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• CN 62-1072/P
• ISSN 1000-0240
• 创刊于1979年
• 主管单位：中国科学院
• 主办单位：中国科学院寒区旱区
•                  环境与工程研究所
•                  中国地理学会

• 冰冻圈变化 •

### 青藏高原多年冻土区高寒草甸土壤水分入渗随冻融和海拔的变化

1. 1. 中国科学院水利部成都山地灾害与环境研究所
2. 中国科学院大学
• 收稿日期:2017-06-07 修回日期:2017-07-19 出版日期:2018-03-08
• 通讯作者: 王根绪
• 基金资助:

### A study on the changes of soil water infiltration in alpine meadow of permafrost regions in the Tibetan Plateau

1.
• Received:2017-06-07 Revised:2017-07-19 Online:2018-03-08
• Supported by:

Abstract: A typical slope of the permafrost regions was divided into three slope positions: the low (L), middle (M) and high (H) parts. The vegetation coverage of 92%, 60% and 30% for each slope position were selected as study objects to determine the soil water infiltration process by double ring infiltration apparatus. The environmental factors,which impact the process of soil infiltration, were analyzed and model simulation had done based on soil physical properties and soil water. The results showed that the soil water infiltration of different vegetation coverage in the study area had obvious difference during the freezing and thawing process of the active layer, and the initial soil water content had a good negative correlation with the initial infiltration rate. The stable infiltration rate was: vegetation coverage of 92% (0.61 mm min-1) > vegetation coverage of 60% (0.50 mm min-1) > vegetation coverage of 30% (0.29 mm min-1) during the period of active layer thawing, and vegetation coverage of 60% (0.56 mm min-1) > vegetation coverage of 30% (0.39 mm min-1) > vegetation coverage of 92% (0.26 mm min-1) during the beginning period of active layer freezing. The soil water infiltration rate had a significant difference among slope positions and was closely related to the freezing-thaw cycle, mainly reflected in that the infiltration rate decreased with the slope position downwards; the infiltration rate during the beginning period of freezing was less than that during the thawing period on the same slope position. During the whole infiltration stage, the cumulative infiltration at the slope top was the maximum, showing a better infiltration performance. The environmental factors influencing the infiltration of alpine meadow soil were bulk density, organic matter content and particle size. It was concluded that in the source regions of the Yangtze River the general empirical model f(t)=a+bt-n is more suitable for the period of active layer thawing to study soil water infiltration in alpine meadow in the study area, while the Horton model f(t)=ic+(i0-ic)e-kt is more suitable for the beginning period of active layer freezing.

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