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Study on the Migration, Transformation and Prediction Model of Cadmium in the Whole Growth Stage of Late Rice
Yang Guohang, Li Qiong, He Lizhao, Gu Jing, Niu Jing, Zhang Haiou, Zheng Zijian, Zhao Zhen
PDF(1548 KB)
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Study on the Migration, Transformation and Prediction Model of Cadmium in the Whole Growth Stage of Late Rice
To better understand the migration, transformation and prediction model of cadmium (Cd) in the whole growth stage of late rice, we used soil-rice point-to-point data of Cd in field test in Wangcheng Changsha to study the differences of absorption, accumulation and distribution of Cd in different parts (root, stem and leaf, grain) of rice and its four typical growth stages (seedling stage, tillering stage, filling stage and mature stage). The results indicate that the Cd content and enrichment ability of each part in the same growth stage are all the roots> stems and leaves> grains, and the Cd content in roots are significantly higher than that in other parts, and there are significant differences in different growth stages, namely mature stage> filling stage> tillering stage> seedling stage. The transport capacity of Cd is soil root> root-stem and leaf> stem and leaf-grain> root-grain, most of the Cd in grain is from the transfer of the stem and leaf, and the transport capacity of Cd in tillering stage is significantly higher than that in other stages. The accumulation and distribution differences of Cd are stem and leaf> root> grain, and the tillering stage and mature stage are much higher than seedling stage and filling stage. The main factors affecting the Cd absorption are soil pH and available cadmium (ACd) content, pH has a negative effect and available cadmium has a positive effect, and the Cd content in stems and leaves of tillering stage is most affected by them, therefore it is the key stage to control Cd into grain. The pH and available cadmium in tillering stage could be used to predict Cd content of grains in mature stage, and the optimal prediction model is lgCdthe grain in maturity stage= 0.158- 0.099pHtillering stage+ 0.261lgACdtillering stage. The research results could provide a theoretical basis and data support for the risk assessment and controlling of soil Cd pollution in rice fields in Changzhutan area of China.
late rice / growth stage / cadmium / migration and transformation / physical and chemical properties of soil / prediction model {{custom_keyword}} /
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