Dynamic influence of S fertilizer on Cu bioavailability in rice (Oryza sativa L.) rhizosphere soil during the whole life cycle of rice plants

文献类型： 外文期刊

第一作者： Sun, Lijuan

作者： Sun, Lijuan;Liu, Qinglin;Xu, Chen;Peng, Cheng;Shi, Jiyan;Sun, Lijuan;Liu, Qinglin;Xu, Chen;Peng, Cheng;Shi, Jiyan;Sun, Lijuan;Xue, Yong;Xu, Chen;Peng, Cheng;Yuan, Xiaofeng

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关键词： Bioavailability; Cu; Paddy rice; Speciation; S fertilizer

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

年卷期： 2019 年 19 卷 1 期

页码：

收录情况： SCI

摘要： PurposeAddition of S fertilizer influences the behavior of metals in soil, the mechanism of which has not been extensively studied to date. We explored the dynamic influence of S fertilizer (S-0 and Na2SO4) applied in paddy soils on Cu bioavailability in rice rhizosphere soil during the life cycle of rice plants.Materials and methodsThrough a microcosm experiment, the speciation of Cu and S in rhizosphere soil was explored by traditional chemical extraction methods and advanced synchrotron-based X-ray absorption near-edge spectroscopy (XANES) techniques.Results and discussionIn the vegetative stages of rice plants, sulfur fertilization increased the concentration of bioavailable Cu, as well as the dissolved organic carbon (DOC) concentration in rhizosphere soil. Meanwhile, a higher proportion of Cu-humic substances was found in soil treated with S than that in control soil. However, extended flooding conditions led to the reduction of S fertilizer to sulfide, which provided the substrate for Cu2S formation. Thus, in the reproductive stages of rice plants, a higher proportion of Cu2S formation from +S treatments led to a relatively lower concentration of bioavailable Cu in rice rhizosphere soil than in control soil.ConclusionsThe influence of S fertilizer on Cu bioavailability depended on the growth stage of rice plants. Both the DOC and redox potential (Eh) were changed by S fertilization in paddy soils and are critical factors that control Cu speciation in rice rhizosphere soil.

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