Neutralization Effects of Acidity of Rain by Cover Plants on Slope Land

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  • Adachi Tadashi
    Faculty of Environmental Science and Technology, Okayama University
  • Oki Yoko
    Faculty of Environmental Science and Technology, Okayama University
  • Nagai Akihiro
    Faculty of Environmental Science and Technology, Okayama University
  • Nakatsukasa Shogo
    The Graduate School of Natural Science and Technology, Okayama University

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  • 法面被覆植物による酸性雨中和能の可能性
  • ノリメン ヒフク ショクブツ ニ ヨル サンセイウ チュウワノウ ノ カノウセイ

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Abstract

Neutralization effects of acidity of rain were examined by cover plants on slope land. Slope gradient was 10 degrees. Cynodon dactylon Pers, Dichondr a repens Forst and Artemisia princes Pampan were selected as cover plants. The pH value of rain less than pH 5.6 was observed 10 times among 13 times of sampling, and it was ranged from 4.39 to 5.92. The main results of this experiment were as follows : ①The pH value of surface runoff increased than that of each rain. The average value of [H+] of surface runoff was a value from which 47% of [H+」of rain was subtracted. This means that cover plants have the neutralization effects of acid rain. ②The neutralization capability of acid rain was explained that cation leached from the leaf parts of cover plants has played the role of counteractive. ③There was the difference in the pH value of surface runoff between Atremisa princes and Cynodon dactylon. Therefore it was shown that the neutralization effects of acid rain of Atremisa princes was larger than that of Cynodon dactylon.

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