| 组配改良剂对稻田系统Pb、Cd和As生物有效性的协同调控 |
| 摘要点击 2842 全文点击 1089 投稿时间：2016-02-03 修订日期：2016-04-28 |
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| 中文关键词 组配改良剂 Pb/Cd/As 土壤 水稻 生物有效性 |
| 英文关键词 combined amendment Pb/Cd/As soil rice bioavailability |
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| 中文摘要 |
| 通过水稻盆栽种植试验，研究了两种组配改良剂LST（石灰石+海泡石+二氧化钛）和LSF（石灰石+海泡石+硫酸铁）在不同添加量（0、1、2、4、8、16 g·kg-1）下对水稻土壤Pb、Cd和As的生物有效性以及水稻吸收累积Pb、Cd和As的影响.结果表明：1与对照相比，组配改良剂LST和LSF均使土壤pH值上升，且与对照之间均存在显著差异（P<0.05）；两种组配改良剂相比，LST比LSF使土壤pH值上升得更多.2施用1~16 g·kg-1的LST和LSF使土壤中Pb、Cd和As的交换态含量分别降低16.8%~88.3%、22.4%~73.7%、2.25%~43.8%和20.2%~86.9%、20.7%~51.2%、18.0%~55.1%，均与对照之间存在显著差异.LST和LSF均能显著降低水稻植株对Pb、Cd和As的吸收.当LST和LSF施加量为16 g·kg-1时，糙米中Pb、Cd和As的含量最高分别降低了50.7%、64.7%、34.1%和40.7%、40.7%、36.2%.3水稻各部位对Pb和As 的转运能力为谷壳 >茎叶 >根系，对Cd的转运能力为谷壳>根系>茎叶，水稻中谷壳向糙米转运Pb、Cd和As的能力为Cd >As >Pb.4施加LST和LSF后，水稻糙米中Pb、Cd和As含量与土壤Pb、Cd和As交换态含量之间存在极显著的正相关关系，与土壤pH值之间存在显著的负相关关系. |
| 英文摘要 |
| This paper studied the effects of applying two combined amendments LST (limestone+meerschaum+titanium dioxide) and LSF (limestone+meerschaum+ferric sulfate) at different ratios of 0, 1, 2, 4, 8 and 16 g·kg-1 on bioavailability Pb, Cd and As in paddy soil and bioaccumulation in rice plants through a pot experiment planting rice. The results indicated that: 1Compared with the control, applying LST and LSF could both significantly increase soil pH values (P<0.05), and LST increased the soil pH values more. 2Applying combined amendments LST and LSF with the amount of 1-16 g·kg-1 decreased exchangeable contents of soil Pb, Cd and As significantly by 16.8%-88.3%, 22.4%-73.7%, 2.25%-43.8%, and 20.2%-86.9%, 20.7%-51.2%, 18.0%-55.1%, respectively. LST and LSF significantly decreased contents of Pb, Cd and As of rice root, shoot, husk and brown rice. When the applying amount of LST and LSF was 16 g·kg-1, the contents of Pb, Cd and As in brown rice decreased by 50.7%, 64.7%, 34.1%, and 40.7%, 40.7%, 36.2%, respectively. 3The ability of rice organs transferring Pb and As was husk>rice straw>root, and that transferring Cd was husk >root >rice straw. The ability to transfer Pb, Cd and As from rice straw to brown rice was Cd >As >Pb. 4After applying LST and LSF, a significant positive relationship was observed between contents of Pb, Cd and As in brown rice and exchangeable contents of these elements in soil. Between contents of Pb, Cd and As in brown rice and soil pH values, there was a significant negative correlation. |
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