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Utilization of Alkaline-oxygen Delignification Stage Waste Liquor for the Removal of Aluminum Toxicity to Plant Growth

利用碱氧脱木素阶段废液去除铝对植物生长的毒害

基本信息

批准号：
15201016
负责人：
MESHITSUKA Gyosuke
金额：
$ 24.29万
依托单位：
THE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15201016/
关键词：
lignin soil conditioning agent aluminum ion forest acid soil alkaline-oxygen oxidation complex formation root

项目摘要

Quite a large area on the earth is covered by the so-called damaged soil, particularly by acid soil, on which plant growth is generally limited. This is partly due the low pH of soil water in those area, but is mainly due to the high aluminum ion concentration in the soil water. We have been working to develop the new soil conditioning agents from industrial lignins by a partial oxidation and have reported that the partially oxidized lignin is quite effective to remove aluminum toxicity to plant. In this study, chemical characteristics of lignin fragments in the alkaline-oxygen stage waste liquor and their functions to aluminum toxicity were carefully investigated. It was found that the lignin fragments as a whole and its high molecular weight fraction showed the positive effect to move aluminum toxicity, but the lower molecular weight fractions showed different behaviors dependent on the molecular weight. A fraction containing a lot of oxalic acid showed positive effect in the case of a lower dosage, but with an increased dosage it showed a clear negative effect for the removal of aluminum toxicity. This behavior can be explained by the complex formation between oxalic acid and aluminum ion which was confirmed by 27AL-NMR spectroscopy. Free oxalic acid itself is toxic to the plant growth.

地球上相当大的面积被所谓的受损土壤覆盖，特别是酸性土壤，其上植物的生长通常受到限制。这部分是由于该地区土壤水的pH值较低，但主要是由于土壤水中铝离子浓度较高。我们一直致力于通过部分氧化工业木质素来开发新型土壤改良剂，并报道部分氧化木质素对于消除铝对植物的毒性非常有效。在这项研究中，仔细研究了碱氧阶段废液中木质素碎片的化学特性及其对铝毒性的作用。结果发现，木质素碎片作为一个整体及其高分子量部分显示出消除铝毒性的积极作用，但较低分子量部分根据分子量表现出不同的行为。含有大量草酸的级分在较低剂量的情况下表现出积极的效果，但随着剂量的增加，它对去除铝毒性表现出明显的负面效果。这种行为可以通过草酸和铝离子之间形成络合物来解释，27AL-NMR 光谱证实了这一点。游离草酸本身对植物生长有毒。