土地利用方式及土壤理化性质对有效态锌累积的影响

利用土壤定位采样分析了富阳市不同土地利用方式和土壤特征对全量和有效态Zn在土壤中累积的影响.分析结果表明,工业用地与农业用地中的全量和有效态Zn差异极显著,工业用地方式土壤全量和有效态Zn含量较高;在农用地方式中,菜地、旱地、水田和林地的全量Zn累积程度相近,但与果园和茶园差异显著;不同农业用地中的有效态Zn无显著差异.并对农业与工业用地方式下全量Zn、土壤特征与有效态Zn含量之间的相关关系进行了分析.结果表明,在农业用地中,全氮、有机质和pH对Zn全量影响显著,而全量、有效磷和速效钾对Zn有效态影响显著;在工业用地中,土壤理化性质对全量和有效态Zn含量无明显影响,有效态Zn含量只与全量Zn含量显著相关.基于Zn有效态的指示Kriging评价结果显示,富阳市有5.56%的土地和5.99%的耕地处在较高的Zn污染风险水平(>0.100).

Influence of Land Use and Soil Properties on the Available Zn Concentration in Soils

The effects of land use and soil properties on the concentrations of total and available Zn in soils were investigated.The ANOVA analysis showed that land use had a significant effect on the concentrations of total and available Zn in agricultural and industrial areas;the concentration of total Zn in vegetable land,dry land,paddy field,and wood land had significant differences except tea garden and orchard;and the content of available Zn in the 6 agricultural land use types did not show significant differences.Moreover,the relationships between the Zn content and soil properties were respectively constructed for agricultural and industrial land use.Results showed that total nitrogen,organic matter and pH had significant influences on the total Zn content.Available phosphorus,available potassium,and the total Zn content had significant effects on the concentration of available Zn in agricultural area.Soil properties did not have significant influences on both the total and available Zn contents in industrial area,and the available content only had strong correlation with the total content.Risk assessment of available Zn using indicator Kriging demonstrated that most of the study areas were in low risk probability for arable activities,and 5.56% of the study areas and 5.99% of the arable land were in high risk probability(>0.100).