Effects of Artificial Acid Rain on Seed Germination, Growth and Needle of Several Conifers(1)

인공산성우가 몇 침엽수종의 종자발아, 생장 및 침엽에 미치는 영향(1)

Artificial acid rain (pH 3.0, 4.0 and 5.0) was treated on the seeded pots of 4 species to examine its effects on germination, leaf injury and seedling growth. Artificial acid rain was prepared by diluting sulfuric acid with ground water and ground water (pH 6.5) was used as control. Artificial acid rain was sprayed to seeded pots three times per week. About 5mm of artificial acid rain was treated each time from early April to early October, 1991. Germination, seedling establishment, leaf injury, soil acidity and seedling growth were measured and compared among the treatments. The results were summarized as follows; 1. Germination and seedling establishment rate of Pinus thunbergiana was highest on the pH 4.0 pot whereas that of Picea abies was highest on the pH 3.0 pot. Those of Pinus densiflora and Abies holophylla were not significantly differed among the treatments. 2. The differences in seedling height of all species were not significantly differed among the treatments. 3. Seedling dry weight of Pinus densiflora differed significantly among the treatments. but that of Pinus thunbergiana did not differ. 4. With decrease of pH value of artificial acid rain. the number of injured needle and injured individual tended to be increased. 5. The differences of soil acidity were significant among the treatments for all species.

인위적으로 산도를 조절한 인공산성우처리가 4수종의 종자발아와 생장, 잎의 피해, 묘목생장에 미치는 영향을 알아보고자, 혼합토양을 채운 pot에 종자를 파종하고, 황산을 지하수로 묽힌 pH 3.0, 4.0 및 5.0의 인공산성우를 처리하면서 종자발아율, 엽피해율, 토양산도 및 묘목생장을 측정하여 처리간 비교분석한 결과는 다음과 같다. 1. 곰솔은 PH 4.0 처리구에서, 독일가문비는 pH 3.0 처리구에서 각각 발아 및 득묘율이 가장 높았고, 소나무와 젓나무에서는 처리간 유의차가 없었다. 2. 묘고생장에 있어서 모든 수종에서 처리간통계적 유의성이 인정되지 않았다. 3. 개체당 건중량에서 소나무에서는 처리간 통계적 유의차가 인정되었으나, 곰솔에서는 통계적 유의차가 인정되지 않았다. 4. 처리산성우의 pH값이 작아질수로 피해엽수 및 피해개체수가 증가하는 경향이었다. 5. 토양산도는 대체로 모든 수종에서 처리간 통계적 유의차가 인정되었다.