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首页> 外文期刊>Journal of environmental sciences >Effect of water-driven changes in rice rhizosphere on Cd lability in three soils with different pH
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Effect of water-driven changes in rice rhizosphere on Cd lability in three soils with different pH

机译：水稻根际水稻根际对三种土壤镉耐性的影响

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摘要

Pot experiments were conducted to evaluate the effect of water management, namely continuous flooding (CF), intermittent flooding (IF) and non-flooding (NF), on Cd phytoavailaility in three paddy soils that differed in pH and in Cd concentrations. Diffusive gradients in thin films (DGT) technique was employed to monitor soil labile Cd and Fe concentrations simultaneously at three growth stages (tillering, heading and mature stage) of rice. The Cd phytoavailability were generally in the order of NF > IF > CF, and higher rice Cd (over permitted level, 0.2 mg/kg) were only found in neutral and acidic soils under NF conditions. DGT measured soil labile Cd rather than total Cd was the most reliable predictor for Cd accumulation in rice. CF enhanced the formation of root plaques, which related to oxidation of large quantities of available Fe on root surfaces due to the O-2 secretion of rice root. The Cd concentration in root plaques shared the same trend with DGT-Cd. Generally, root plaques would inhibit Cd uptake by rice under CF conditions, while under IF and NF conditions, root plaques act as a temporarily store of Cd, and soil labile Cd is the key factor that controls the transfer of Cd from soil to rice. The results of principle component analysis revealed that water management had the greatest effect on soil Cd lability and rice Cd in acidic soil. Thus, it is important to consider the availability of Cd and soil pH when assessing current agricultural practices of contaminated soil in China. (c) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
机译：进行了盆栽实验以评估水管理，即连续洪水（CF），间歇性泛滥（IF）和非洪水（NF）的效果，在三个水稻土壤和CD浓度下不同的镉植物土壤中。薄膜（DGT）技术中的扩散梯度用于在水稻的三个生长阶段（分蘖，标题和成熟阶段）同时监测土壤不稳定CD和Fe浓度。 CD PhytoAvailability通常为NF>如果> CF和较高的水稻CD（超过允许水平，0.2mg / kg），则仅在NF条件下的中性和酸性土壤中发现。 DGT测量土壤不稳定CD而不是总CD是水稻CD积累中最可靠的预测因子。 CF增强了根部斑块的形成，由于稻根的O-2分泌而与根表面上的大量可用Fe的氧化有关。根斑块中的CD浓度与DGT-CD共享相同的趋势。通常，根斑块会在CF条件下抑制CD的CD摄取，而在IF和NF条件下，根斑块作为CD的临时储存，土壤不稳定CD是控制从土壤转移到水稻中的关键因素。原理成分分析结果表明，水管理对酸性土壤CD湿度和水稻CD具有最大的影响。因此，在评估中国污染土壤的当前农业实践时，重要的是考虑CD和土壤pH的可用性。 （c）2019中国科学院生态环境科学研究中心。 elsevier b.v出版。

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  • 来源
    《Journal of environmental sciences》 |2020年第2020期|共11页
  • 作者

    Wang Jinjin; Li Dongqin; Lu Qin; Zhang Yulong; Xu Huijuan; Wang Xueli; Li Yongtao;

  • 作者单位

    South China Agr Univ Joint Inst Environm Res &

    Educ Coll Nat Resources &

    Environm Guangzhou 510642 Guangdong Peoples R China;

    South China Agr Univ Joint Inst Environm Res &

    Educ Coll Nat Resources &

    Environm Guangzhou 510642 Guangdong Peoples R China;

    South China Agr Univ Joint Inst Environm Res &

    Educ Coll Nat Resources &

    Environm Guangzhou 510642 Guangdong Peoples R China;

    South China Agr Univ Joint Inst Environm Res &

    Educ Coll Nat Resources &

    Environm Guangzhou 510642 Guangdong Peoples R China;

    South China Agr Univ Joint Inst Environm Res &

    Educ Coll Nat Resources &

    Environm Guangzhou 510642 Guangdong Peoples R China;

    Guangxi Univ Coll Agr Nanning 530004 Peoples R China;

    South China Agr Univ Joint Inst Environm Res &

    Educ Coll Nat Resources &

    Environm Guangzhou 510642 Guangdong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境污染及其防治;
  • 关键词

    Cadmium lability; Rhizosphere; Rice; Water management; Root plaque; DGT technique;

    机译：镉耐性;根际;水稻;水管理;根斑块;DGT技术;

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