River.Methods] The location of the test was in Wumao Township (E101°45'and N 25°43',with an elevation of 1280 m),Yuanmou County,Chuxiong Autonomous Prefecture of Yi Nationality,Yunnan Province,on January 2016 on hot-red soil.Heteropogon contortus,Eulaliopsis binata,Cymbopogon distans and Schizachyrium delavayi,widely distributed in Dry-hot Valley of Jinsha River,were selected to measure the shear strength of root-soil composites by in-situ direct shear test,and compared with bare soil.Five treatments with six replicates were set up.No significant difference about soil moisture and density of roots-contained soil were found in the treatments,except that density between the root-soil composites and bare soil.Shear strength and displacement of composite of the root-soil composites and bare soil with 200 mm length × 200 mm width × 100 mm height centering on the plant was test by the Pull Test Instrument for Bolt (ML-20,Qingdao Yifeng Instrument Manufacturing Co.,Ltd.).Root tensile strength was test by digital pull tester (SN100,Shadu Instrument Manufacturing Co.,Ltd.).The data such as root diameters,quantities and tensile strength was put to Wu & Waldron vertical root model (WWM) and Fiber bundle root enhancement model (FBM) respectively to predict the enhanced shear ability by roots.Results] 1) Root diameters of four herbs were distributed mainly in the range of 0.1-1 mm.The relationship between root diameter and tensile strength of H.contortus,E.binate and S.delavayi was a negative power function,while C.distans' had no correlation.2) Compared with bare soil,the soil shear strength was improved 20.7％,85.3％,84.4％ and 16.1％,respectively by the roots of H.contortus,E.binate,S.delavayi and C.distans.3) The predicted value was 3.59-10.83 times of the measured value,by using WWM model to predict the shear capacity of the soil.The predicted value of the FBM model was 1.24-2.62 times of the measured value.Conclusions] The ability of E.binate to improve the shear strength of soil is stronger than S.delavayi,thus it could be selected as the priority of ecological construction in Dry-hot Valley of Jinsha River.FBM model was better than WWM model,in terms of prediction of shear strength of soil enhanced by roots. |
| |
| Keywords: | herbaceous roots soil anti-shear strength Wu & Waldron model Fiber bundle root enhancement model Dry-hot Valley |
| 本文献已被 万方数据 等数据库收录！ |
|
