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.
