摘要
以乌兰布和沙漠和库布齐沙漠为研究区域,在流动沙丘、半固定沙丘和固定沙丘分别采集表层(0~20 cm)、中层(20~40 cm)和底层(40~60 cm)沙样,分析了沙漠不同深度沙样的粒径组成、矿物成分、风化程度及三者之间的关系。针对不同植被覆盖区域进行采样,研究了沙漠生态修复与风化程度、黏性矿物含量之间的关系,揭示了沙漠矿物风化程度与生态修复的互馈关系。结果表明:沙漠表层沙样粒径小于中层和底层沙样,黏性矿物含量高于中层和底层;风化程度越高,黏性矿物含量越高,粒径组成越细。植被盖度与矿物风化程度和黏性矿物含量之间具有良好的关系,植被盖度由4%增加至18%~22%时,黏性矿物含量和风化程度增加速率较快,之后增加速率减小。矿物风化程度随生态修复的时间逐渐增加,对库布齐沙漠来说,随着植被盖度和风化程度增加,黏性矿物中伊利石含量显著增加。
Taking Ulanbuh Desert and Kubuqi Desert as the research area,sand samples of 3 different surface depth(the surface layer:0~20cm;the middle layer:20~40cm;the bottom layer 40~60cm underground)were collected respectively from the fixed dune,semifixed dune and mobile dune from each dessert to analyze the triadic relation between granulometric composition,mineral constituent and the degree of weathering.The relationship between the weathering level and cohesive mineral content and the desert ecological restoration was studied by sampling in different vegetation coverage area,and the mutualism relation ship between the degree of mineral weathering and ecological restoration was revealed.The consequence shows that,the sand grain size in the surface level is smaller than the middle and bottom level;the higher the degree of weathering,the higher the cohesive mineral content and the smaller the grain size.There is a good relationship between the degree of mineral weathering and the cohesive mineral content.Their in crease rate rises when the vegetation coverage rises from 4%to 18%~22%,and then the rate falls subsequently.It is a gradual growth of the ecological restoration followed by the degree of mineral weathering.For the Kubuqi Desert,the illite content in the cohesive mineral increased significantly with the growth of weathering and vegetation coverage level.
作者
田世民
袁榆梁
李锦荣
王远见
江恩慧
TIAN Shimin;YUAN Yuliang;LI Jinrong;WANG Yuanjian;JIANG Enhui(Key Laboratory of Yellow River Sediment,Yellow River Institute of Hydraulic Research,YRCC,Zhengzhou 450003,China;Henan Water&Power Engineering Consulting Co.,Ltd,Zhengzhou 450016,China;Institute of Water Resources for Pastoral Area,MWR,Hohhot 010020,China)
出处
《水利学报》
EI
CSCD
北大核心
2020年第4期410-420,共11页
Journal of Hydraulic Engineering
基金
国家重点研发计划项目(2018YFC0407401)
国家自然科学基金项目(51979120)
中央级公益性科研院所基本科研业务费专项(HKY-JBYW-2018-07,HKY-JBYW-2019-10,HKY-JBYW2019-19)。
关键词
沙漠
黏性矿物
风化
生态修复
互馈关系
desert
cohesive mineral
weathering
ecological restoration
mutualism
作者简介
田世民(1981-),博士,教授级高级工程师,研究方向为河流演变与河流生态。E-mail:tsm1981@163.com;通讯作者:江恩慧(1963-),博士,教授级高级工程师,研究方向为河流泥沙。E-mail:jiangenhui@hky.yrcc.gov.cn。
