张家川乌龙头种植地土壤肥力与环境质量评价

Wulongtou Planting Soil Fertility and Environmental Quality Assessment in Zhangjiachuan County

通过对张家川典型乌龙头种植地中肥力指标及环境质量指标的测定,采用综合指数法、单因子指数法和内梅罗指数法对土壤肥力和土壤环境质量进行评价。结果表明:张家川县土壤pH值偏高,均值为8.15,为碱性土壤;有机质含量偏低,均值为16.6g/kg,全氮含量适中,但有效氮含量较低,均值为37.25mg/kg;速效磷含量较丰富,速效钾含量丰富。土壤肥力综合指数为0.61,属中等水平,需要添加土壤改良剂、有机肥等措施促进乌龙头生长发育及产量提高。土壤环境质量等级为1级,污染水平为清洁,但重金属含量均高于背景值,出现累积效应。

Through determination of typical Wulongtou planting soil fertility and environmental quality indices in the Zhangjiachuan County,using synthetic index method,single-factor index method and Nemerow index method have carried out soil fertility and environmental quality assessment.The result has shown that soil pH value is on high side,mean value 8.15,belongs to alkali soil;organic matter content on low side,mean value 16.6g/kg;total nitrogen content medium,but available nitrogen content lower,mean value 37.25mg/kg;available phosphorus content rich;available potassium rich.Soil fertility synthetic index is 0.61,belongs to medium level,soil conditioner and organic fertilizer adding etc measures are needed to boost Wulongtou growing output.Soil environmental quality belongs to category I,class of pollution cleanliness,but heavy metal contents are all higher than background value with cumulative effects.