天津滨海园林绿化中盐土治理的理论及工艺

The theory and techniques about the improvement of saline soil in Tianjin seashore region under landscape greening.

在季风气候的影响下 ,天津滨海地区土壤剖面上盐分的运动具有周期性 ,而且在园林绿化建设中可以有目的地选择耐盐植物 .该文根据“临界深度”理论提出了用来指导该地区在园林绿化建设时治理盐土的“允许积盐”概念 ,其基本含义是如果积盐阶段并没有使植物根系活动层的盐分增加到马上危害植物的程度 ,即为随后的脱盐过程所消除 ,那么这种积盐是可以允许发生的 .相对应地 ,在确定排盐系统的埋深时 ,存在一个“允许深度” .天津开发区具有土壤基质软、潜水埋深浅、海水容易回浸等特殊水文地质条件 ,盐土的治理只能选择“允许深度”作为铺设排盐管的指导依据 ,并与开发区城市园林绿化建设相适应 ,建立了“浅密式”

Based on those facts: ①driven by the monsoonal climate, soil salt movement along profile reveals periodicity;②while constructing landscape and greening, people could choose salt enduring plants on purpose, the concept of “permitting accumulation of salt' for control salt harm on plants was proposed, showing that slight accumulation of salt in soil which would be erased in following desalting was permitted unless such accumulation would do harm to plants immediately. Accordingly, the concept of “permitting depth' was carried out for directing burying salt drainage system. In Tianjin Economy and Technology Development Area, the base of ground was soft, the underground water is shallow, and the seawater is easily immersed in, the salt drainage system could only be buried according to “permitting depth', resulting in the distance between drainage pipes became shortened, and forming \!shallow\|dense salt drainage system'.