| 含磷物质对水稻吸收土壤砷的影响 |
| 摘要点击 3071 全文点击 1515 投稿时间：2013-10-17 修订日期：2014-04-14 |
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| 中文关键词 含磷物质 砷 水稻 污染土壤 拮抗作用 |
| 英文关键词 phosphorus-containing substances arsenic rice contaminated soil antagonism |
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| 中文摘要 |
| 向砷（As）污染土壤中施用磷酸氢二钠（DSP）和羟基磷灰石（HAP），通过水稻盆栽试验研究含磷物质对水稻吸收土壤砷的影响. 结果表明，DSP和HAP都显著增加了土壤pH值和土壤有效磷含量（P<0.05），活化了土壤中的砷，且DSP提高砷在土壤迁移的能力要强于HAP. DSP和HAP均使水稻根中总砷、 糙米总砷、 糙米无机砷含量显著降低，但HAP显著增加了水稻茎叶总砷含量. DSP和HAP降低糙米中无机砷的效果比总砷略好，DSP降低糙米中总砷和无机砷的效果与HAP基本相当. 分析表明，水稻各器官中砷含量受磷砷拮抗作用和土壤中砷生物有效性增加这2个因素的影响，且在本试验条件下磷砷的拮抗作用在水稻根、 糙米这两个部位中有明显体现. 较低添加量（小于等于0.12 g·kg-1）的DSP和HAP使水稻总生物量和糙米产量有所增加，但随着添加量的继续增加，2种含磷物质明显抑制了水稻生长，且HAP的抑制作用相对较轻. |
| 英文摘要 |
| The disodium hydrogen phosphate (DSP) and hydroxyapatite (HAP) were added into arsenic contaminated soil, then rice pot experiment was conducted to study the effects of phosphorus (P)-containing substances on arsenic (As) uptake by rice. The results showed that: DSP and HAP significantly increased soil pH and the contents of available P in soil (P<0.05), activating soil arsenic. And DSP was stronger than HAP in improving the migration ability of As in soil. DSP and HAP treatments both significantly reduced the contents of total As in root, as well as total As and inorganic As in brown rice. But HAP significantly increased total As contents in stem. DSP and HAP treatments had better reducing effects on inorganic As than on total As in brown rice. And DSP had the same reducing effects as HAP on total As and inorganic As in brown rice. Analysis results showed that the contents of As in rice were affected by the antagonism between P and As and the increase of As bio-availability in soil. The antagonism played the major role in this study and it was clearly exhibited in both root and rice. Lower dosage (≤0.12 g·kg-1) of DSP and HAP increased total biomass of rice and brown rice yield, but with the increase of P addition, the two kinds of P-containing substances obviously inhibited the growth of rice, and inhibition by HAP was relatively light. |
