| 唐守寅,董海霞,赵明柳,李荭荭,王果.羟基磷灰石对铅、镉在土壤-水稻体系中吸收和转移的影响[J].农业环境科学学报,2016,35(2):266-273. |
| 羟基磷灰石对铅、镉在土壤-水稻体系中吸收和转移的影响 |
| Effects of hydroxyapatite on absorption and transfer of Pb and Cd in soil-rice system |
| 投稿时间：2015-09-20 |
| DOI：10.11654/jaes.2016.02.009 |
| 中文关键词: 羟基磷灰石 水稻 重金属 吸收 转移 |
| 英文关键词: hydroxyapatite rice heavy metals absorption transfer |
| 基金项目:国家自然科学基金促进海峡两岸科技合作联合基金(u1305232) |
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| 中文摘要: |
| 为研究羟基磷灰石(HAP)对Pb、Cd在土壤-水稻系统中转移的影响,在Cd-Pb-Zn复合污染的土壤中施用不同用量(0、2、4、8、16、32 g·kg-1)的羟基磷灰石,进行了水稻的盆栽试验。结果表明,施用HAP显著提高了土壤pH,使水稻分蘖期和成熟期土壤中有效Pb含量分别降低13.47%耀44.38%和8.72%耀40.10%,使有效Cd含量分别降低9.75%耀42.20%和8.50%耀45.79%;施用HAP使宜优673糙米Pb含量降低了17.55%耀88.74%,但使糙米Cd含量增加了45.63%耀148.2%;施用HAP使分蘖期从茎到叶、成熟期从茎到糙米、成熟期从叶到糙米Pb的转移系数分别降低26.35%耀71.62%、28.42%耀74.74%和25.49%耀82.35%,但使成熟期Cd从叶到糙米的转移系数增加了48.78%耀182.93%。另外,施用HAP后土壤有效Zn含量也有所降低。以上结果说明,HAP通过降低土壤中Pb的有效性和抑制分蘖期Pb从茎到叶及成熟期从茎和叶到糙米的转移能力来降低籽粒中Pb的富集;HAP虽可以显著降低土壤中Cd的有效性,但成熟期Cd从叶到糙米转移能力的增强以及Cd、Zn之间可能的交互作用导致了籽粒中Cd的增加。因此,评价土壤重金属钝化剂的效果时不仅要考虑其对土壤重金属的钝化效果,也要考虑其对重金属在植物体内转移和分配的影响。 |
| 英文摘要: |
| 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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