不同灌排条件下盐渍土冻融期水热盐迁移速率研究OA
Combined effects of irrigation and drainage on water,heat and salt dynamics in saline soils during the freezing-thawing period
[目的]探究宁夏银北灌区冻融期灌排协同措施对盐渍土水热盐迁移速率的影响.[方法]基于室内土柱模拟试验,设置不同冬灌定额(W1:900 m3/hm2、W2:1 350 m3/hm2、W3:2 400 m3/hm2)与排水条件(D1:有排水、D2:无排水),明确冻融期盐渍土水热盐迁移速率对不同灌排条件的响应.[结果]在冻融期,冬灌定额对各土层的土壤水热盐迁移速率影响显著,其影响程度排序为冬灌定额＞灌排协同＞排水措施;其中,W2处理下的0～5 cm土层土壤温度变化速率最大,15～70 cm土层温度变化速率最小,水盐迁移速率最大;不同处理15、25 cm土层深度的水热盐迁移速率具有较强相关性(相关系数介于0.63～0.99).排水措施条件下,土壤水盐的向下迁移速率明显增加.W2D1处理冻融期土壤剖面温度变化迟滞效应最强,水盐迁移速率最大,灌排协同效应最显著.[结论]当冬灌定额为1 350 m3/hm2且有排水措施时,冻融期水热盐迁移速率的调控效果最优,可为宁夏银北灌区盐碱地高效利用提供理论依据和数据支撑.
[Objective]Saline-alkali soils are widely distributed in the Yinbei Irrigation District of Ningxia,and coordinated irrigation and drainage management is critical to preventing secondary salinization in this region.This paper investigates the combined effects of irrigation and drainage on soil water,heat,and salt dynamics during the freezing-thawing period,with the aim to find a practical strategy to improve efficient utilization of these soils.[Method]The experiment was conducted using soil columns packed with salinized soil to represent a winter irrigation.It consisted of three irrigation treatments:900 m3/hm2(W1),1 350 m3/hm2(W2),and 2 400 m3/hm2(W3),and two drainage treatments:with drainage(D1)and without drainage(D2).During the experiment,spatiotemporal variations in soil water,heat,and salt were measured in all treatments during a freezing-thawing period.[Result]Irrigation played the dominant role in influencing water and salt migration,as well as heat transfer throughout the soil profile in all treatments.In particular,W2 treatment resulted in the largest variation in water,heat,and salt in the 5 cm soil layer compared to that in the 15-70 cm soil layers.Water,heat,and salt migration were strongly correlated in the 15-25 cm soil layers in all treatments,with correlation coefficients ranging from 0.63 to 0.99.Drainage significantly enhanced the downward migration of soil water and salt.Overall,the temperature variation in the W2D1 treatment showed a hysteresis effect within the soil profile;water and salt migrated deeper in this treatment than in others,demonstrating a strong synergistic effect of irrigation and drainage on soil water and salt movement.[Conclusion]A winter irrigation amount of 1 350 m3/hm2 combined with a drainage can optimally regulate the migration of water,salt,and heat during the freezing-thawing period in saline soil profile.These findings provide practical guidance for efficient utilization of saline soil and mitigating secondary salinization in the Yinbei Irrigation District.
吕航;李旭;李王成;贾振江;吴洋洋;安文举;黄亚浩;马东祥
宁夏大学土木与水利工程学院,银川 750021宁夏大学土木与水利工程学院,银川 750021宁夏大学土木与水利工程学院,银川 750021||旱区现代农业水资源高效利用教育部工程研究中心,银川 750021||宁夏回族自治区黄河水联网数字治水重点实验室,银川 750021宁夏大学土木与水利工程学院,银川 750021宁夏大学土木与水利工程学院,银川 750021宁夏大学土木与水利工程学院,银川 750021宁夏大学土木与水利工程学院,银川 750021宁夏大学土木与水利工程学院,银川 750021
农业科技
银北灌区灌排协同盐渍土冻融期水热盐迁移
Yinbei irrigation districtcoordination of irrigation and drainagesaline soilfreezing-thawing periodwater-heat-salt migration
《灌溉排水学报》 2026 (5)
67-78,12
国家重点研发计划项目(2021YFD1900601)宁夏高等学校一流学科建设项目(NXYLXK2021A03)宁夏大学研究生创新项目(CXXM2024-30)国家自然科学基金项目(52169010)宁夏自然科学基金重点项目(2021AAC02008)
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