矿物调理剂对稻田土壤镉形态和水稻镉吸收的影响

doi:10.3864/j.issn.0578-1752.2018.11.012

Abstract

Abstract: 【Objective】 The purpose of this study was to explore the effects of application of a mineral conditioner on the forms of Cd in paddy soil and Cd uptake by rice and to provide directions of field application of this conditioner. 【Method】 An alkaline mineral source composite material was selected as the tested conditioner and a pot experiment with dynamic sampling pattern was carried out to research Cd forms in paddy soil and to analyze the translocation of Cd in rice plant at different growth stages.【Result】The mineral conditioner effectively increased soil pH, reduced soil DTPA-Cd content, and continuous shifted Cd from exchangeable Cd fractions to hard usable and residual fractions. The conditioner significantly reduced Cd content in rice root, stem and leaf, glume and hulled rice, and dosages of conditioner showed negative correlation with Cd content in different parts of rice. The Cd content of different rice parts were significantly positively correlated with soil DTPA-Cd and soil Ex-Cd, but negatively correlated with soil Ox-Cd at returning green and booting stage. The growth period of rice significantly affected Cd content of root and stem leaf. In different growth periods of CK treatment, the sequence of Cd content in rice root was mature stage ≈ green stage＞jointing stage＞tillering stage＞botting stage, but the sequence of Cd content in stem leaf of CK treatment showed green stage＞mature stage＞tillering stage＞jointing stage＞botting stage; compared with CK treatment, there had largest decline of Cd content in root, stem and leaf, rice hull and hulled rice at mature stage, with 92.0%, 94.1%, 86.3%, 80.6%, respectively; when the dosage of conditioner reached to 5 g·kg^-1, the Cd content of pulled rice decreased to the national standard of food safety (0.2 mg·kg^-1). The sequence of Cd content in different rice organs showed root>>stem and leaf>>hulled rice＞rice hull. For the bio-transportation factor of Cd transforms from root to stem and leaf at different periods, by conditioner, the resistance control effect on Cd at early growth stage was superior than that in late growth stage.【Conclusion】Tested conditioner could shift Cd from high active fractions to low active fractions, and effectively restrict Cd uptake in each rice parts.

Key words: mineral conditioner, Cd, BCF, TF

LI Chao, AI ShaoYing, TANG MingDeng, LI LinFeng, WANG YanHong, LI YiChun. Effects of a Mineral Conditioner on the Forms of Cd in Paddy Soil and Cd Uptake by Rice[J].Scientia Agricultura Sinica, 2018, 51(11): 2143-2154.

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