人工酸性雨가 몇 樹種의 種子發芽와 苗木生長에 미치는 影響

Abstract

Artificial acid rain (pH 2,3,4, and 5) was treated on the seeds of six woody species to examine its effects on germination and seedling growth. Artificial acid rain was prepared by diluting sulfuric acid and nitric acid (H2S04 : HN03=3 : 1, v/v) with water and water (pH 6.4) was also used as control. Acid rain was sprayed to seeded pots three times per week. About 5mm of acid rain was treated each time from April 12th to August Nth, 1986. Germination, seedling establishment and seedling growth were measured and compared among the treatments. The results were summarized as follows: 1. No germination was observed from the pots treated with pH 2.0. 2. Germination and seedling establishment rate of Ilex crenata were the highest from the pot treated with pH 3.0 whereas those of Schizandra nigra the best from the pot treated with pH4.O. The pH 5.0 treatment showed the highest value in other species. 3. Zlex crenata, Magnolia sieboldii, Amorpha fruticosa and Diospyros lotus appeared less sensitive in seed germination and seedling establishment when acid rain (pH 3.0 or higher) was treated, whereas Magnolia kobus was more sensitive. 4. The differences in seedling height growth of Magnolia sieboldii, Zlex crenata and Diospyros lotus were significant at the 1% level among the treatment levels of acid rain, whereas those in Magnolia kobus and Amorpha fruticosa were not significant. 5. Seedling dry weights of Magnolia sieboldii differed significantly at the 1% level among the treatment and those of Magnolia kobus and Amorpha fruticosa at the 5% level. However, those of Zlex crenata and Diospyros lotus did not at the 5% level. . 6. Significant differences in top dry weight of Magnolia kobus, in root dry weight of Magnolia sieboldii, and in both top and root dry weights of Amorpha fruticosa were found among the treatment levels of acid rain.