| 引用本文: | 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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| 摘要: |
| 【目的】为阐明节水灌溉模式稻田地下水补给特征及其影响，【方法】采用定地下水埋深的蒸渗仪开展试验，分析节水灌溉干湿循环下稻田地下水补给量变化过程，研究地下水补给对节水灌溉稻田作物需水的贡献及对土壤水分的调节作用。【结果】结果表明：控制灌溉稻田地下水补给过程频繁，当稻田干湿循环过程中土壤水分降至一定限度时，稻田地下水补给量在复水后（灌水或降雨）1天内出现峰值，稻季共出现16次峰值。控制灌溉稻田稻季地下水补给量达253.98mm，约占水稻需水量的51.1%。稻田干湿循环中，在稻田地下水补给与土壤水入渗的综合作用下，30cm深度以下土壤含水率保持稳定，0~30cm深度土壤含水率总体呈下降趋势。【结论】分析得出，节水灌溉干湿循环下稻田地下水补给量显著增加，有效补给了水稻需水。浅地下水埋深条件下，稻田地下水补给过程直接影响水稻根区土壤水分变化。 |
| 关键词: 节水灌溉;稻田;地下水补给; 干湿循环 |
| DOI： |
| 分类号:S274 |
| 基金项目:国家自然科学基金项目（51609141），南京水利科学研究院中央级公益性科研院所基本科研业务费专项资金项目（Y918004） |
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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 |
