| Cite this article: | 夏超凡,洪大林,和玉璞,等.干湿循环作用下稻田地下水补给过程变化特征[J].灌溉排水学报,0,():-. |
| Xia Chaofan,Hong Dalin,He Yupu,et al.干湿循环作用下稻田地下水补给过程变化特征[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Capillary Rise in Paddy Field under Dry-wet Alternation |
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Xia Chaofan, Hong Dalin, He Yupu, Ji Renjing, Rui Xuqian
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State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute
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| Abstract: |
| 【Objective】In order to investigate the characteristics and effect of capillary rise in the water-saving paddy fields, 【Method】the experiment was conducted by a lysimeter with fixed groundwater depth (0.5m). The characteristics of capillary rise in the controlled irrigation paddy fields were analyzed, the effects of capillary rise on rice evapotranspiration and soil moisture distribution were further evaluated by analyzing the experimental data. 【Result】The results showed that the capillary rise rates peaked within 1 day after irrigation and precipitation when the soil moisture dropped to lower levels during the dry-wet alternation. There were 16 capillary rise rate peaks in the rice season. The amount of capillary rise in the controlled irrigation paddy fields was 253.98mm, significantly increased by 244.65mm compared with flooding irrigation paddy fields (9.33mm). And about 51.1% of the rice evapotranspiration under controlled irrigation originated from the capillary rise. The effect of capillary rise on the soil moisture below 30cm depth was obvious. The soil moisture of below 30cm solum maintained constant because of groundwater contribution. The soil moisture of 0~30cm solum decreased during the dry-wet alternation. 【Conclusion】Controlled irrigation significantly increased capillary rise amounts in paddy field compared with flooding irrigation. The evapotranspiration of rice under controlled irrigation was effective supplied by shallow groundwater. The soil moisture of rice root zone also was impacted by capillary rise. The analysis of capillary rise processes in controlled irrigation paddy field will be useful for optimizing water management in paddy fields. |
| Key words: water-saving irrigation, paddy field, capillary rise;dry-wet alternation |
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