草业学报2017，Vol.26Issue(7)：45-54,10.DOI:10.11686/cyxb2016353
香根草和马唐的根系特征及对坡地紫色土抗侵蚀性的影响
Root distribution characteristics of Vetiveria zizanioides and Digitaria sanguinalis and their effects on the anti-erodibility of purple soil in slopelands
摘要
Abstract
The aim of this study was to investigate the characteristics of grass root distribution and its effects on soil anti-erodibility in purple soil areas.Two grass species,Vetiveria zizanioides and Digitaria sanguinalis,growing on slopelands were chosen as the experimental materials.Root and soil samples were taken from 0-10,10-20,and 20-30 cm soil depths.Root parameters,soil shear strength,and anti-scourability of the rootsoil system were measured to explore the relationship between root distribution and soil anti-erodibility.The values of overall root parameters and diameter parameters (root length density,root surface area density,root volume density,and root weight density) were higher for V.zizanioides roots than for D.sanguinalis roots in 0-30 cm soils.Compared with D.sanguinalis roots,V.zizanioides roots were more conducive to reducing soil bulk density,improving soil microaggregate composition,and increasing the soil organic carbon content.Soil shear strength and anti-scourability of the root-soil systems were highest in 0-10 cm soils and lowest in 20-30 cm soils.The values of both parameters were higher for V.zizanioides than for D.sanguinalis.A correlation analysis indicated that 1.0＜d (diameter)≤2.0 mm was the critical diameter class affecting cohesion and the anti-scourability index,followed by d≤l.0 mm.The results of this study provide a theoretical basis for vegetation management strategies to conserve soil and water in purple soil areas.关键词
根系/内摩擦角/粘聚力/抗冲指数/紫色土Key words
root system/internal friction angle/cohesion/anti-scourability index/purple soil引用本文复制引用
王润泽,谌芸,李铁,彭石磊,刘志鹏,单志杰..香根草和马唐的根系特征及对坡地紫色土抗侵蚀性的影响[J].草业学报,2017,26(7):45-54,10.基金项目
国家重点研发计划项目(2016YFC0502303),国家自然科学基金(41501288),中央高校基本科研业务费专项(XDJK2015C170,XDJK2014C103)和水利部公益性行业科研专项经费项目(201501045)资助. （2016YFC0502303）
