关键词: 森林土壤, 生化特性, 土壤酶, 武夷山, 烟草, 光合产物, 光环境, ¹³C, 光合特性

Abstract: Studies on the biochemical characters of forest soils in Wuyishan Mt. Natural Reserve show that the rates of soil respiration, cellular decomposition and nitrification differed obviously with habitats. Soils under broad leaved evergreen forest (Castanopsis eyrei) at Xianfengling had higher rates than those under moso bamboo forest (Phyllostachys heterocyca var. pubescens) at Dazhulan. The three rates at each habitat also significantly differed with microhabitats: for respiration rate, litter layer>humus layer>soil layer; and for nitrification rate, soil layer>litter layer>humus layer; for cellular decomposition rate, humus layer>litter layer>soil layer. Among the three rates at each hibitat, there existed a definite relationship between respiration rate and cellular decomposition rate, while the nitrification rate was independent of the other two. The activities of sucrase, celluase and proteinase varied with different habitats, which were higher at Dazhulan than at Xianfengling, and decreased with increasing soil depth. Among the three enzymes, sucrase had the highest activity at all microhabitats, and the variation of its activity was greater.

Key words: Forest soil, Biochemical character, Soil enzyme, Wuyishan Mt, ¹³C, light environment, photosynthetic characteristics, photosynthetic products, flue-cured tobacco