天津滨海园林绿化中土壤盐分的演变规律

Soil salt evolvement regulations of seashore soil in Tianjin under landscape greening.

在天津经济技术开发区 ,依据“允许深度”建立“浅密式”排盐设施并配以相应的管理后 ,连续 10a的观测数据表明 :土壤盐分的空间分布符合正态分布 ;1m土体内不同土层的含盐量及 1m土体的总含盐量随治理时间的延长按照指数规律平稳地减少 ,盐分的表聚性逐渐减弱 ,土壤盐分的空间变异性变小 ;同时 ,土壤盐分的主组成分由NaCl向Na2 SO4 转变 .土壤盐分的演变规律表明 :通过“浅密式”排盐系统 ,可在不到 5a的时间内 ,便在 97.5 %置信度的保证下 ,将开发区土壤的含盐量控制在 0 .2 %以下 。

In Tianjin Economy and Technology Development Area, after \!shallow dense salt drainage system' was established according to \!permitting depth', continual observation over 10 years showed:① the distribution of soil salt fitted in with logarithm norm distribution or norm distribution; ②the soil salt content in 1 meter soil body and in various soil layers in 1m soil body exponentially decreased with time increasing, the spatial variability of soil salt dropped, and the supergene enrichment of soil salt erased little by little; ③the main composition of soil salt transferred from NaCl to Na\-2SO\-4. With these evolution regulations, it could be easily figured out that if \!shallow\|dense salt drainage system' keep running correctly, in this area, the soil salt content could be controlled below 0.2% with 97.5% probability within 5 years, and make plants free from salt harm.