Effects of an Amendment on Cadmium Transportation in the Rhizosphere Soil-Rice System

被引：0

作者：

Li Y.-C. ^{[1
,2
,3
,4
]}

Wang Y.-H. ^{[1
,3
,4
]}

Tang M.-D. ^{[1
,3
,4
]}

Wu B.-F. ^{[1
,3
,4
]}

Li L.-F. ^{[1
,3
,4
]}

Ai S.-Y. ^{[1
,3
,4
]}

Ling Z.-X. ^{[5
]}

机构：

[1] Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou

[2] College of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou

[3] Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou

[4] Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou

[5] Ecological Development Service Center, People's Government of Heshui Town, Xingning City, Guangdong Province, Heshui

来源：

Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 07期

关键词：

Amendment; Cadmium (Cd); Iron (Fe) redox cycle; Rhizosphere soil; Rice;

D O I：

10.13227/j.hjkx.201811016

中图分类号：

学科分类号：

摘要：

The remediation of cadmium (Cd) contaminated paddy soils has become an important issue in the field of remediation of agricultural soils contaminated by heavy metals. The iron (Fe) redox cycle (referring to the fluctuation of iron between the ferrous (Ⅱ) and ferric (Ⅲ) oxidation states) exhibits a unique role in the transportation of Cd in the soil-rice system. The exploration of practical remediation strategies for Cd from the perspective of the Fe redox cycle is expected to obtain some state-of-the-art technologies and products to reduce Cd accumulation in rice grains. In this study, an amendment was selected and a field experiment was carried out to investigate the effects of this amendment on Cd transportation from the rhizosphere soil to the Fe plaque, and further to different rice tissues at four different growth stages, and to highlight some possible mechanisms by which the Fe redox cycle controls Cd availability in rice paddy fields. The results showed that the amendment induced the formation of Fe sulfides, which co-precipitated with Cd, reducing the NH4Ac-extractable Cd content in rhizosphere soils at the tillering, jointing, and filling stages; the oxidation of Fe sulfides increased the NH4Ac-extractable Cd content in the rhizosphere soil at the maturing stage; the formation of Fe sulfides in rhizosphere soils impeded the migration of Fe(Ⅱ) from the rhizosphere soil to the root surface, decreasing the content of DCB-extractable Fe and Cd in Fe plaques at the tillering and filling stages; the amendment inhibited Cd transportation from the roots to other tissues, increasing the proportion of Cd in the roots at the jointing, filling, and maturing stages, but decreasing the proportion in the straws at the jointing, filling, and maturing stages, and in the rice grain at the maturing stage. These findings provide a theoretical basis for the exploration and application of the amendment, and have significance in the field of remediation of Cd-contaminated paddy soils. © 2019, Science Press. All right reserved.

引用

页码：3331 / 3338

页数：7

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