天津市中心城区周边绿地土壤质量综合评价

Comprehensive Evaluation on Soil Quality in the Green Land Around the Central Area of Tianjin

通过野外调查与室内分析,研究天津市中心城区周边绿地表层土壤现状,利用改进内梅罗指数法综合评价绿地土壤质量。结果表明,天津市环城四区绿地土壤pH在6.5~8.5的占84.71%,属碱性土;0~20 cm土壤中全钾、全磷、速效钾等含量充足,能够满足植物生长需要;土壤中有机质含量大部分小于12.000 g/kg,含量很低;电导率>1.000 mS/cm占比达10.22%,土壤盐分含量较高,不利于植物生长;天津市环城四区绿地总体肥力属中等,主要表现在有机质积累不足,全氮、碱解氮、有效磷等营养成分不足。

Through field investigation and indoor analysis,the status of the surface soil of the green land around the central area of Tianjin was studied,and the improved Nemero index method was used to comprehensively evaluate the soil quality of the green land.The results showed that 84.71%of the green soils pH in the four districts around the city in Tianjin was 6.5-8.5,which belonged to alkaline soils.The content of total potassium,total phosphorus,and available potassium in 0-20 cm soil was sufficient to meet the needs of plant growth.The organic matter content in the soil was mostly less than 12.000 g/kg,which was very low.The electrical conductivity>1.000 mS/cm accounted for 10.22%,and the soil salt content was high,which was not conducive to plant growth.The overall fertility of the green land in the four districts around the city of Tianjin was medium,which was mainly manifested in the insufficient accumulation of organic matter and insufficient nutrients such as total nitrogen,alkali-hydrolyzable nitrogen and available phosphorus.