| 硅对酸性土壤铝毒的缓解作用 |
| 摘要点击 894 全文点击 1437 投稿时间：1995-06-12 |
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| 中文关键词 硅 酸性土壤 小麦铝毒 根际培养 |
| 英文关键词 silicon acid soil aluminum toxicity alleviating effect wheat rhizosphere |
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| 中文摘要 |
| 铝毒是酸性上壤限制作物生长的主要因素,寻找缓解甚至消除土壤铝毒的措施是合理开发利用酸性土壤、提高作物产量的重要途径。本试验选取湖北温泉第四纪母质发育的酸性红壤(pH值4.8),作了加硅处理的小麦土培和根际培养试验,测定了麦苗植株生长量、部分矿质元素含量以及根际土壤活性铝的含量。结果表明,加硅0.3mmol/kg即可促进麦苗根系对钙、镁等元素的吸收,增加植株的生长量。硅加入量达到0.9mmol/kg时,对麦苗生长和矿质养分吸收的促进作用更加明显。加硅处理还在一定程度上减缓了麦苗根际土壤pH值下降和活性铝增长的幅度。本文讨论了酸性土壤上施用含硅物料缓解铝毒的作用及其应用的前景。 |
| 英文摘要 |
| Pot culture experiments were carried out to study the effect of silicon application in acidic soil on the alleviation of aluminum toxicity to wheat. Silicon was added as solutions of sodium slilicate with a pH value of 4.8 and the unamended soil was used as control. Plant biomass and contents of some elements in wheat seedlings were measured. The concentrations of some species of active aluminum in rhizosphere soils were also determined. It was found that the biomass of wheat seedlings increased and the uptake of Ca,Mg etc. by wheat seedlings was. improved with 0.3 mmol/kg of Siadded. When the amount of Si added reached 0.9mmol/kg,more significant effects can be observed for the growth and uptake of nutrients by wheat seedlings. Moreover,silicon tretments slowed down the pH decline and the increment of soluble and exchangeable aluminum content in rhizosphere soils. Considering the resources and the effects for mitigating aluminum toxicity,application prospect of silicon materials such as some industrial waste products and crop residues in acid soils were discussed. |
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