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《Soils》 2009-04
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Effects of Lead Pollution in Soil and on Leaf on Distribution and Accumulation of Lead in Rice

LI Xiao-ming,YIN Yun-long,HUANG Yu-jie,XU He-bao ( Institute of Botany,Jiangsu Province and Chinese Academy of Sciences,Nanjing 210014,China )  
A Pb pollution pot experiment was conducted by adding Pb(OAC)2.3H2O in a yellowbrown soils and spraying it to rice leaf. The results showed that:when the added Pb was 2000 mg/kg,the aboveground dry weight of rice decreased significantly,but the yield of rice didn't change significantly. Leaf Pb pollution had no significant effect on the aboveground dry weight and yield of rice. Pb concentration in every organ of rice increased significantly as Pb concentration increased,Pb accumulation order in rice organs was root leaf stalk seed in soil pollution and leaf root stalk seed in leaf pollution. Pb concentration in the leaf was significantly correlated with Pb concentration in the seed. A curve was established for fitting Pb concentration in the seed and added Pb concentration,and according to the curve,the toxicity threshold value of Pb total concentration is 95.7 mg/kg in the yellowbrown soil and the added Pb threshold value is 46.2 mg/L on the rice leaf under the experimental condition,i.e.,9 spraying time and 200 ml per time.
【Fund】: 江苏省自然科学基金重点项目(BK2006711-2)资助
【CateGory Index】: X53
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