湖北房县烟区土壤重金属含量状况及其与土壤肥力的关系

以湖北房县烟区186份植烟土壤样品为供试材料,研究了植烟土壤重金属含量与土壤肥力的关系。试验结果表明,(1)湖北房县烟区植烟土壤重金属含量状况符合无公害农产品产地环境条件的要求。(2)湖北房县烟区大部分植烟土壤养分变异系数较小,肥力较为均匀。(3)在一定范围内,pH值处于中性偏酸(6.0～7.0)时,土壤的重金属含量相对较低,当pH<6.0时,重金属含量较高;重金属含量与阳离子代换量(CEC)的关系明显,随着CEC值的增加,重金属含量增加;除As元素外,碱解氮的含量越高,重金属的含量越高;随着速效磷和速效钾含量的增加,重金属含量均增加;除重金属As变化不明显外,其他重金属含量均与有机质含量的关系明显,随着有机质含量的增加,重金属含量增加。

Relationship of the Contents of Main Factors of Soil Fertility and Soil Heavy Metal Content Status in Tobacco-growing Areas Fang County,Hubei

186 soil samples from Fang county Hubei tobacco-growing areas were taken as experimental material to study the relationship between tobacco heavy metal content and soil fertility.The results show that:(1) Most content of tobacco-growing areas heavy metals in Hubei Fang county conform the requirements of environmental conditions.(2) Most tobacco soil conditions consistent with high quality tobacco production and the content is suitable.(3) Within a certain range,when the pH was in neutral partial acid(6.0～7.0),the soil heavy metal content was relatively low and when the pH was below 6.0,the heavy metal content would be higher.Heavy metal content and CEC value relations were obvious.Along with the increase of CEC value,the heavy metal content increased.Except the As,when the Alkali-hydro nitrogen content is higher,the metals levels is higher.With the increase of the content of rapidly-available phosphorus,heavy metal content increased.With the increase of rapidly-available potassium content,heavy metal content increase.Except for heavy metal,As did not change significantly,other heavy metal content and organic matter content were obvious.With the increase of OM,heavy metal content increasd.