1.1 第1講義地球環境を育む土壌(自然と環境,平成18年度石川県立大学公開講座)

概要

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Soils store the nutrients (essential elements) which are necessary for the plant growth. Plants uptake the nutrients adsorbed on the clay and humic substances (soil organic matters). The content of the clay and humic substances in the soil is an indication of the soil fertility. Humic substances are hardly decomposed by a microorganism. But, because they finally decompose and disappear, we furnish organic substances, and maintain the contents of humic substances in the soil. When large quantities of organic substances is given to soils for a long time, the content of humic substances becomes very excessive, and iron, cupper, and/or manganese are chelated (fixed) on humic substances, and plants can not uptake them any more. This leads to the crops with insufficient for essential elements of human being. When hazardous heavy metals and organic pollutants in the waste from homes and businesses are released in the environment, groundwater is polluted directly without an interaction between the soils and these hazardous materials. Cupper, lead, and cadmium are chelated (fixed) on humic substances in soils, and it is difficult to remove them. Most of the organic pollutants are hardly decomposed by micro-organisms and it is hydrophobic compounds which adsorbs on humic substances with hydrophobic interactions.
石川県立大学の論文
2007-03-31