Abstract:

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.

Key words: residential district, industrial zone, green land, soil quality, comprehensive evaluation