참나무林과 松林土의 土壤 有機物의 分解에 미치는 溫度, 함수량, 土壤微生物의 影響 및 N, F, Ca, K, Mg 等의 施加에 依한 分解率의 變化를 硏究하였다. 그 結果는 다음과 같다. 1. 참나무와 松林土의 土壤有機物의 分解 溫度의 增減에 따라 현저한 영향을 받는다. 2. 分解에 必要한 最適 含水量은 참나무 林土에서는 L層 120%, F層 150%, H層 100%, A₁ 層 70%이며, 소나무에 있어서는 L層 80%, F層 90%, H層 60%, A₁層 80%였다. 3. 土壤 有機物의 分解는 土壤生物에 依하여 行하여지나 土壤 Bacteria 보다는 主로 Fungi에 依하여 더 많이 分解된다. 4. 참나무林과 소나무林의 土壤 有機物의 分解에 영향을 미치는 無機鹽類는 N, P, Mg이며, K와 Ca의 영향은 미약하다.

Choon K. Kim and Nam K. Chang; Effect of the soil micro-organisms, temperature, moisture content and mineral salts on the decay rate of soil organic matter. The aim of the present study is to investigate the effects of microbial population, temperature, moisture content and mineral salts such as N, P, K, Ca and Mg added to the top soil on the decay rates of soil organic matter. The decay rate of soil organic matter was estimated by the measurements of the amount of CO₂ evolved from the soil organic matter. The decay rate of oak and pine forest soils were accelerate with the increasing temperature. It was also increased by the increasing number of soil microbial population, and the activity of fungi was much stronger than bacteria for the decomposition of soil organic matter. The optimum moisture contents of L, F, H, and A₁ horizon of oak forest soil for the decay of soil organic matter were 120, 150, 100 and 70 percent, and that of pine forest soil were 80, 90, 60 and 40 percent respectively. Among the mineral salts added to the top soil, nitrogen, phosphorus and magnessium except Ca, K, N-P, K-P have powerful effect on the decomposition of soil organic matters in oak and pine forests.