重庆市渝中区市街绿地土壤养分含量分析

目的]了解重庆市园林土壤的质量状况。方法]分析重庆市渝中区道路绿地、街旁绿地的土壤理化性质,按重庆市园林栽植土壤质量标准对其进行综合质量评价。结果]重庆市街绿地土壤pH值在6.2~8.5,73.4%的土壤呈碱性,53.2%的土壤已出现盐渍化趋势或已经发生盐害。重庆市街绿地土壤容重在0.84~1.77 mg/m3,个别地区的土壤容重过高。渝中区园林土壤中混有大量碎石、瓦块、水泥等建筑废弃物,使其保水保肥能力较差。重庆市街园林土壤碳酸盐含量平均值为(17.3±17.1)g/kg,是自然土壤的3倍多。结论]重庆市渝中区市街绿地土壤总体质量不高,一级土占总数的10.4%,二级土占总数的39.6%,三级土占总数的50.0%。

Analysis of Physical and Chemical Properties of Landscape Soil in Yuzhong District of Chongqing City

Objective] The aim was to understand the quality status of landscape soil in Chongqing city.Method] The soil physical and chemical properties of road greenbelt and street greenbelt in Yuzhong district of Chongqing city were analyzed and the comprehensive quality evaluation was made according to the planting soil quality standard of Chongqing landscape.Result] The soil pH value in street greenbelt of Chongqing city was between 6.2 and 8.5,73.4% soil was alkaline and 53.2% soil showed the salinization or had occurred salt injury.The soil bulk density in street greenbelt of Chongqing city was between 0.84 mg/m3 and 1.77 mg/m3 and that in several areas was too high.There had building waste such as a great deal of detritus,tile and cement mixed in landscape soil of Yuzhong district,which made the water and fertilizer retaining capacity poorer.The average carbonate content in landscape soil of Chongqing city was(17.3±17.1)g/kg,which was 3 times more than that in natural soil.Conclusion] The general quality in soil of street greenbelt in Yuzhong district of Chongqing city was not high,the gradeⅠ soil accounted for 10.4% of the total,the gradeⅡ soil 39.6% and the gradeⅢ soil 50.0%.