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| Effect of different water management modes on rice(Oryza sativa L.) growth and heavy metal transport characteristics |
| Received:May 07, 2017 |
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| KeyWord:rice(Oryza sativa L.);water management;heavy metal transport characteristics |
| Author Name | Affiliation | E-mail | | CUI Xiao-ying | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P. R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | | | QIN Jun-hao | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P. R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | | | LI Hua-shou | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P. R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | lihuashou@scau.edu.cn |
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| Abstract: |
| A pool experiment was conducted to study the effects of two water management modes as continuous flood(CF) and interval flood(IF) on the growth and Pb, Cd, and Cr accumulation of two kinds of Oryza sativa L.(conventional rice and hybrid rice) cultivars. The results showed that the irrigation mode of IF signicantly increased the rice biomass and yield. However, this irrigation mode enhanced the mobilization of Pb, Cd, and Cr in the soil-rice system and signicantly increased the accumulation of Cd in the roots and Cr in the grains. Furthermore, the transport characteristics of Cr were different from those of Pb and Cd in the rice system during the water management modes. The accumulation order of Pb and Cd in the rice was root > stem and leaf > grain, whereas grain/stem and leaf > root was the order for Cr. In addition, the water management modes had a greater impact on the accumulation of Cr in the grain of conventional rice than in the grain of hybrid rice. Although the IF irrigation mode could significantly promote the growth of rice, it significantly increased the bioavailabilities of Cd and Cr as well. Therefore, the different responses of rice to different heavy metals should be considered when water management is conducted to reduce heavy metal bioavailability and heavy metal pollution, in order to effectively mitigate heavy metal pollution in farmland environment systems. |
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