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| Influences of phosphate nutritional level on the phytoavailability and speciation distribution of cadmium and lead in soil | |
| 作者姓名： | CHEN Su SUN Tie-heng SUN Li-n ZHOU Qi-xing CHAO Lei |
| 作者单位： | 1. Key Laboratory of Terrestrial Ecological Process，Institute of Applied Ecology，Chinese Academy of Sciences，Shenyang 110016，China. 2. Key Laboratory of Environment Engineering of Shenyang University，Shenyang 100041，China; 3. Graduate School of Chinese Academy of Sciences，Beijing 100039，China |
| 基金项目： | 国家重点基础研究发展计划(973计划);国家自然科学基金 |
| 摘 要： | IntroductionNorth-east China is one of the most importantindustrial bases and also a main agriculturalproduction area. Land disposal of wastes and irrigatingwith sewage have led to increasing heavy metalcontents in soil (Chen, 1996) and the problemsinduce… |
| 关 键 词： | 磷酸盐 镉 土壤污染 污染化学 铅 重金属 |
| 文章编号： | 1001-0742（2006）06-1247-07 |
| 收稿时间： | 2006-04-25 |
| 修稿时间： | 2006-07-31 |
Influences of phosphate nutritional level on the phytoavailability and speciation distribution of cadmium and lead in soil |
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| CHEN Su,SUN Tie-heng,SUN Li-n,ZHOU Qi-xing,CHAO Lei.Influences of phosphate nutritional level on the phytoavailability and speciation distribution of cadmium and lead in soil[J].Journal of Environmental Sciences,2006,18(6):1247-1253. | |
| Authors: | CHEN Su SUN Tie-heng SUN Li-n ZHOU Qi-xing and CHAO Lei |
| Institution: | 1. Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;Key Laboratory of Environment Engineering of Shenyang University, Shenyang 100041, China;Graduate School of Chinese Academy of Sciences, Beijing 100039, China 2. Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China 3. Key Laboratory of Environment Engineering of Shenyang University, Shenyang 100041, China 4. Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;Graduate School of Chinese Academy of Sciences, Beijing 100039, China |
| Abstract: | A pot experiment was conducted to examine the influence of phosphate levels on the phytoavailability and speciation distribution of cadmium (Cd), lead (Pb) in soil. Spring wheat (Triticum aestivum L.) was selected as the tested plant. There were 5 phosphate fertilizer(Ca(H2PO4)2) levels including 0, 50, 100, 200, and 400 mg P2O5/kg soil, marked by PO, Pl, P2, P3, and P4, respectively. CdCl2·2.5H2O and Pb(NO3)2 were added to soil as the following levels: Cd + Pb = 25+0, 0+1000, and 25+1000 mg/kg, marked by Tl, T2, and T3, respectively. The results showed that the P fertilizer promoted the dry weight of wheat in all treatments and alleviated the contamination induced by Cd and Pb. With increasing levels of the additional P fertilizer, Cd concentration in different parts (root, haulm, chaff and grain) of wheat decreased at the P1 level at first and then increased. The soluble plus exchangeable (SE) fraction of Cd in soil decreased at the P1 level and then increased from P2 to P4 levels. The moderate P fertilizer reduced the phytoavailability of Cd. The application of P could obviously restrain the uptake of Pb by wheat and there were significantly negative correlations between the levels of P and the uptake of Pb. Phosphorus supply resulted in a decrease in the SE fraction of Pb and there was a significantly negative correlation between the levels of P and the SE fraction of Pb in soil. All the levels of the P fertilizer in this experiment could reduce the phytoavailability of Pb. Thus, it is feasible to apply the P fertilizer (Ca(H2PO4)2) to Pb contaminated soils. However, the levels of P application should be restricted in case that redundant P may increase the phytoavailability of Cd. |
| Keywords: | phosphate phytoavailability speciation distribution cadmium lead |
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