欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
利用土柱模拟试验,设置淡水、咸水灌溉、咸水结冰和咸水结冰覆盖4个灌溉方式,研究咸水结冰灌溉条件下盐分运移及盐基离子Cl^-、SO4^2-、HCO^3-、Na^＋、Mg^2＋、K^＋和Ca^2＋的土层剖面迁移规律。结果表明：咸水直接浇灌使各土层土壤盐度提高,且盐分具有明显表层聚集特性,而咸水结冰后灌溉则显著降低表层0-40 cm土层的盐分盐度,配合秸秆覆盖措施则使表层的脱盐率进一步提高,特别是0-10 cm土层,土壤盐度仅为0.15 dS/m,与淡水处理尚未达显著性差异（P〉0.05）。咸水结冰灌溉显著改变盐基离子Cl^-、SO4^2-、HCO^3-、Na^＋、Mg^2＋、K^＋和Ca^2＋的土壤剖面分布特征,但不同离子的响应方式和影响程度存在差异。咸水结冰灌溉显著（P〈0.05）降低表层危害性较高的Na^＋、SO4^2-和Cl^-浓度,而对危害性较小的Mg2＋、K＋和Ca2＋则影响较小。咸水结冰灌溉可促进表层土壤的脱盐作用,淋洗主要危害性离子Na^＋、Cl^-等,保持土壤根系分布密集层较低盐分水平和盐基离子平衡,缓解或消除盐分和盐基离子对作物生长的危害,配合秸秆覆盖则效果更加明显。
英文摘要：
The control treatment（irrigation with fresh water,CK）,irrigation with saline water（SW）,irrigation with saline water ice（MI）,and irrigation with saline water ice and wheat straw mulch（MI＋SW） was conducted to study the mechanism of soil water,salt and ion movement using soil column modeling experiment based on the melting process.The results showed that compared to irrigation with fresh water,soil salinity was more under the saline water treatment with the salt aggregation in the surface.However,irrigation with saline water ice the salt content in 0-40 cm decreased significantly,with the value of 0.28 dS/m,while making wheat straw mulching the salt rejection rate improved,especially in the 0-10 cm depth,where the salinity was only 0.15 dS/m,and had no significant difference observed with fresh water treatment.Meanwhile,irrigation with saline water ice significantly affected the vertical distribution characteristic of ion concentration,such as Cl^-,SO4^2-,HCO3^-,Na^＋,Mg^2＋,K^＋ and Ca^2＋.Na^＋,SO4^2- and Cl^-significantly decreased in the surface layer,while influenced slightly for Mg2＋,K＋ and Ca^2＋.In conclusion,irrigation with saline water ice could improve the desalination in surface soil,keep ionic equilibrium,make the salinity value in root distribution layers remain low,which was useful to alleviate the salinity and ion hazards,while the effect was much more significant with straw mulch.
同期刊论文项目
同项目期刊论文
期刊信息
位置：