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介绍了Water Mark 900M系统原理及其在密云水库上游农田土壤水吸力监测中的应用,并分析了2010年8月土壤水吸力的动态变化情况。结果表明Water Mark 900M系统可以较好地应用于农田土壤水吸力动态监测。土壤温度与水吸力显著负相关,降雨是影响土壤水吸力变化的一个重要因素,连续多场降雨可以使0~100 cm内土层水吸力直线下降。30 cm深度水吸力变化与60 cm、100 cm深度相比较轻微。
The principle of Water Mark 900M system and its application in the monitoring of soil water suction in the upper reaches of Miyun Reservoir are introduced. The dynamic changes of soil water suction in August 2010 are analyzed. The results show that the Water Mark 900M system can be applied to the dynamic monitoring of farmland soil water suction. Soil temperature is significantly negatively correlated with water suction. Rainfall is an important factor that affects the change of soil water suction. Continuous multiple rainfalls can cause soil water suction within 0-100 cm to decrease linearly. Changes in water suction at a depth of 30 cm are slight compared to those at a depth of 60 cm and 100 cm.