摘要
为探讨放牧和鼠害对黄河源区高寒退化草地土壤物理力学性质的影响,该研究选取位于黄河源区青海河南县高寒草地作为研究区,分别设置禁鼠、禁牧和自然3种影响条件,并将草地依次划分为未退化、轻度退化、中度退化、重度退化4种退化类型。通过测定3种影响条件下4种退化类型草地的土壤含水率、密度、含根量、黏聚力和内摩擦角,分析3种影响条件对不同退化类型草地土壤物理力学性质的影响;采用灰色关联分析法探讨不同退化类型草地土壤含水率、密度、含根量对土壤黏聚力的影响程度。结果表明:随着草地退化程度加剧,土壤含水率、含根量及黏聚力均呈逐渐降低的变化趋势,而土壤密度则呈逐渐增大的变化趋势。进一步研究表明,同一退化类型草地,土壤黏聚力由大至小依次为禁鼠、禁牧和自然条件,且禁鼠条件土壤黏聚力显著大于自然条件(P<0.05);未退化和轻度退化草地,土壤黏聚力与含根量间的关联度相对较高,关联度为0.706~0.778,而中度退化和重度退化草地,土壤黏聚力与密度和含水率间的关联度相对较大,关联度分别为0.586~0.785和0.622~0.779。研究结果对于科学有效防治黄河源区高寒草地退化及其所引起的水土流失、浅层滑坡等灾害现象的发生,具有实际指导意义。
This study aims to explore the effects of grazing and rodent damage on the soil physical and mechanical properties of alpine degraded grassland in the source region of the Yellow River.The alpine grassland in Henan County,Qinghai Province,China was selected as the study area.Three influence conditions were set,including the no-pika condition(Rodents,cattle and sheep were prohibited from eating and trampling),no-grazing condition(Cattle and sheep were forbidden to eat and trample,while rodents were allowed to eat and trample),and natural condition(Rodents,cattle and sheep were allowed to eat and trample)in this region.Four degradation types were divided into:the non-degraded,slightly,moderately,and heavily degraded grassland.Some parameters were measured,including the soil moisture content,density,root content,cohesion and internal friction angle of four degraded grasslands under three influence conditions.An analysis was made on the variation characteristics of soil physical and mechanical properties.The one-way analysis of variance(ANOVA)was utilized to evaluate the parameters under various influence conditions and degradation types.A nonparametric Wilcoxon test was carried out to determine the effects of three influence conditions on the internal friction angle of soil without considering degradation types.A grey correlation analysis was implemented to clarify the effects of soil moisture content,density and root content on the cohesion of soil in four degraded grasslands.The results showed that the soil moisture content,root content,and cohesion decreased gradually,whereas,the soil density increased gradually with the aggravation of grassland degradation.By contrast,there was less outstanding change in the internal friction angle of soil with the aggravation of grassland degradation.The cohesion of soil was ranked in the descending order under the same degradation type:no-pika,no-grazing,and natural condition.The internal friction angle of soil was ranked from large to small:no-grazing,no-pika,and natural cond
作者
邢光延
申紫雁
刘昌义
胡夏嵩
李希来
付江涛
卢海静
赵吉美
Xing Guangyan;Shen Ziyan;Liu Changyi;Hu Xiasong;Li Xilai;Fu Jiangtao;Lu Haijing;Zhao Jimei(College of Agriculture and Animal Husbandry,Qinghai University,Xining 810016,China;Department of Geological Engineering,Qinghai University,Xining 810016,China;Academy of Agriculture and Forestry,Qinghai University,Xining 810016,China;School of Civil Engineering,Qinghai University,Xining 810016,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2022年第16期180-189,共10页
Transactions of the Chinese Society of Agricultural Engineering
基金
青海省自然科学基金资助项目(2020-ZJ-906,2020-ZJ-904)
国家自然科学基金资助项目(41572306,42041006)
第二次青藏高原综合科学考察研究项目(2019QZKK0905-14)
地质资源与地质工程学科硕士点建设项目(41250103)。
关键词
物理力学性质
土壤
黏聚力
黄河源区
高寒草地
禁鼠
禁牧
physical and mechanical properties
soils
cohesion
the source region of the Yellow River
alpine grassland
no-pika
no grazing
