Provoking effects of exogenous Zn on cadmium accumulation in rice

被引：6

作者：

Gu J.-F. ^{[1
]}

Yang W.-T. ^{[2
]}

Zhou H. ^{[1
]}

Zhang P. ^{[1
]}

Peng P.-Q. ^{[1
]}

Liao B.-H. ^{[1
]}

机构：

[1] College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha

[2] College of Bioscience and Technology, Hunan Agricultural University, Changsha

来源：

Huanjing Kexue/Environmental Science | 2016年 / 37卷 / 09期

关键词：

Accumulation; Cd pollution; Exogenous Zn; Rice; Soil;

D O I：

10.13227/j.hjkx.2016.09.038

中图分类号：

学科分类号：

摘要：

Pot experiments were carried out to study the influences of different concentrations of exogenous Zn on accumulation of Cd in various rice organs of low Cd accumulation cultivar Xiang -Wanxian 12 (XWX12) and high Cd accumulation cultivar Wei-You 46 (WY 46) exposed to soil with medium and serious Cd pollution. The results showed that: In the soil with medium Cd pollution, Cd contents in various rice organs of two rice varieties were increased by exogenous Zn, and the Cd contents in brown rice of XWX12 and WY46 were increased by 125.0%-275.0% and 6.6%-91.2%, respectively, but still lower than 0.2 mg·kg-1. In the soil with serious Cd pollution, Cd accumulation in various rice organs were reduced by exogenous Zn. Cd contents in brown rice of XWX12 and WY46 were reduced by 16.6%-63.5%, and 15.6%-74.4%, respectively, and Cd contents in brown rice of WY 46 were gradually decreased with increasing exogenous Zn application, resulting in lower than 0.2 mg·kg-1of Cd in brown rice. The correlations of Cd contents in brown rice and exchangeable contents of Cd and Zn in soil were different depending on the Cd pollution levels and the rice varieties. In the soil with medium Cd pollution, Cd content in brown rice of XWX12 was linearly positively related to exchangeable Zn content in soil, and Cd content in brown rice of WY46 was linearly positively related to exchangeable Cd or Zn contents in soil. In the soil with serious pollution, however, the correlation of Cd contents in brown rice of WY46 and the contents of exchangeable Cd or Zn in soil was linear negative correlation. Therefore, for improvement of the rice quality, under the condition that total Zn content in soil was lower than the pollution level, applying a certain amount of Zn to reduce Cd contents in brown rice was feasible in the soil with serious pollution. © 2016, Science Press. All right reserved.

引用

页码：3554 / 3561

页数：7

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