不同矿化度咸水在滨海典型植被盐碱地中的入渗特性研究

基于滨海盐碱区典型植被白茅、盐地碱蓬和裸地的土壤性状调查,开展了不同矿化度咸水(0、5、10 g/L)在上述典型地块中的水分入渗试验,以分析滨海盐碱区典型植被对土壤结构特征、咸水入渗特性、水盐分布规律的影响.结果表明:①裸地、盐地碱蓬地和白茅地土壤容重和含盐量依次降低、土壤大粒径水稳性团聚体含量依次增加;②同一地块初始...

Infiltration Characteristics of Saline Water with Different Salinity in Coastal Saline-alkali Land with Typical Vegetation

Based on the investigation of soil properties of coastal saline-alkali land with typical vegetations, including bare land, Suaeda salsa and Imperata cylindrica, the infiltration experiments were conducted with saline water of different salinity (0, 5, 10 g/L) to evaluate the effects of the typical vegetations on the characteristics of soil structure, saline water infiltration and soil water and salt distribution. The results showed that: 1) Soil bulk density and salinity were in the order of bare land > Suaeda salsa land> Imperata cylindrical land, while water stable macro-aggregates contents were on the contrary. 2) In the same plot, the initial infiltration rate, stable infiltration rate and cumulative infiltration increased with the increase of water salinity, while the above infiltration parameters of the saline water with the same salinity were in the order of bare land < Suaeda salsa land< Imperata cylindrical land. 3)Before infiltration, the salt contents in topsoil were in the order of bare land < Suaeda salsa land<Imperata cylindrical land; after infiltration, the salt content in topsoil of bare land increased with the increase of salinity, significant salt leaching effect was observed after saline water infiltered into the soil of Suaeda salsa, and the best leaching effect was obtained after salinity of 5 g/L salt water infiltration; while water salinity influenced salt leaching insensitively in the soil of Imperata cylindrica. 4) The results of two-factor ANOVA showed that the vegetation type had more influence on the infiltration characteristics than the water salinity.