天津经济技术开发区绿地土壤盐分动态变化特征

The Dynamic Changes of Soil Salt Distribution in Green Space of TEDA

【目的】掌握天津经济技术开发区土壤盐分的动态变化及分布情况,保证城市绿地的可持续性。【方法】通过长期定位监测,分析了研究区2007―2014年的土壤含盐量及pH值。【结果】研究区土壤含盐量整体上均呈逐年降低趋势,截至2014年3月研究区0~80 cm各层次土壤含盐量均在0.11%~0.14%之间,已经达到了滨海地区绿化种植土壤标准对土壤含盐量要求;土壤pH值整体随时间呈波动减小趋势,土壤pH值整体下降了0.33;研究区绿地土壤含盐量分布不均,但随着时间变化,研究区土壤总体的盐分水平分布的均一性有所提高,研究区土壤pH值分布较为均一。【结论】"暗管排盐"措施对天津经济技术开发区的绿地土壤盐分调控效果良好,但仍要加强对绿地土壤水盐动态的监测,减少土壤次生盐渍化的发生。

【Objective】The purpose of this paper is to grasp the dynamic changes and distribution of soil salinity in Tianjin Economic-Technological Development Area and ensure the sustainability of urban green space.【Method】The soil salinity and pH data which from 2007 to 2014 were analyzed through long-term located monitoring.【Result】The results showed that the general soil salinity in each layer showed the same decreasing trend year by year.By the time of March 2014,the soil salinity of all the soil layers in 0~80 cm range was decreased to 0.11%~0.14%,which had reached the requirement of green planting soil standard in coastal area to the soil salinity.Soil pH showed a fluctuated decreasing trend with the change of years and it decreased by 0.33 as a whole.The horizontal distribution of soil salinity in green space in the study area was uneven,the homogeneity of horizontal soil salinity distribution was improved with the time passing.The horizontal distribution of soil pH had better homogeneity.【Conclusion】The subsurface drain pipe technique had good effects on the regulation and control of soil salt in green space in Tianjin Economic-Technological Development Area,but it is still necessary to strengthen the monitoring of soil-water dynamics in green space and reduce the occurrence of soil secondary salinization.