首都圏・真間川の水質と流域の土地利用との関係

丁 長梅, 大森 博雄, 高村 弘毅

doi:10.4145/jahs.36.219

<p>Relationship between water quality represented by major inorganic ion concentrations and land use was discussed for the Mamagawa River which runs in the eastern part of the Tokyo Metropolitan Area. Principal component analysis for land use in the drainage basin yields 3 principal components. The first principal component expresses the degree of coverage with green, the second one indicates the degree of occupation by residential area, and the third one shows the degree of non-industrial development. The green area has a positive correlation with Ca²⁺, Mg²⁺ and NO₃^-, and a negative correlation with Na⁺, K⁺, Cl^-, EC, and TMI (Total Major Ions). It shows a weak negative correlation with SO₄^2- and HCO₃^-. Especially, the forest has a high positive correlation with NO₃^- due to chemical process of production of inorganic matter from humus. The agriculture area has also a high positive correlation with Ca²⁺, Mg²⁺ and NO₃^- due to fertilizer and soil conditioner. The residential area has a positive correlation with SO₄^2- and a negative one with NO₃^-. Sulfate ion, SO₄^2-, is originated from sulfuric salt in waste water in residential areas. Nitrate ion, NO₃^-, is considered to be decreased due to increase of the forest and agriculture areas which supply NO₃^-. Development of industrial area induces an increase in concentration of almost all ions. Water quality of the main stream changes at junctions with tributaries. The tributary with a different land use type from that of main stream strongly affects the water quality of main stream, because the water quality of the tributary is also different from that of the main stream.</p>

首都圏・真間川の水質と流域の土地利用との関係

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首都圏・真間川の水質と流域の土地利用との関係

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この論文をさがす

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収録刊行物

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