摘要
在标准径流观测小区采用多年生草本扭黄茅(Heteropogon contortus)和一年生草本三芒草(Aristida adscensio⁃nis)按不同比例构建植被群落,通过观测其径流量、泥沙流失量等特征,探讨两种生活型禾本科牧草在干热河谷区水土保持中的作用。结果表明:由一种多年生禾草和一种一年生禾草构成的水土保持功能型群落,当以盖度表征的两功能型物种功能性状达到均衡时,群落水土保持功能最大,此时群落具有最小的径流及泥沙流失量;一年生或多年生单一物种组成的群落,其水土保持功能与两个物种均有的群落表现出不同的调节能力,多年生植物的作用要大于一年生植物。萨瓦纳群落的径流调节功能可能主要来源于一年生及多年生禾草的混合适应机制,就干热河谷而言,应当重视以扭黄茅为代表的多年生植物促进水分在土壤层均匀分布的作用。
It built vegetation communities according to different proportions by observing the characteristics of runoff and sediment loss and using perennial herb Heteropogon contortus and annual herb Aristida adscensionis in standard runoff observation plot and discussed the effects of two life-form gramineous forages on soil and water conservation vegetation in dry hot valley.The outcomes show that a)a functional community of soil and water conservation composes of a perennial grass and an annual grass,when the functional coverage of the two functional species represented by coverage reaches equilibrium,the soil and water conservation function of the community reaches the maximum,at this time,the community has the minimum runoff and sediment loss and;b)in the function of soil and water conservation,the community consisting of an annual or perennial single species show different regulatory abilities with the communities with both species.The role of perennials is greater than that of annuals.It is suggested that the runoff regulation function of Savanna community mainly comes from the mixed adaptation mechanism of perennial grasses and annual grasses.In terms of the dry hot valley,attention should be paid to the role of perennial plants represented by Heteropogon contortus in promoting the uniform distribution of water in the soil layer.
作者
杨淏舟
王艳丹
岳学文
余建琳
史亮涛
冉林
何光熊
YANG Haozhou;WANG Yandan;YUE Xuewen(Institute of Tropical Eco-Agricultural Research,Yunnan Academy of Agricultural Sciences,Yuanmou,Yunnan 651300,China;Jinlei Soil and Water Conservation Science and Technology Demonstration Zone,Yuanmou,Yunnan 651300,China)
出处
《中国水土保持》
2021年第10期60-63,M0003,共5页
Soil and Water Conservation in China
基金
云南省科技厅重点研发计划项目(2019BC001-02)。
关键词
地表径流
壤中流
界面流
群落功能
干热河谷
surface runoff
interflow
interfacial flow
community function
dry hot valley
