| 干旱区盐碱地滴灌土壤基质势对土壤盐分分布的影 |
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| 引用本文： | 焦艳平, 康跃虎, 万书勤, 孙泽强, 刘 伟, 董 锋. 干旱区盐碱地滴灌土壤基质势对土壤盐分分布的影[J]. 农业工程学报, 2008, 24(6): 53-58. |
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| 作者姓名： | 焦艳平 康跃虎 万书勤 孙泽强 刘 伟 董 锋 |
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| 作者单位： | 1.中国科学院地理科学与资源研究所 陆地水循环及地表过程重点实验室，北京 100101;2.中国科学院研究生院，北京 100049;3.宁夏回族自治区农业综合开发办公室，银川 750000 |
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| 基金项目： | 中国科学院知识创新工程项目 , 宁夏回族自治区农业综合开发领导小组办公室委托项目 , 天津市科技发展基金 |
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| 摘 要： | 该文通过田间试验研究覆膜滴灌条件下土壤基质势对土壤盐分分布的影响。试验设3个水平的土壤基质势处理： -5 kPa (S1)，-15 kPa (S2) 和-25 kPa (S3)，每个处理重复3次，按随机区组布置。试验结果表明：垄作覆膜滴灌条件下各盐分离子的迁移和分布特性不同。Na+ 和Cl- 易被灌溉水淋洗，主要分布在湿润体的边缘，在滴头附近含量最低，远离滴头含量逐渐增大，土壤基质势越高，淋洗效果越明显，离子含量和土壤总盐量呈线性相关。Mg2+、Ca2+、HCO3-含量受土壤基质势影响较小，在土壤剖面分布相对均匀，离子含量和土壤总盐量之间没有明显相关关系。盐渍化土壤中总盐分的淋洗主要受到作物播种时第一次大水量灌溉和苗期阶段较高土壤基质势控制的灌溉影响，作物生育中后期不同土壤基质势处理对土壤总盐分的淋洗影响较小。该研究结果对盐碱地水盐调控和灌溉制度的制定具有理论意义和应用价值。
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| 关 键 词： | 盐碱地 滴灌 土壤基质势 盐分分布 |
| 收稿时间： | 2007-04-18 |
| 修稿时间： | 2008-01-16 |
Effect of soil matric potential on the distribution of soil salt under drip irrigation on saline and alkaline land in arid regions |
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| Effect of soil matric potential on the distribution of soil salt under drip irrigation on saline and alkaline land in arid regions[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2008, 24(6): 53-58. |
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| Authors: | Jiao Yanping Kang Yuehu Wan Shuqin Sun Zeqiang Liu Wei Dong Feng |
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| Abstract: | Field experiment was conducted to investigate the effect of soil matric potential on the distribution of soil salt under ridge-mulch drip irrigation on saline and alkaline land in arid regions. The experiment included three treatments, in which controlled the soil matric potential higher than -5 kPa (S1), -15 kPa (S2) and -25 kPa (S3), respectively, at 20 cm depth immediately under emitter. All treatments were repeated three times with the experimental plots following a complete randomized block design. Results show that the different salt ions have the different characteristics of transport and distribution under mulch drip irrigation. Na+ and Cl- concentration easily leached by irrigation water is the lowest near the emitter and have an increasing trend of concentration far away from emitter. The leaching of Na+ and Cl- is increasing with the increase of soil matric potential. There are linear relations of total dissolved solids to the concentration of Na+ and Cl- in the experiment area, respectively. Mg2+, Ca2+ and HCO3- content are less influenced by soil matric potential, which have not obvious correlation with total dissolved solids and have relatively uniform distributions in the soil profile. The leaching of total dissolved solids mainly appears in the periods of the first drip irrigation with large amount of water on the same day after seeding and the later irrigation with high soil matric potential at seedling stage. There are less effects of irrigation water on the leaching of total dissolved solids at the latter stages of crop growth. The research results have a theory and application value for the water and salt regulation in soil and irrigation scheduling on saline and alkaline land. |
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| Keywords: | saline and alkaline land drip irrigation soil matric potential soil salt distribution |
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