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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 •

### 青藏高原不同高寒生态系统类型下多年冻土活动层水热过程差异研究

1. 中国科学院西北生态环境资源研究院
• 收稿日期:2017-04-14 修回日期:2017-09-06 出版日期:2018-03-08
• 通讯作者: 蒋观利
• 基金资助:

### Study on the differences of thermal-moisture dynamics in the active layer of permafrost in different alpine ecosystems on the Tibetan Plateau

1.
• Received:2017-04-14 Revised:2017-09-06 Online:2018-03-08
• Supported by:

Abstract: Based on the observation within the active layer beneath different alpine ecosystems, including alpine grassland, alpine swamp meadow and alpine meadow, in Beiluhe area on the Tibetan Plateau, the thermal-moisture dynamics were studied. The results show that the differences are evident about the aspects such as active layer depth, initial times and duration of freeze and thaw, and spatial moisture distribution. Beneath alpine grassland, the active layer has deepest depth, earliest initial thawing and the longest duration of thawing among the all three types of ecosystemsfollowing by that beneath alpine swamp meadow and then by alpine grassland. Beneath the alpine grassland water content within the active layer increases from the top to the bottom, most of the water concentrates in the middle lower part. Beneath alpine swamp meadow water content is relatively even. Beneath alpine swamp meadow water content gradually reduces from top to bottom, and the closer to surface the larger the soil moisture content is. Further analysis of the monitoring data finds that there are obvious differences in ground surface temperature and air temperature, organic material content, n-factor and the statistical characteristics of standard deviation on near surface temperature among various alpine ecosystems. The study indicates that the thermal-moisture dynamics are closely related to the alpine ecosystem which affects the near surface energy fluxes and makes difference in the earth-atmosphere heat exchange and then changes the temperature and moisture characteristics of the active layer.

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