摘要
[目的]探讨黄河源区高寒环境禁牧条件对原生草地和退化草地根-土复合体力学强度影响,阐明禁牧对植被恢复的作用,为黄河源区草地恢复以及地质灾害防治提供理论参考。[方法]选取黄河源河南县地区未禁牧、禁牧期1 a、禁牧期4 a、禁牧期10 a这4种工况下的草地作为研究对象,通过直剪试验得到复合体黏聚力和内摩擦角,环刀称重法得到密度,烘干法得到含水率,采用SPSS软件分析了不同禁牧期草地植物根径、土体密度、土体含水率、含根量与根-土复合体黏聚力之间的相关关系。[结果](1)根-土复合体黏聚力与含水率之间呈显著负相关关系(p<0.05),未禁牧草地植物根径与根-土复合体黏聚力之间呈现极显著正相关关系(R=0.68,p<0.01),根数与根-土复合体黏聚力之间呈极显著正相关关系(R=0.85,p<0.01);1 a禁牧期土体密度与根-土复合体黏聚力c值之间呈显著正相关关系(R=0.56,p<0.05)。(2)随着禁牧年限增加,原生与退化草地土体平均黏聚力c值呈增大的变化趋势,其中10 a禁牧期原生草地黏聚力c值较未禁牧原生草地平均黏聚力增加幅度为6.39%;10 a禁牧期退化草地黏聚力c值较未禁牧平均黏聚力增加幅度为8.16%。[结论]实施禁牧提高黄河源区草地根-土复合体黏聚力,有利于防治黄河源区草地退化及水土流失。
[Objective]The aims of this study are to explore the impact of the ban on grazing in the high-altitude and cold environment of the Yellow River source region on the mechanical strength of the root-soil composite system in native grasslands and degraded grasslands,to clarify the role of the ban on vegetation restoration,and to provide theoretical reference for the restoration of grasslands in the Yellow River source region and geological disaster prevention and control.[Methods]The grassland in Henan County of the Yellow River source region was selected as the research object under four conditions of no grazing,1-year,4-year and 10-year of grazing prohibition period.The correlation between root diameter,soil density,soil moisture content,root content and root-soil composite system cohesion of grassland plants in different grazing prohibition periods was discussed.[Results](1)There was a significant negative correlation between cohesion and water content of root-soil composite system(p<0.05).There was a significant positive correlation between root diameter and cohesion of root-soil composite system(R=0.68,p<0.01).There was a significant positive correlation between root number and cohesion of root-soil composite system(R=0.85,p<0.01).There was a positive correlation between soil density and cohesion c value of root-soil composite system during 1-year grazing exclusion period(R=0.56,p<0.05).(2)With the increase of grazing prohibition years,the average cohesion c value of native and degraded grassland soil increased,and the cohesion c value of native grassland in 10-year grazing prohibition period increased by 6.39%compared with the average cohesion of native grassland without grazing prohibition.The cohesion c value of degraded grassland during the 10-year grazing exclusion period increased by 8.16%compared with the average cohesion of non-grazing.[Conclusion]The implementation of grazing prohibition to improve the cohesion of grassland root-soil composite system in the source region of the Yellow River is conducive to the prevention and control of grassland degradation and soil erosion in the source region of the Yellow River.
作者
梁晓娜
刘昌义
胡夏嵩
付江涛
邢光延
何伟鹏
岳磊
吕伟涛
Liang Xiaona;Liu Changyi;Hu Xiasong;Fu Jiangtao;Xing Guangyan;He Weipeng;Yue Lei;LüWeitao(School of Geological Engineering,Qinghai University,Xining 810016,China;Academy of Agricultural and Forestry Sciences,Qinghai University,Xining 810016,China)
出处
《水土保持研究》
北大核心
2025年第2期224-233,共10页
Research of Soil and Water Conservation
基金
国家自然科学基金(42041006)
青海省自然科学基金(2020-ZJ-906)。
关键词
黄河源区
根-土复合体
禁牧期
原生草地
退化草地
抗剪强度指标
the source region of the Yellow River
root-soil composite system
grazing ban period
native grassland
degraded grassland
shear strength index
