Effect of Chinese milk vetch combined with lime on cadmium uptake and translocation in rice
XIAO Min1,2, FAN Jing-jing2, WANG Hua-jing1, XU Chao2, ZHANG Quan2, CHEN Xin-sheng2, ZHU Han-hua2, ZHU Qi-hong2, HUANG Dao-you2
1. College of Geography and Resources Science, Sichuan Normal University, Chengdu 610066, China; 2. Changsha Research Sation for Agricultural & Environmental Monitoring, Chinese Academy of Sciences, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
Abstract：A plot experiment was conducted to study the combined effects of Chinese milk vetch (CMV) and lime (L) on the availability of Cd in soil, the concentrations of Cd in Fe-Mn plaque on roots and the uptake and transport of Cd in rice plants. The results showed that soil pH value was significantly increased by 2.11~2.43 and 1.68~2.48 units, and DTPA-Cd concentration decreased by 18.88%~40.53% and 20.74%~36.85% in L and CMVL treatments, respectively, while it had no significant effect on them in CMV treatment. The Cd concentration in Fe-Mn plaque on rice roots at maturity in CMV treatment was significantly increased by 86.72%, that in roots was increased by 124.27% while that of Cd in grains was increased by 58.54%, which the transport coefficient of Cd from leaf to grain was increased by 5.58 times. The Cd concentration in Fe-Mn plaque on rice roots at maturity in L and CMVL treatments were significantly increased by 34.86% and 42.42%, while the transport coefficient of Cd from Fe-Mn plaque on rice root to root significantly increased by 170.6% and 158.8%, respectively. However, the transport coefficient of Cd from root to stem in L and CMVL treatments was significantly decreased by 75.87% and 74.71%, while those of Cd from root to grains decreased by 74.38% and 68.13%, respectively. Cd concentrations of rice grains in L and CMVL treatments were significantly reduced by 54.88% and 51.83%, respectively. Pearson correlations indicated that soil pH, DTPA-Cd and Cd concentration in Fe-Mn plaque on roots were the key factors on the Cd concentration of rice grains. Chinese milk vetch combined lime to Cd-contaminated rice fields can significantly reduce the Cd in rice grains.
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