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| 不同地下水埋深冬灌淋洗排盐特征及数值模拟 |
| Characteristics and numerical simulation of irrigation leaching and salt discharge in winter with different groundwater depth |
| 投稿时间：2024-09-11 |
| DOI：10.13254/j.jare.2024.0720 |
| 中文关键词: 脱盐率，排盐量，冬灌，地下水埋深，HYDRUS-2D |
| 英文关键词: desalination rate, salt discharge, winter irrigation, groundwater depth, HYDRUS-2D |
| 基金项目:国家重点研发计划项目（2021YFD1900805）;新疆维吾尔自治区自然基金项目（2024D01A98）;“天山英才”领军人才项目（2022TSYCLJ0069） |
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| 中文摘要: |
| 为探究盐渍化土壤不同地下水埋深条件下冬灌淋洗盐分的分布特征及排盐规律，本研究于2022—2023年针对南疆库尔勒轻中度盐渍化土壤开展不同地下水埋深冬灌淋洗试验。地下水埋深设置为2.0 m与3.0 m，冬灌淋洗为隔年冬灌与连续冬灌，并建立HYDRUS-2D水盐运动模拟模型，分析了盐渍化土壤不同地下水埋深及冬灌淋洗条件下排盐特征及适宜淋洗定额。结果表明，不同地下水埋深下连续冬灌土壤0~60 cm土层平均脱盐率显著高于隔年冬灌处理（P<0.05），地下水埋深与冬灌淋洗排盐量呈负相关，不同冬灌模式下地下水埋深2.0 m处理比地下水埋深3.0 m的处理累积排盐量增长1.5~2.0倍。所建立的HYDRUS-2D水盐运动模拟模型的排水排盐量决定系数为0.914~0.987，土壤实测值与模拟值具有很好的一致性。模拟结果表明不同地下水埋深条件下单方水脱盐率随着灌水量的增加逐渐增加，地下水埋深越深对次年春播前根际层土壤盐分影响越小。研究表明，中度盐渍化土壤地下水埋深1.5 m以下及冬灌水量270 mm较为适合。 |
| 英文摘要: |
| In order to explore the distribution characteristic of winter irrigation leaching salt and the law of salt discharge under different groundwater depths in saline soil, winter irrigation leaching experiments with different groundwater depths were carried out in Korla, southern Xinjiang, from 2022 to 2023. The groundwater depths were set at 2.0 m and 3.0 m, and the winter irrigation was the alternate year winter irrigation and continuous use of winter irrigation. The HYDRUS-2D water salt movement simulation model was established, and the salt discharge characteristics and appropriate leaching quota under different groundwater depths and winter irrigation leaching conditions in saline soil were analyzed. The results showed that the average desalination rate of 0~60cm soil layer under continuous use of winter irrigation with different groundwater depths was significantly higher than that of the alternate year winter irrigation（P<0.05）, and the groundwater depth was negatively correlated with the leaching salt discharge of winter irrigation. The cumulative salt discharge of the treatment with groundwater depth of 2.0 m was 1.5~2.0 times higher than that of the treatment with groundwater depth of 3.0 m under different winter irrigation. The determination coefficient of drainage and salt discharge of the HYDRUS-2D water salt movement simulation model was 0.914~0.987, and the measured value of soil is in good agreement with the simulated value; the soil desalination rate per cubic meter of water gradually increased with the increase of irrigation amount under different groundwater levels, and the deeper the groundwater depth, the smaller the impact on the soil salt in the rhizosphere layer before the next spring sowing. It was more suitable for moderately salinized soil with groundwater depth less than 1.5 m and winter irrigation quota of 270 mm. The research results provided references for the formulation of groundwater table burial depth and winter irrigation leaching scheme under different salinization conditions in northwest arid area in China. |
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