| 多年冻土区活动层冻融状况及土壤水分运移特征 |
| |
| 引用本文： | 焦永亮,李韧,赵林,吴通华,肖瑶,胡国杰,乔永平.多年冻土区活动层冻融状况及土壤水分运移特征[J].冰川冻土,2014,36(2):237-247. |
| |
| 作者姓名： | 焦永亮 李韧 赵林 吴通华 肖瑶 胡国杰 乔永平 |
| |
| 作者单位： | 中国科学院寒区旱区环境与工程研究所青藏高原冰冻圈观测研究站/冰冻圈科学国家重点实验室,甘肃兰州730000;中国科学院大学,北京100049;中国科学院寒区旱区环境与工程研究所青藏高原冰冻圈观测研究站/冰冻圈科学国家重点实验室,甘肃兰州730000 |
| |
| 基金项目： | 国家重大科学研究计划项目（2013CBA01803）；国家自然科学基金项目（41271081；41271086）；中国科学院“百人计划”项目（51Y251571）；冰冻圈科学国家重点实验室自主课题（SKLCS-ZZ-2010-03）资助 |
| |
| 摘 要： | 利用位于典型多年冻土区的唐古拉综合观测场2007年9月1日—2008年9月1日实测活动层剖面土壤温度和水分数据,对多年冻土区活动层的冻结融化规律进行研究;同时,对冻融过程中的活动层土壤液态水含量的变化特征进行分析,探讨了活动层内部土壤水分分布特征及其运移特点对活动层冻结融化过程的影响.结果表明:活动层融化过程从表层开始向下层土壤发展,冻结过程则会出现双向冻结现象.一个完整的年冻融循环中活动层冻结过程耗时要远远小于融化过程.活动层土壤经过一个冻融循环,土壤水分整体呈现下移的趋势,土壤水分逐步运移至多年冻土上限附近积累.同时,土壤水分含量和运移特征会对活动层冻融过程产生显著的影响.
|
| 关 键 词： | 多年冻土区 活动层 冻融循环 水分运移 |
| 收稿时间： | 2013-08-27 |
Processes of soil thawing-freezing and features of soil moisture migration in the permafrost active layer |
| |
| JIAO Yongliang,LI Ren,ZHAO Lin,WU Tonghua,XIAO Yao,HU Guojie,QIAO Yongping.Processes of soil thawing-freezing and features of soil moisture migration in the permafrost active layer[J].Journal of Glaciology and Geocryology,2014,36(2):237-247. |
| |
| Authors: | JIAO Yongliang LI Ren ZHAO Lin WU Tonghua XIAO Yao HU Guojie QIAO Yongping |
| |
| Institution: | 1. Cryosphere Research Station on the Qinghai-Tibet Plateau/State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
| |
| Abstract: | The freezing-thawing process and the dynamics of soil moisture were analyzed with the measured data of temperature and moisture within the active layer at the Cryosphere Research Station on Qinghai-Xizang Plateau from September 1, 2007 to September 1, 2008. Both freezing and thawing processes within the active layer developed from the surface to permafrost table. The freezing duration of soil within entire active layer was 25 days, while the thawing duration was nearly 4 months, The freezing process took much less time than the thawing process. The duration of the diurnal freezing-thawing cycles of topsoil decreased with depth. Frequent diurnal freezing-thawing cycles brought a daily cycle of soil water phase changing, which made the topsoil releasing and absorbing latent heat of phase change, changing the soil hydraulic and thermal properties. The migration of soil moisture had different characteristics at different stages of the freezing-thawing cycle. In general, during a freezing-thawing cycle, the soil water molecules will migrate downwards, i.e., soil moisture will transport from the entire active layer to the upper limit of permafrost. In the meantime, the content and migration of soil water have a significant impact on the seasonally freezing and thawing process within the active layer. |
| |
| Keywords: | permafrost regions active layer freezing-thawing cycle migration of soil moisture |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《冰川冻土》浏览原始摘要信息 |
| 点击此处可从《冰川冻土》下载免费的PDF全文 |
|
