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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.
It is of great ecological significance to quickly obtain the change of soil moisture in early spring sand dunes, since snowmelt water is an important water source for spring plant development in the Gurbantunggut Desert. In March and April of 2010, ground penetrating radar The results show that: 1) At the initial stage of snowmelt, the free water content of the soil in the top of sand dune is the highest and the sunny slope is the second, and the slush water flows slowly along the slope surface under the action of gravity, converging on the slope bottom, leading the initial snowmelt or even In the later period of snowmelt, the surface soil water content is slightly higher than that of the sunny slope due to the relative lagging of the snow cover of the shady slope and the ablation of the frozen soil, while the top of the sand dune has the highest amount of water transfer during the snowmelt period The surface is the most dry; 3) By comparing with the synchronous measurement of time domain reflectometer, the measurement accuracy of GPR is effectively controlled within 0.03, and the continuous data provided by GPR is more conducive to grasp the soil moisture content from the details Which provides a scientific and effective technical means for the dynamic study of soil moisture at the small and medium scales.