铜尾矿库区狗牙根根际土壤铜的形态变化

通过野外调查和室内分析，对安徽省铜陵市铜尾矿库区狗牙根根际土壤Cu的形态进行了研究．结果表明，尾矿库区狗牙根根际与非根际土壤Cu大部分为矿物态Cu，交换态Cu含量偏低．与非根际土壤相比，狗牙根根际土壤pH值下降，有机质含量显著增加．随着狗牙根的生长，根际土壤有机结合态Cu和交换态Cu含量显著增加，其占土壤总Cu量的比例分别增加7．89％和超过5％，碳酸盐结合态Cu和铁锰氧化物结合态Cu含量则有所下降．狗牙根生长促进了根际土壤Cu形态的转化，提高了Cu在土壤中的迁移能力，加之狗牙根的吸收作用，其根际土壤Cu含量显著降低．

Transformation of Cu forms in Cynodon dactylon rhizosphere soil of copper tailings yard

The study on the Cu forms in Cynodon dactylon rhizosphere soil of copper tailings yard in Tongling City, Anhui Province showed that among the test Cu forms, the amount of residual form occupied the majority, while that of exchangeable form was relatively low. Compared with non-rhizosphere soil, rhizosphere soil had a higher organic matter content but a lower pH. With the growth of C. daetylon, the contents of organically combined and exchangeable Cu in rhizosphere soil increased by 7.89% and 5% , respectively, while those of carbonate-combined and Fe-Mn oxidescombined Cu decreased. The growth of C. daetylon accelerated the transformation of Cu forms in rhizosphere soil, and decreased the rhizosphere soil Cu content through its absorption.