| 青藏高原多年冻土和季节性冻土区土壤水分变化及其与降水的关系 |
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| 引用本文： | 吴小丽,刘桂民,李新星,纪庚好,李莉莎,毛 楠,徐海燕,吴晓东.青藏高原多年冻土和季节性冻土区土壤水分变化及其与降水的关系[J].水文,2021,41(1):73-78,101. |
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| 作者姓名： | 吴小丽 刘桂民 李新星 纪庚好 李莉莎 毛 楠 徐海燕 吴晓东 |
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| 作者单位： | 兰州交通大学环境与市政工程学院;中国科学院西北生态环境资源研究院 |
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| 基金项目： | 国家自然科学基金项目(41661013、41871060、41861011)。 |
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| 摘 要： | 使用地面观测数据对欧洲空间局(ESA)发布的气候变化倡议(CCI)土壤水分产品进行精度校准,结合青藏高原及其周边降水气象站数据,分析土壤水分动态变化及其与降水的关系。结果表明:(1)校正后的CCI主被动组合产品所反演的青藏高原土壤水分获得了更高的精度,且显示1986~2016年暖季土壤水分在多年冻土区的逐年变化更为稳定。(2)高原土壤水分空间分布与降水分布高度一致,降水是该地区土壤水分的重要调节因子。多年冻土区暖季土壤水分与降水的相关性较低,而季节性冻土区较高,原因是多年冻土的存在可能有利于维持土壤水分的稳定性。多年冻土对于土壤水分有着重要的调节作用,气候变暖所导致的多年冻土退化,会降低土壤水分的调节能力,进而影响到青藏高原生态系统和水文循环。
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| 关 键 词： | 青藏高原 多年冻土 土壤水分 CCI产品 降水 |
Variation of Soil Moisture and Its Relation with Precipitation of Permafrost and Seasonally Frozen Soil Regions on the Qinghai-Tibet Plateau |
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| WU Xiaoli,LIU Guimin,LI Xinxing,JI Genghao,LI Lisha,MAO Nan,XU Haiyan,WU Xiaodong.Variation of Soil Moisture and Its Relation with Precipitation of Permafrost and Seasonally Frozen Soil Regions on the Qinghai-Tibet Plateau[J].Hydrology,2021,41(1):73-78,101. |
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| Authors: | WU Xiaoli LIU Guimin LI Xinxing JI Genghao LI Lisha MAO Nan XU Haiyan WU Xiaodong |
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| Institution: | (School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Cryosphere Research Station on the Qinghai-Tibet Plateau,State Key Laboratory of Cryospheric Science,Northwest Institute of the EcoEnvironment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China) |
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| Abstract: | Based on the field observation data to calibrate the Climate Change Initiative(CCI)soil moisture products released by the European Space Agency(ESA)and the meteorological data from the Qinghai-Tibetan Plateau(QTP)and its surrounding areas,this paper analyzed the soil moisture changes and its relationship with precipitation.The results show that,(1)Soil moisture on the QTP retrieved by the calibrated CCI products has high accuracy,and the annual changes of soil moisture in permafrost areas are more stable than that in seasonally frozen soil areas during warm seasons from 1986 to 2016;(2)Spatial distribution of soil moisture in the plateau is highly consistent with the distribution of precipitation,and precipitation is the main controlling factor for soil moisture in the region.Moreover,the correlation efficients between soil moisture and precipitation in permafrost regions during the warm seasons are lower than that in seasonally frozen ground areas.This can be partly explained that the permafrost existence could stabilize soil moisture.In addition,permafrost has important effects on soil moisture,and permafrost degradation caused by climate warming will reduce the stabilization of soil moisture and further deteriorate the ecosystem and hydrological cycle on the QTP. |
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| Keywords: | Qinghai-Tibet Plateau permafrost soil moisture CCI products precipitation |
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