| 引用本文: | 张雪萍,李娜,焦平金,等.井灌井排对农田水盐分布的影响规律[J].灌溉排水学报,0,():-. |
| ZHANG Xueping,li na,jiao pingjin,et al.井灌井排对农田水盐分布的影响规律[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 为控制土壤次生盐渍化对灌区农业可持续发展的影响，探讨了井灌井排控盐降渍效应及其对土壤水盐时空分布的影响。采用试验监测方法，对比了井灌井排、渠灌和井渠结合影响下的水盐时空变化，分析了单井控制范围内的水盐时空变化规律及其影响机制。结果发现，井灌井排与渠灌结合可使地下水埋深控制在合理范围并使土壤剖面水盐含量维持在适宜作物生长的范围。地下水埋深沿井位径向距离的增加而逐渐变浅，增加100m径向距离将减少0.35m的地下水降落；土壤剖面含盐量随径向距离的增加而增加，其累积量与地下水埋深呈弱相关关系。适当采用井灌井排可维持灌区的水盐平衡与农业可持续发展，而远井端浅水位埋深减少洗盐效果的积盐效应可采用减少井距来防控。 |
| 关键词: 井排；井灌；土壤盐分；井渠结合；渠灌；土壤水分 |
| DOI： |
| 分类号:S276；S156.4 |
| 基金项目:国家重点研发计划项目（2017YFC0403304） |
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| Field Distribution of Water and salinity under well drainage combined irrigation |
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ZHANG Xueping1, li na2, jiao pingjin1, CHI Bixuan1
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1.China Institute of Water Resources and Hydropower Research;2.China Irrigation and Drainage Development Center
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| Abstract: |
| To alleviate the effect of soil secondary salinization on agricultural sustainable development, we explored the temporal and spatial distribution of soil water and salinity and topsoil salt accumulation under well drainage combined irrigation. The basin experiment was conducted to address the temporal and spatial distribution of soil water and salinity under the well drainage combined irrigation, canal irrigation and combined groundwater and surface water irrigation; The field experiment was implemented to analysis the temporal and spatial distribution of soil water and salinity along well radial distance. The appropriate groundwater depth and soil water content and salinity were maintained by the combined groundwater and surface water irrigation. Groundwater depth decreased along well radial distance, and groundwater drawdown decreased by 0.35m with radial distance increase of 100m. Soil profile salinity increased along well radial distance, and accumulated soil salts showed a weak relationship with the groundwater depth. The well drainage combined irrigation has the potential to maintain the water and salinity balance and agricultural sustainable development, and reduced well spacing can attenuate salt accumulation because of salt leaching reduced by shallow groundwater depth away from well. |
| Key words: well drainage；well irrigation；soil salinity；combined groundwater and surface water irrigation；canal irrigation；soil water |
