居住区和工业区绿地土壤质量综合评价研究

Comprehensive evaluation of soil quality of grassland in residential and industrial areas

以济南市居民区和工业区绿地为研究对象,选取与作物生长相关的10项理化性质作为评价指标,分别采用相关分析法与主成分分析法确定权重系数,并应用综合指数法对土壤质量进行定量评价。结果表明,居住区土壤质量整体要好于工业区,居住区中高级土壤所占比例分别比工业区高16.66%和12.10%。就居住区和工业区各指标的平均值而言,土壤容重呈一定的紧实趋势,属偏碱性土壤,EC值偏低,有机质含量相对也偏低,氮、磷含量属中等偏上水平,钾含量均相对丰富。相关性分析表明,有机质是重要的土壤质量评价因子,与全氮、全磷、碱解氮和速效钾的相关性均达到5%显著性水平。相关分析法和主成分分析法对土壤质量的评价结果较为一致,r2=0.967 1,进一步说明本研究采用的土壤质量评价方法科学可行,评价结果准确可靠。

We employed correlation analysis and principle component analysis to determine weight coefficients and comprehensive index method to quantitatively evaluate soil quality for the grassland in Jinan residential and industrial areas with 10 crop growth associated physical and chemical indexes.Results show that the soil quality of residential area is totally better than that of industrial area.Correlation analysis method indicates that an extra 16.66％ of medium and high level soil exists in residential area than in industrial area.The results indicated by principal component analysis method is 12.10％.Soil bulk density exhibits certain solid trend in terms of average indexes of residential and industrial areas.The soil of two areas are both alkali.EC content and soil organic matter content are both in comparatively low level.The content of nitrogen and phosphorus is medium or over medium level.The content of kalium of these two areas is all relatively rich.Correlation analysis indicates that organic matter is an important soil quality evaluation factor.Its correlation coefficients with total nitrogen,total phosphorus,available nitrogen and available kalium all reach significant level of 5％.Both analysis methods have a similar evaluation result（r2 =0.967 1）.This further shows that our soil quality comprehensive evaluation method is scientific and feasible,and that the evaluation results is accurate and reliable.