Salt Accumulation during Cropping Season in an Arid Irrigation Area with Shallow Water Table Depth: A 10-Year Regional Monitoring
Salt Accumulation during Cropping Season in an Arid Irrigation Area with Shallow Water Table Depth: A 10-Year Regional Monitoring
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浅水位干旱灌区农作季节盐积累：10年区域监测
DOI：
10.3390/w14101664
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发表时间：
2022-05
期刊：
影响因子：
3.4
通讯作者：
Peijin Wu
中科院分区：
文献类型：
--
作者：
Chaozi Wang;Yuanyuan Luo;Zailin Huo;Zhongyi Liu;Geng Liu;Shuai Wang;Yifan Lin;Peijin Wu
目前，灌溉用水约占全球农业用水的35%，灌溉引起的土壤次生盐渍化影响着全球干旱灌区的作物生产和可持续发展。但作物生长期根区盐分积累规律及其各属性因子的贡献尚不清楚。为此，在河套灌区进行了连续10年的土壤盐分监测，以揭示作物生长季土壤盐分积累规律，并分析了作物潜在蒸散量、灌水量（田间灌水+降水）和地下水位埋深等因素对土壤盐分积累的影响。结果表明，在10 a的气候条件和节水灌溉措施下，（1）秋灌能有效地淋洗作物生长期积累的盐分，使根区土壤保持适宜作物萌发的状态，（2）作物生长季水分亏缺（潜在作物蒸散量-田间灌溉量-降水量）与作物季盐积累量有很强的相关性，（3）保持作物季平均地下水位深度大于临界深度（约3 m）可能是缓解盐分积累的最经济途径。因此，建议在今后的节水灌溉管理实践中，应兼顾盐分淋溶和地下水位控制。
Nowadays, irrigation takes up about 35% of agricultural water consumption worldwide, and irrigation induced secondary soil salinizationsalinization affects the crop production and sustainable development of arid irrigation areas globally. However, the regular pattern of salt accumulation in the root zone during the cropping season and the contributions of its attribute factors are still unclear. Therefore, a 10-year monitoring was conducted in the Hetao Irrigation District to reveal the soil salt accumulation during the cropping season and to relate it to influential factors, including potential crop evapotranspiration, water input (field irrigation + precipitation) and water table depth. It was found that under the climate conditions and water-saving irrigation measures of the investigated 10-year period, (1) the salt accumulated during the cropping season could be effectively leached by autumn irrigation and the root zone soil could remain suitable for crop germination, (2) the cropping season water deficit (potential crop evapotranspiration − field irrigation − precipitation) showed strong correlation with the cropping season salt accumulation, and (3) maintaining the cropping season average water table depth larger than a critical depth (roughly 3 m) might be the most economical way to alleviate salt accumulation. Therefore, it is recommended to balance the salt leaching and the water table depth controlling in the future water-saving irrigation management practices.
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