6种草本植物根系土壤抗冲性

Soil anti-scouribility of roots of six kind of herbs

研究了紫苜蓿（Medicago sativa）、黑麦草（Loliumperenne）、稗（Echinochloa crusgali）、披碱草（Elymus dahuricus）、白车轴草（Trifolium repens）、紫羊茅（Festuca rubra）根系分布特征及根系对土壤抗冲性的增强效应。土壤抗冲性测定采用原状土冲刷水槽法。结果表明：（1）根系生物量主要分布在0~20cm深的土层内,根系生物量随土层深度增加而减少;（2）根系对土壤抗冲性有较强的增强作用,随冲刷坡度增大,土壤抗冲性减弱,抗冲指数和根系生物量呈显著的正相关关系;（3）6种草本中,黑麦草对土壤抗冲性的增强效应最强,建议推广使用。

An experimem was conducted to study the root morphological distribution and the enhancement effects on soil anti-scouribility of roots of Medicago sativa, Lolium perenne, Echinochloa crusgali, Elymus dahuricus, Trifolium repens, Festuca rubra. The soil anti-scouribility was identified by using the undisturbed soil trough scouring method. The results indicated that： （1） The root biomass were mainly distributed in 0-20cm layer of soft and the root biomass decreased with the increase of the soil depth. （2） Roots had remarkable positive enhancement effects on soil anti-scouribility. The Soil anti-scouribility faded with the increase of the slope. Root biomass was significantly positive correlation to soil anti-scouribility values. （3）Among six kind of herbs, Roots of Lolium perenne had remarkable positive enhancement effects on Soil anti-scouribility. We recommend that Lolium perenne could be widely popularized and applied.