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Copper availability as related to soil copper fractions in oxisols under liming

机译：浸石灰下与土壤中铜含量相关的铜有效性

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The knowledge of the chemical forms of copper in soils and the relationships of these forms with soil copper availability are important for predicting the copper behavior in the soil-plant system. The present work studies the influence of liming on the available contents of copper as well as on the forms of copper fractions in six types of Oxisols. Soil samples, with and without liming, received copper at rates of 0.0, 20.0 and 40.0 mg dm-3 and remained incubated for 30 days. Then, available copper was extracted with Mehlich-1, Mehlich-3, DTPA and EDTA solutions, and analyzed by atomic absorption spectrophotometry. Additionally, soil samples were extracted in a sequential procedure to determine Cu in fractions of soil, as follows: exchangeable-Cu fraction, organic matter-Cu fraction, Mn oxide-Cu fraction, amorphous Fe oxide-Cu fraction, crystalline Fe oxide-Cu fraction, residual-Cu fraction, and the total Cu content in the soil. Soil samples to which Cu was added presented higher Cu retention in the organic matter fraction with a small percentage retained in the exchangeable-Cu fraction. Liming resulted in a decrease of Cu in the exchangeable and organic matter fractions and an increase in the Fe and Mn oxide fractions and in the residual fraction. Without liming, the organic matter fraction presented the highest contribution to Cu content found in the soil extracts obtained with all extractors, except EDTA. For treatments with liming, Cu contents in the organic matter fraction were better correlated to Cu contents in extracts obtained with DTPA and Mehlich-3.
机译：了解土壤中铜的化学形式以及这些形态与土壤铜有效性之间的关系对于预测土壤-植物系统中的铜行为至关重要。本工作研究了石灰对六种类型的Oxisol中铜的有效含量以及铜馏分形式的影响。在有和没有石灰的情况下，土壤样品分别以0.0、20.0和40.0 mg dm-3的速率接受铜，并孵育30天。然后，可用Mehlich-1，Mehlich-3，DTPA和EDTA溶液萃取可用的铜，并通过原子吸收分光光度法进行分析。此外，按顺序提取土壤样品，以确定土壤中的Cu，如下：可交换Cu组分，有机物Cu组分，Mn氧化物-Cu组分，非晶Fe氧化物-Cu组分，结晶Fe氧化物-Cu含量，残留铜含量和土壤中总铜含量。添加了Cu的土壤样品在有机质组分中的Cu保留率较高，而在可交换Cu组分中的保留率很小。石灰导致可交换和有机物部分中的Cu减少，Fe和Mn氧化物部分和残留部分的增加。在没有石灰的情况下，除EDTA之外，所有其他提取器所获得的土壤提取物中，有机物成分对铜含量的贡献最大。对于石灰处理，有机物部分中的Cu含量与DTPA和Mehlich-3提取物中的Cu含量更好相关。

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