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| Effects of hydroxyapatite on absorption and transfer of Pb and Cd in soil-rice system |
| Received:September 20, 2015 |
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| KeyWord:hydroxyapatite;rice;heavy metals;absorption;transfer |
| Author Name | Affiliation | E-mail | | TANG Shou-yin | College of Resource and Environmental Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | DONG Hai-xia | College of Resource and Environmental Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | ZHAO Ming-liu | College of Resource and Environmental Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | LI Hong-hong | College of Resource and Environmental Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | WANG Guo | College of Resource and Environmental Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China | 1400619353@qq.com |
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| Abstract: |
| Hydroxyapatite(HAP) is effective in reducing heavy metal availability to plants. Here the effects of hydroxyapatite(HAP) on availability of Pb and Cd in soil, absorption of Pb and Cd by Yiyou 673(Indica, Oryza sativa Linn. subsp. indica Kato), and transfer of Pb and Cd within rice plant were studied in a pot experiment. HAP was applied to a Pb-Cd-Zn contaminated paddy soil at a rate of 0, 2, 4, 8, 16 and 32 g·kg-1. Results showed that HAP amendment significantly increased soil pH. Compared with the control, available Pb(DTPA-extractable) and Cd were decreased by 13.47%~44.38% and 9.75%~42.20% at tillering stage and 8.72%~40.10% and 8.50%~45.79% at maturing stage, respectively. Applying HAP significantly lowered Pb concentrations in brown rice by 17.55%~88.74%, but increased Cd concentrations in brown rice by 45.63%~148.2%, as compared with the control. The transfer factor of Pb from stem to leaf at tillering stage and from stem to grain and from leaf to grain at mature stage was respectively 26.35%~71.62% and 28.42%~74.74% and 25.49%~82.35% lower in HAP treatments than in the control. However, Cd transfer factor from leaf to grain at mature stage was 48.78%~182.93% higher in HAP than in the control. Soil available Zn was also significantly decreased by HAP amendments. Our results indicate that evaluating the feasibility of amendments for immobilizing heavy metals in soils must consider not only their abilities to reduce the availability of soil heavy metals, but also their effects on the transfer of heavy metals within plant. |
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