秸秆排水体埋深对盐渍土水盐分布的影响及排水抑盐效果
发布时间：2018-07-20 17:41
【摘要】：为探究秸秆排水体对盐渍土水盐运移的影响及其排水排盐效果,通过室内土柱试验,研究在淡水(CK)和微咸水灌水情况下秸秆排水体埋深为40和60 cm时供试土壤的水盐分布状况。结果表明,入渗阶段,湿润锋与入渗时间呈幂函数关系,累积入渗量与入渗时间则可采用Kostiakov模型进行拟合;蒸发阶段,秸秆排水体对埋设深度以下的土体具有明显的保水作用,40 cm埋深的处理在40~70 cm土层范围以及60 cm埋深的处理在50~70 cm土层范围土壤水分变化的相对变化量均0;秸秆排水体有利于保持灌水后土壤的脱盐状态,40 cm埋深处理和60 cm埋深处理比无埋设的对照处理分别减少了19.61%和15.68%的盐分变化量;秸秆体的排水排盐效果与灌水矿化度和秸秆排水体埋深密切相关,灌溉水矿化度适当的增加和秸秆体的埋设加深将有利于排水效果的提升,低灌溉水矿化度结合秸秆体深埋具有更好的排盐效果。该研究为微咸水灌溉及盐渍土的开发利用提供依据和参考。
[Abstract]:In order to explore the effect of the straw drainage body on the water and salt migration of saline soil and the effect of drainage and salt drainage, the distribution of water and salt in the tested soil under the condition of fresh water (CK) and brackish water irrigation under the conditions of fresh water (CK) and brackish water irrigation was studied. The results showed that the wetting front and the infiltration time had a power function relationship with the infiltration time, and the accumulation was accumulated. The infiltration amount and infiltration time can be fitted with the Kostiakov model. In the evaporation stage, the straw drainage body has obvious water conservation effect on the soil below the buried depth, and the relative change of soil moisture change in the range of 40~70 cm soil layer and 60 cm buried depth in the 40~70 cm soil layer is 0, and the straw drainage body is found. It is beneficial to maintain the desalination state of soil after irrigation. The 40 cm buried depth treatment and 60 cm buried depth treatment reduce the salinity of 19.61% and 15.68%, respectively, and the effect of drainage and salt drainage of straw body is closely related to the salinity of water and the buried depth of the straw drainage body, the increase of the salinity of the irrigation water and the burial of the straw body. Deepening will be beneficial to the improvement of drainage effect. Low irrigation water salinity and deep burial of straw have better effect on salt drainage. This study provides a basis and reference for the development and utilization of saline water irrigation and saline soil.
【作者单位】： 南方地区高效灌排与农业水土环境教育部重点实验室;河海大学水利水电学院;
【基金】：国家自然科学基金资助项目(51579069) 高等学校学科创新引智计划项目(B12032) 中央高校基本科研业务费(2015B42314)
【分类号】：S156.4
，
本文编号：2134264
[Abstract]:In order to explore the effect of the straw drainage body on the water and salt migration of saline soil and the effect of drainage and salt drainage, the distribution of water and salt in the tested soil under the condition of fresh water (CK) and brackish water irrigation under the conditions of fresh water (CK) and brackish water irrigation was studied. The results showed that the wetting front and the infiltration time had a power function relationship with the infiltration time, and the accumulation was accumulated. The infiltration amount and infiltration time can be fitted with the Kostiakov model. In the evaporation stage, the straw drainage body has obvious water conservation effect on the soil below the buried depth, and the relative change of soil moisture change in the range of 40~70 cm soil layer and 60 cm buried depth in the 40~70 cm soil layer is 0, and the straw drainage body is found. It is beneficial to maintain the desalination state of soil after irrigation. The 40 cm buried depth treatment and 60 cm buried depth treatment reduce the salinity of 19.61% and 15.68%, respectively, and the effect of drainage and salt drainage of straw body is closely related to the salinity of water and the buried depth of the straw drainage body, the increase of the salinity of the irrigation water and the burial of the straw body. Deepening will be beneficial to the improvement of drainage effect. Low irrigation water salinity and deep burial of straw have better effect on salt drainage. This study provides a basis and reference for the development and utilization of saline water irrigation and saline soil.
【作者单位】： 南方地区高效灌排与农业水土环境教育部重点实验室;河海大学水利水电学院;
【基金】：国家自然科学基金资助项目(51579069) 高等学校学科创新引智计划项目(B12032) 中央高校基本科研业务费(2015B42314)
【分类号】：S156.4
，
本文编号：2134264
本文链接：https://www.wllwen.com/kejilunwen/nykj/2134264.html
