天津滨海重盐碱地区行道树土壤化学性质研究

Soil Chemical Properties of Street Trees in Coastal Heavy Saline-alkali Area of Tianjin

为了解不同树种下土壤盐碱变化的规律,对天津滨海重盐碱地区行道树土壤化学性质进行了调查和研究。结果表明,天津滨海重盐碱地区土壤pH(H2O)变动在7.92~8.33,不同土层土壤速效磷变动在12.64~75.01mg/kg;有机质含量最高值为2.35%,最低值为0.57%;不同树种间土壤八大离子含量差异显著,说明树种和土壤之间存在互作关系;通过对比1998—2011年土壤全盐及pH(H2O)指标发现,行道树下绿地土壤的全盐含量及pH(H2O)总体呈下降趋势。土壤全盐含量从1998年的2.79%下降到2011年的1.07%,而pH(H2O)则从1998年的8.43下降到2011年的8.08。这说明在"浅密式"暗管排盐工艺以及20多年的雨水、灌溉等多重因素的作用下,天津滨海重盐碱土壤的全盐及pH(H2O)得到了长期有效的控制。

The chemical properties of roadside tree soil in Tianjin coastal area were studied.The results showed that the change of soil pH(H2O)value was between 7.92~8.33,and the change of available phosphorus was between12.64-75.0 mg/kg in different soil layers;the highest organic matter content was 2.35%,and the lowest was 0.57%;there were significant differences in the content of eight ions between different tree species,which indicated that there was interaction between tree species and soil.In the past 14 years,the total salt content and pH(H2O)of the green soil under the roadside trees showed a general downward trend.The total salt content of soil decreased from2.79%to 1.07%,while the pH(H2O)decreased from 8.43 to 8.08.This showed that the total salt and pH(H2 O)of coastal heavy salt alkaline soil had been effectively controlled for a long time under the influence of"shallow dense"concealed pipe salt drainage process.