| Cite this article: | 高建东,许春芳,杜朝阳,等.墒情监测合理深度暨数据处理方法的探讨[J].灌溉排水学报,,():-. |
| GAO Jiandong,XU Chunfang,DU Chaoyang,et al.墒情监测合理深度暨数据处理方法的探讨[J].灌溉排水学报,,():-. |
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| Study on Reasonable Depth of Soil Moisture Monitoring and Data Processing Methods |
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GAO Jiandong1, XU Chunfang2, DU Chaoyang3, LIU Enmin3
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1.Shandong Water Development Group Co,Ltd;2.Lingcheng Bureau of Water Resource;3.Institute of Geographic Sciences and Natural Resources Research,CAS
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| Abstract: |
| 【Objective】The moisture sensor for monitoring soil moisture in farmland is prone to be damaged by agricultural machinery in the tillage layer, but it is not conducive to reflect soil moisture dynamic of the tillage soil layer when the sensors are buried too deep. Therefore, this contradiction is a difficult problem for constructing monitoring moisture network. 【Method】This study conducted a long-term monitoring experiment of soil water profiles along the depth of 0-70cm and analyzed the characteristics and variation patterns of soil water profiles. 【Result】Soil moisture at different depths varies significantly for the representativeness of the average soil moisture in the root or tillage layers. Here, the depth of 20cm is the key depth. The correlation coefficient (0.957) between soil moisture at the depth of 20cm and the average moisture of the root layer (0~50cm) is the highest (0.957) and this depth can be employed to track the fluctuation of soil moisture in the tillage layer. The soil moisture in the root layer were inversed based on the trend of the real-time data of soil moisture in a single soil layer and this method significantly improved the correlation coefficient (0.963) between soil moisture at the depth of 30cm and that of the root layer. In addition, the inversion algorithm of soil moisture in the root layer was obtained based on the water balance principle. Results show that the high water content below 30cm depth, with little variability, cannot be used to capture the variation of soil moisture in the root layer. 【Conclusion】Considering the principle of avoiding the disturbance depth of farming machinery, the reasonable monitoring depth of soil moisture is recommended to be between 28 and 30 cm. |
| Key words: Volumetric soil water content; soil moisture monitoring; water content inversion; trends; reasonable depth |
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