草原土壤胀缩运动的发生机制研究  

Study on mechanism of expansion and contraction of soil in grassland

作　　者：田洪艳[1] 李质馨[1] 周道玮[2] 窦肇华[1] 鲁质博[1] 侯瑜[1] 徐冶[1] 刘晓冬[1] 

机构地区：[1]第四军医大学吉林军医学院,吉林长春132013 [2]东北师范大学国家草地生态工程实验室,吉林长春130024

出　　处：《干旱地区农业研究》2003年第1期86-90,共5页Agricultural Research in the Arid Areas

基　　金：国家重点基础规划项目(G2000018606)

摘　　要：着重调查草原地裂缝的空间静态分布及时间动态分布,并调查土壤及植被状况,研究草原土壤胀缩运动的发生机制,结果表明:土壤的开裂主要与土壤粘粒(<0.001mm)含量有关,土壤粘粒含量越高,土壤胀缩程度越大。认为土壤胀缩运动主要决定于土壤粘粒的含量,同时季节性冻融作用与干湿交替作用是导致土壤胀缩运动的直接因素。The research on the mechanism of expansion and contraction of soil in grassland was conducted by counting different types of cr evices, investigating the space and time distribution of the crevics, and look ing into the state of soil and vegetation. The results shows that the expansion and contraction of soil is mainly related to the content of clay (<0.001mm), th e higher the content of clay, the greater the degree of expansion and contractio n. Moreover, seasonal freezing and melting and seasonal drying and wett ing are the direct factors causing soil to expand and contract.

关 键 词：草原土壤 土壤粘粒 植被状况 时间动态 含量 运动 冻融作用 地裂缝 季节性 

分 类 号：S812.2[农业科学—草业科学] S153.3[农业科学—畜牧学]