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本文运用从TDR数据估算得到的液态水分量分析了内蒙古河套灌区土壤的冻融行进过程。根据液态水分量的变化,将冻土层区分为“完全冻结层”和“部分冻结层”。一方面,完全冻结层保持着0.05～0.1cm3cm-3的液态水分量垂直向下推进,而在其下方30～40cm厚的土壤为部分冻结土层,液态水分量出现了由0.1cm3cm-3到0.35～0.4cm3cm-3的剧烈变化,这部分土层随着时间的推移平行向下方推进的趋势。融解过程的速度要比冻结过程大得多。分析结果表明,部分冻结层在4月末到5月初,深度为70cm～90cm的剖面依然存在。
In this paper, the process of freezing and thawing of soil in Hetao Irrigation District in Inner Mongolia was analyzed by using the liquid water content estimated from TDR data. According to the change of liquid water, the permafrost zone is divided into “fully frozen layer” and “partially frozen layer”. On the one hand, the fully frozen layer maintains a liquid water content of 0.05-0.1 cm3 cm-3 and vertically descends while the 30-40 cm-thick soil beneath it partially fills the soil layer. The liquid water content appears from 0.1 cm3 cm-3 to 0.35 ~ 0.4cm3cm-3 dramatic changes in this part of the soil with the passage of time parallel to the downward trend. The melting process is much faster than the freezing process. The results show that the section with a depth of 70cm ~ 90cm still exists in part of the frozen layer from late April to early May.