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| Effect of water levels on cadmium and arsenic absorption and transportation in rice |
| Received:March 06, 2018 |
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| KeyWord:cadmium;arsenic;water management;absorption;transportation |
| Author Name | Affiliation | E-mail | | WU Jia | Changsha Social Work College, Changsha 410004, China | | | JI Xiong-hui | Hunan Institute of Agro-Environment and Ecology/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410125, China
Ministry of Agriculture Key Lab of Agri-Environment Institute in the Midstream of Yangtze River Plain, Changsha 410125, China | | | WEI Wei | Hunan Institute of Agro-Environment and Ecology/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410125, China
Ministry of Agriculture Key Lab of Agri-Environment Institute in the Midstream of Yangtze River Plain, Changsha 410125, China | | | XIE Yun-he | Hunan Institute of Agro-Environment and Ecology/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China
Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410125, China
Ministry of Agriculture Key Lab of Agri-Environment Institute in the Midstream of Yangtze River Plain, Changsha 410125, China | yunhexie@163.com |
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| Abstract: |
| To investigate the effects of water levels(water depths and phreatic water levels) on arsenic(As) and cadmium(Cd) absorption and transportation in rice, pot experiments with water depths of 3, 6, 9 cm and phreatic water levels of -3, -6, -9 cm were carried out. The results showed that different water levels above ground had no significant impact on rice yield. However, groundwater levels decreased the yields by 21.06%~28.44% when compared to wetness as the control(CK). Regarding Cd and As absorption and transportation, water depth greatly decreased the Cd contents in grain, stem, and leaves but promoted As accumulation in roots. For example, Cd content in grain decreased by 61.11%~69.43% compared to that in CK. However, groundwater levels increased Cd content by 4.08~4.48 times in rice grain, whereas it decreased As content by 79.20%~81.96% compared to that in CK. Under different water regimes, As and Cd transportation from soil to roots played a determinant role in As and Cd accumulation in rice. As and Cd contents in rice grains were also regulated by the transportation and distribution of As and Cd levels in roots, stems, and leaves. No significant differences in As and Cd concentrations among grain, stem, leaves, and roots were observed between different submergence depths or phreatic water levels. These results indicate that Cd and As absorption and accumulation were mainly limited by the two flooding forms. Correlation analysis revealed that there was a highly significant negative correlation between As and Cd levels in rice grain water depths. Thus, our results suggest that appropriate water management strategies should be used to combat high levels of As and Cd in rice grains from soil Cd and As pollution. |
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