Fundamental Study on Effective Utilization of Forestry and Wood Industry Wastes

每年都会产生大量的sugi和hinoki树皮，但最近立法禁止焚烧它们。因此，林业和木材工业很难处理它们，正在寻找新的利用途径。它们的用途之一是用于农业用途，如堆肥、盆栽基质、地膜等，但这些树皮中含有的一些抽出物已被认为是阻碍植物生长的物质。我们已经阐明了树皮中的水抽出物或甲醇抽出物的量在样品之间存在很大差异，并与植物生长抑制密切相关。黄瓜和茄子种子被用于这些实验。它们被萌发并生长在湿脱脂棉花上，其中含有培养皿中的每种萃取物。随着浸出物含量的增加，生长速率明显下降，尤其是内树皮中的浸出物含量明显丰富，且对树皮生长的影响大于外树皮。Sugi和Hinoki树皮提取物之间的差异不大。较高摩尔的酚类物质似乎是主要原因，因此，如果降低这些酚的溶解度，这些问题就会得到缓解。添加明胶或阳离子聚合物能显著减轻植物生长抑制，而多种水溶性聚合物也能有效地解决这些问题。

A large quantity of sugi and hinoki barks is generated every year, but their incineration has recently been prohibited by legislation. Therefore forest and lumber industries are in difficulty to dispose them and are searching new utilization. One of their promising usage is for the agricultural ones, e.g. compost, pot medium, mulch etc. but some extractives contained in these barks have been known to impede the growth of plants.We have elucidated the quantities of water extractives or methanol extractives from the barks were largely different from sample to sample and were closely related to the plant growth inhibition. Cucumber and egg plant seeds were used for these experiments. They were germinated and grown on wet absorbent cotton containing each extractive in the Petri dish. The growth rate was apparently decreased according to increase of the extractives, especially the inner bark was markedly abundant in the extractives and influenced more than the outer bark. There was little difference between sugi and hinoki bark extractives. Higher molar phenolic substances seem to be main cause, therefore these problems assuem to be alleviated if the solubility of such phenols is lowered. Addition of gelatin or cationic polymers was found to dramatically reduce the plant growth inhibition and many kinds of water-soluble polymers were also effective to solve these problem.