| 祁连山俄博岭地区热融洼地与冻胀草丘活动层融化深度差异性对比研究 |
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| 引用本文： | 杜冉,彭小清,金浩东,魏庆,孙文,贾诗超,范成彦,王昆,魏思浩,赵耀华,Oliver W.FRAUENFELD.祁连山俄博岭地区热融洼地与冻胀草丘活动层融化深度差异性对比研究[J].冰川冻土,2022,44(1):188-202. |
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| 作者姓名： | 杜冉 彭小清 金浩东 魏庆 孙文 贾诗超 范成彦 王昆 魏思浩 赵耀华 Oliver W.FRAUENFELD |
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| 作者单位： | 1.兰州大学 资源环境学院，甘肃 兰州 730000;2.Department of Geography，Texas A&M University，College Station，TX 77843-3147，USA |
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| 基金项目： | 国家自然科学基金项目（42171120;42161160328;41801028）；;兰州大学中央高校基本科研业务费专项资金项目（lzujbky-2021-72;lzujbky-2021-ct13）资助； |
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| 摘 要： | 全球气候变暖背景下，活动层厚度的加深是多年冻土退化最主要表现特征之一，但其变化存在强烈的空间异质性，尤其是在复杂山地环境显得更为突出。以祁连山黑河流域俄博岭为研究区，采用钎探的方法，在样方尺度上探究冻胀草丘和热融洼地两种微地貌下伏活动层融化深度的差异性。结果表明：6—10月，冻胀草丘和热融洼地活动层融化深度的变化范围分别为（44.48±4.97）~（118.38±20.94） cm和（29.22±7.42）~（93.40±15.45） cm，且冻胀草丘活动层融化深度加深的速度快于热融洼地。样方尺度上，两种微地貌下伏活动层最大融化深度差异比较明显，冻胀草丘处的活动层融化深度是热融洼地的2倍之多，这主要由不同微地貌之间土壤含水量的差异而导致的。另外，借助一维热传导模型模拟了两种微地貌下的活动层热状态，结果表明土壤水分差异性致使热融洼地的融化深度较冻胀草丘浅。山地环境条件下，不同微地貌之间活动层融化深度差异性研究有助于为未来开展高精度活动层融化深度制图提供可靠的技术支撑。
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| 关 键 词： | 活动层 融化深度 微地貌 祁连山 黑河流域 |
| 收稿时间： | 2021-03-11 |
| 修稿时间： | 2021-06-25 |
Comparative study on active layer depth differences between hummocks and thermokarst depressions in the Eboling area of the Qilian Mountains |
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| DU Ran,PENG Xiaoqing,JIN Haodong,WEI Qing,SUN Wen,JIA Shichao,FAN Chengyan,WANG Kun,WEI Sihao,ZHAO Yaohua,Oliver W.FRAUENFELD.Comparative study on active layer depth differences between hummocks and thermokarst depressions in the Eboling area of the Qilian Mountains[J].Journal of Glaciology and Geocryology,2022,44(1):188-202. |
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| Authors: | DU Ran PENG Xiaoqing JIN Haodong WEI Qing SUN Wen JIA Shichao FAN Chengyan WANG Kun WEI Sihao ZHAO Yaohua Oliver WFRAUENFELD |
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| Institution: | 1.College of Earth and Environmental Sciences，Lanzhou University，Lanzhou 730000，China;2.Department of Geography，Texas A&M University，College Station，TX 77843-3147，USA |
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| Abstract: | Active layer deepening is a key characteristic of permafrost degradation due to global warming. Active layer variability shows significant spatial heterogeneity， especially in complex mountain environments. Based on active layer thaw depth probing in the Eboling area’s Heihe River basin of the Qilian Mountains， this study quantifies the differences in thaw depth in two types of environments： hummocks and thermokarst depressions. Focusing on the quadrate scale from June to October in 2019—2020， results indicate that the active layer depth （44.48±4.97）~（118.38±20.94） cm in hummocks， and （29.22±7.42）~（93.40±15.45） cm in thermokarst depressions. Furthermore， thawing occurs faster in hummocks than in thermokarst depressions. At the quadrate scale， the maximum thaw depth of hummocks is twice as much as that of thermokarst depressions， caused mainly by differences in soil water content. In addition， a one-dimensional heat conduction model is used to simulate the thermal state of active layer under the two kinds of microtopography. Results verify that the soil water content differences make thaw depth in thermokarst depressions shallower than in hummocks. In mountain environments， characterizing differences in thaw depth for different microtopography types serves as an important basis for providing reliable future high-precision mapping of active layer depth. |
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| Keywords: | active layer thaw depth microtopography Qilian Mountains Heihe River basin |
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