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| DOI：10.13522/j.cnki.ggps.20190088 |
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| Effect of underlying water-blocking plate width on soil moisture movement under subsurface drip irrigation |
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SUN Hao HUANG Xiuqiao, HAN Qibiao, LI Hao, CHEN Zhen, SUN Xiulu
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1.Farmland Irrigation Research Institute, The Chinese Academy of Agricultural Sciences, Xinxiang 453002, China；2. Key Laboratory of Water-saving Agriculture of Henan Province, Xinxiang 453002, China
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| Abstract: |
| 【Objective】This study is to improve the water supply capacity of deep buried subsurface drip irrigation in the early stage of crop growth, and reduce the risk of deep percolation.【Method】In this paper, the soil-bin tested under point-source subsurface drip irrigation with three experiment treatments,which were underlying water-blocking plate with 7.8 cm width and 9.4 cm width, and without water-blocking plate. It was to determine the effect of underlying water-blocking plate width on the movement of soil wetting front and soil moisture distribution.【Result】The underlying water-blocking plate did not affect the shape of soil wetting front, which was still similar to the flat oval, but it changed the soil wetting pattern. The underlying water-blocking plate had little effect on the horizontal migration distance, but it obviously increased the vertical upward migration distance and reduced the vertical downward migration distance of soil moisture, making the wetted soil volume migrate to the upper layer of soil as a whole, and the wider the water-blocking plate, the more obvious the migration of the wetted soil volume. Meanwhile, the underlying water-blocking plate can adjust the soil moisture distribution in the wetted soil volume. When the underlying water-blocking plate was broadening, the soil moisture content of the shallow soil (0~10 cm) increased, while it was reduced in the deep soil (50~60 cm).【Conclusion】The underlying water-blocking plate can promote the wetted soil volume and soil moisture to concentrating on the upper layer of soil under subsurface drip irrigation, which is beneficial to ensure the water supply in the early stage of crop growth. |
| Key words: subsurface drip irrigation; water-blocking plate; soil wetting front; soil water distribution |
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