| 利用探地雷达观测分析早春融雪前后沙丘表层土壤含水量的时空分布 |
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| 引用本文： | 秦艳芳,陈曦,周可法,孙莉,张捷斌. 利用探地雷达观测分析早春融雪前后沙丘表层土壤含水量的时空分布[J]. 冰川冻土, 2012, 34(3): 690-697. DOI: 10.7522/j.issn.1000-0240.2012.0085 |
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| 作者姓名： | 秦艳芳 陈曦 周可法 孙莉 张捷斌 |
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| 作者单位： | 1. 中国科学院 新疆生态与地理研究所, 新疆 乌鲁木齐 830011;2. 中国科学院 研究生院, 北京 100049;3. 中国科学院 新疆矿产资源研究中心, 新疆 乌鲁木齐 830011 |
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| 基金项目： | 国家自然科学基金项目，新疆自治区科技支疆项目 |
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| 摘 要： | 积雪融水是古尔班通古特沙漠春季植物发育的重要水源, 快速获取早春沙丘的土壤水分变化具有十分重要的生态学意义. 2010年3、 4月分别使用探地雷达进行了多次测量实验, 结果显示: 1)融雪初期, 沙丘顶部土壤的自由水含量最大, 阳坡次之, 且融雪水在重力作用下沿坡面侧向缓慢流动, 在坡底汇集, 主导了融雪初期乃至整个春季沙丘表层土壤水分的分布格局; 2)融雪后期, 由于阴坡积雪和冻土消融相对滞后, 表层土壤含水量略高于阳坡, 而沙丘顶部由于融雪最早且融雪期间水分转移最多而表面最为干燥; 3)通过与时域反射仪的同步测量结果对比, 探地雷达的测量精度被有效控制在0.03范围内, 且探地雷达提供的连续数据更有利于从细节上把握土壤含水量的变化趋势, 为中小尺度土壤水分的动态研究提供了一种科学、 有效的技术手段.
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| 关 键 词： | 探地雷达 沙丘表层土壤含水量 地面直达波 积雪融化 古尔班通古特沙漠 |
| 收稿时间： | 2011-11-08 |
| 修稿时间： | 2012-02-29 |
Using GPR to Sound the Spatial and Temporal Distributions of Dune Surface Soil Water Contents before and after Snowmelt in the Early Spring |
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| QIN Yan-fang,CHEN Xi,ZHOU Ke-fa,SUN Li,ZHANG Jie-bin. Using GPR to Sound the Spatial and Temporal Distributions of Dune Surface Soil Water Contents before and after Snowmelt in the Early Spring[J]. Journal of Glaciology and Geocryology, 2012, 34(3): 690-697. DOI: 10.7522/j.issn.1000-0240.2012.0085 |
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| Authors: | QIN Yan-fang CHEN Xi ZHOU Ke-fa SUN Li ZHANG Jie-bin |
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| Affiliation: | 1 (1.Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,ürümqi Xinjiang 830011,China; 2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;3.Xinjiang Research Center for Mineral Resources,Chinese Academy of Sciences,ürümqi Xinjiang 830011,China) |
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| Abstract: | Snow melt provides an important water resource to the Gurbantunggut Desert,and rapid acquiring soil moisture change in the early spring of desert regions is of great significance to monitor the germination and growth conditions of plants.In this study,ground-penetrating radar(GPR) is used to sound the spatial and temporal variations of dune near-surface soil water contents in March and April,2010.The results show that: 1) in the early period of snowmelt,the dune top soil has the highest free water content,followed by the sunny slope soil.Furthermore,the snowmelt water is collected in the slope bottoms under the influence of gravity,which initially manages the soil moisture distribution pattern on dune surface in the whole spring;2) after snowmelt,the lagged melting of snow and thawing of frozen soil in the shady slopes result in a higher water content than that in the sunny slopes,and consequently a lowest one on the dune top;3) comparing with simultaneously TDR sounding soil water contents,the GPR sounding precision can be controlled within a range of 0.03.Therefore,GPR sounding is able to provide continuous data to show the soil moisture changes in detail,performing a scientific and effective technique for researching soil moisture dynamics in small and medium scales. |
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| Keywords: | Ground-penetrating radar(GPR) soil water content on dune surface direct ground wave snow melt Gurbantunggut Desert |
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