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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Phytoavailability control based management for paddy soil contaminated with Cd and Pb: Implications for safer rice production
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Phytoavailability control based management for paddy soil contaminated with Cd and Pb: Implications for safer rice production

机译：基于植物有效性控制的镉和铅污染的稻田管理：对更安全生产水稻的影响

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摘要

A metal phytoavailability control based management protocol for a metal contaminated paddy soil was investigated as an alternative to conventional engineering-based remediation methods such as 'clean soil cover' for safer rice crop production. The accumulation of Cd and Pb in rice was monitored following application of three pH change-induced immobilizing agents (dolomite, steel slag, and agricultural lime) and two sorption agents (zeolite and compost) to a Cd and Pb contaminated paddy soil. Changes in the phytoavailable pool of Cd and Pb in soils following the application of each immobilizing agents were also determined using 1 M NH4NO3 extraction. Among the immobilizing agents considered, pH change-induced immobilizers were more effective than sorption agents; exhibiting more significant decreases (p 0.001) in phytoavailable Cd and Pb concentrations. The phytoavailable pool of these metals was even lower than those measured in the 'clean soil cover' where the total metal concentrations of the plow layer were reduced via capping the surface with uncontaminated soil. Consequently, the decline in the phytoavailable pool of Cd and Pb in soil induced by immobilizing agents resulted in significantly lower accumulation of these metals in the rice grain (0.02-0.03 mg kg(-1) for Cd and 0.11-0.16 mg kg(-1) for Pb) compared to those measured in the rice cultivated in the control (unammended) soil (0.16-0.23 mg kg(-1) for Cd and 0.19-0.30 mg kg(-1) for Pb). This indicated that immobilization using pH-change induced immobilizing agents was a feasible approach for safe rice crop production in Cd and Pb contaminated paddy soils. (C) 2015 Elsevier B.V. All rights reserved.
机译：研究了一种基于金属植物利用率控制的金属污染稻田管理协议，以替代传统的基于工程的补救方法，例如“清洁土壤覆盖”，以更安全地种植水稻。在将三种pH变化引起的固定剂（白云石，钢渣和农业石灰）和两种吸附剂（沸石和堆肥）施用到受Cd和Pb污染的水稻土上后，监测了Cd和Pb在水稻中的积累。还使用1 M NH4NO3萃取法测定了每种固定剂施用后土壤中Cd和Pb的植物有效性库的变化。在考虑的固定剂中，pH变化诱导的固定剂比吸附剂更有效。在植物体内可利用的Cd和Pb浓度降低幅度更大（p <0.001）。这些金属的植物有效利用量甚至比“清洁的土壤覆盖”中测得的要低，在“清洁的土壤覆盖”中，耕作层的总金属浓度通过用未污染的土壤覆盖表面而降低。因此，固定剂诱导的土壤中Cd和Pb的植物有效性库的下降导致水稻籽粒中这些金属的积累显着降低（Cd为0.02-0.03 mg kg（-1）和0.11-0.16 mg kg（- 1）的Pb）与在对照土壤（未改良）中种植的大米中测得的那些相比（Cd为0.16-0.23 mg kg（-1），Pb为0.19-0.30 mg kg（-1））。这表明使用pH变化诱导的固定剂固定化是在Cd和Pb污染的水稻土上安全生产水稻作物的可行方法。 （C）2015 Elsevier B.V.保留所有权利。

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