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Impacts of soybean growth on Cu speciation and distribution in two rhizosphere soils

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Abstract

The effects of soybean growth on Cu speciation and distribution in two artificially Cu-contaminated soils (phaiozem, a Mollisol, and burozem, an Alfisol) were investigated using a rhizobox culture system followed by the sequential chemical extraction technique. The rhizosphere soils in the rhizobox were separated with nylon cloth into 11 sections: a central zone (4 mm in width) and ten side rhizosphere subzones (1 mm in width). The Cu fractions in Cu-contaminated phaiozem could be ranked as EXCH (exchangeable Cu)<ACID (HAc extractable Cu)< FeMnOX (bound to Fe–Mn oxides)<OM (bound to organic matter)<RES (residual Cu), and in Cu-contaminated burozem as EXCH< FeMnOX< OM< ACID< RES. Soybean growth resulted in an obvious increase of EXCH-Cu in the rhizosphere soil in the first 4 weeks of incubation, with the biggest increase in the central zone. Compared with the unplanted control soil, the content of ACID-Cu in soybean rhizosphere increased in the first 2–3 weeks of incubation and then decreased towards the end of the experiment (6 weeks). The increasing tendency was also observed in the FeMnOX-Cu fraction during the first 3 weeks and the OM-Cu fraction during the first 4 weeks, and their increments were obviously larger than those of the EXCH-Cu and ACID-Cu fractions. This suggested that more RES-Cu activated by the action of soybean roots was partitioned into the less phytoavailable forms, FeMnOX-Cu and OM-Cu. This may be of a benefit to the normal growth of soybean in Cu-contaminated soils. By the end of cultivation, the content of FeMnOX-Cu decreased, but only a small part of Cu was absorbed by soybean, being most of the Cu loss partitioned into the RES-Cu fraction.

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Acknowledgements

The research was financially supported by the Ministry of Science and Technology, People’s Republic of China as a 973 project (No. 2004CB418503) and by the National Natural Science Foundation of China as a grant (No. 20225722) to an outstanding young scientist and as a key project (20337010).

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Correspondence to Qi-xing Zhou.

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Yu, Y., Zhou, Qx. Impacts of soybean growth on Cu speciation and distribution in two rhizosphere soils. Biol Fertil Soils 42, 450–456 (2006). https://doi.org/10.1007/s00374-006-0090-9

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