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以湘中地区的耕型第四纪红土红壤进行不同稻作制度长期定位试验，研究旱改水及不同稻作制对土壤铜的化学行为及有效性的影响。结果表明，红壤旱地改水田１０年后，土壤对铜的吸附能力显著增强，土壤有效铜含量也明显提高。三种稻作制比较，稻稻冬泡土壤对铜的吸附能力和土壤有效铜含量明显高于稻稻冬绿和稻稻冬油土壤。供试土壤铜主要以有机态铜、无定形铁态铜、晶形铁态铜和残留态铜四种形态存在。红壤旱土改水田后，有机态铜和无定形铁态铜明显增加，而晶形铁态铜和残留态铜则显著下降；稻稻冬泡土壤的有机态铜和无定形铁态铜明显高于稻稻冬绿和稻稻冬油土壤；无定形铁态铜和有机态铜与土壤有效铜呈极显著线性正相关，是供试土壤有效铜的主要来源。
The long-term positioning experiment of different paddy systems was carried out in the plowed Quaternary lateritic red soil in the middle part of Hunan Province to study the effects of drought-amended water and different rice-growing systems on the chemical behavior and availability of soil copper. The results showed that after 10 years of converting paddy red soil into red paddy soil, the adsorption capacity of copper to soil was significantly enhanced and the available copper content in soil increased significantly. Compared with the three rice systems, the adsorption capacity of winter wheat soils on paddy soil and the available copper content in soil were significantly higher than those in winter paddy rice and winter paddy soil. Soil copper for the test mainly organic copper, amorphous ferrous copper, crystalline ferrous copper and residual copper exist in four forms. After the paddy soils in the red soil were converted into paddy fields, the content of organic copper and amorphous ferric copper increased obviously, while the crystalline ferrous copper and residual copper decreased significantly. The contents of organic copper and amorphous ferric copper in winter soils were significantly higher than those of paddy soils Rice winter mung bean and rice winter oil soils. Amorphous iron-copper and organic copper showed significant linear positive correlation with soil available copper, which was the main source of available copper in soil.