| Study on mechanism of expansion and contraction of soil in grassland |
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| DOI：10.7606/j.issn.1000-7601.2003.01.20 |
| Key Words: expansion and contraction of soil content of clay crevic e of grassland |
| Author Name | Affiliation | | TIAN Hong-yan | Jilin Military Medical College,The Fourth Military Medical University,Changchun, Jilin 132013,China | | LI Zhi-xin | Jilin Military Medical College,The Fourth Military Medical University,Changchun, Jilin 132013,China | | ZHOU Dao-wei | National Laboratory of Grassland Ecological Engineering, Northeast Normal University,Changchun,Jilin 130024,China | | DOU Zhao-hua | Jilin Military Medical College,The Fourth Military Medical University,Changchun, Jilin 132013,China | | LU Zhi-bo | Jilin Military Medical College,The Fourth Military Medical University,Changchun, Jilin 132013,China | | HOU Yu | Jilin Military Medical College,The Fourth Military Medical University,Changchun, Jilin 132013,China | | XU Ye | Jilin Military Medical College,The Fourth Military Medical University,Changchun, Jilin 132013,China | | LIU Xiao-dong | Jilin Military Medical College,The Fourth Military Medical University,Changchun, Jilin 132013,China |
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| Abstract: |
| 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. |
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