两种低镉积累水稻镉含量与土壤镉的剂量-效应关系及调控

doi:10.11934/j.issn.1673-4831.2017.08.011

Abstract

Abstract:

In order to assess production potential of two low Cd accumulating varieties (Oryza sativa L. Jia-33 and Xiushui-128) of rice in Cd contaminated paddy fields in Xiangyin of Hunan, a field experiment was conducted to explore relationship of Cd content in rice with soil Cd concentration, threshold of soil Cd concentration for safety production of polished rice, and impacts of soil pH and soil organic matter content on Cd concentration in polished rice. Results show that Cd concentrations in polished rice of both cultivars (Jia-33 and Xiushui-128) were significantly and positively related to concentration of soil available Cd in the paddy field with correlation coefficient being 0.982 and 0.978, respectively. According to the criteria in the National Standard for Grains and Food Safety (GB 2715-2012), the threshold of soil available Cd for safety production of Jia-33 and Xiushui-128 was 0.307 and 0.293 mg·kg^-1, respectively. Increased soil pH and content of soil organic matter by liming and application of organic manure reduced the content of soil available Cd in the paddy field, and hence uptake, transport and accumulation of Cd in rice. Pearson analysis reveals that Cd accumulation in polished rice was significantly and negatively related to soil pH and content of organic matter, which indicates that the two are important factors regulating cadmium accumulation in polished rice.

Key words: rice, cadmium, dose-dependent effect, regulation

CLC Number:

HUANG Yu, LIAO Min, YE Zhao-jin, LÜ Ting. Cd Concentrations in Two Low Cd Accumulating Varieties of Rice and Their Relationships With Soil Cd Content and Their Regulation Under Field Conditions[J]. Journal of Ecology and Rural Environment, 2017, 33(8): 748-754.

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Cd Concentrations in Two Low Cd Accumulating Varieties of Rice and Their Relationships With Soil Cd Content and Their Regulation Under Field Conditions

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