Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (30): 62-67.doi: 10.11924/j.issn.1000-6850.casb20191000722

Special Issue: 水稻

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Characteristics and Influencing Factors of Cadmium Accumulation in Rice: Gleyed Paddy Soil and Hydrogric Paddy Soil

Zheng Shun’an1,2(), Liu Daili1,2, Zhang Mingkui3(), Zhang Shuang3   

  1. 1Agricultural and Rural Ecology and Resource Protection Station, Beijing 100125
    2Key Laboratory of Resource Recycling Technology and Model, Ministry of Agriculture and Rural Affairs, Beijing 100125
    3College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058
  • Received:2019-10-15 Revised:2019-12-10 Online:2020-10-25 Published:2020-10-16
  • Contact: Zhang Mingkui E-mail:zhengshunan@gmail.com;mkzhang@zju.edu.cn

Abstract:

Cadmium pollution in farmland soil and rice grain is serious in China. To understand the relationship between accumulation of cadmium in paddy soil and in rice organs can provide a basis for safe production of rice. Taking the gleyed and hydrogric paddy soil as the research objects, the characteristics and influencing factors of cadmium accumulation in rice growth in both types of paddy soil were studied by collecting soil and rice samples in pairs. The results showed that under similar soil cadmium pollution, the cadmium accumulation in the organs of rice grown in the gleyed paddy soil was significantly lower than that in the hydrogric paddy soil. The average contents of cadmium in the stems-leaves and brown rice of the rice plant grown in the gleyed paddy soil were only 55.53% and 56.10% of that in the hydrogric paddy soil, indicating that the amount of Cd uptake by rice plant from the gleyed paddy soil was significantly lower than that from the hydrogric paddy soil. The total soil cadmium content was the main factor that affected the accumulation of cadmium in organs of rice plants grown in both soils. However, the effects of other factors on cadmium accumulation in rice organs were quite different between the two types of farmland soils. The factors that affected the accumulation of cadmium in the gleyed paddy soil were exchangeable ferrous and clay content, while the CEC in the hydrogric paddy soil was an important factor. The results also showed that the available cadmium in the gleyed paddy soil determined by fresh soil samples was more effective than that determined by air-dried soil for predicting cadmium accumulation in rice organs. It is concluded that soil gleization could reduce the uptake of cadmium by rice and the risk of cadmium contamination in brown rice.

Key words: gleization, ferrous, rice, cadmium, safe production

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