关键词: 杉木人工林, 干重热值, 生物量, 能量

Abstract: The energy storage and its distribution in Chinese fir plantations was comparatively studied at Huitong and Zhuting of Hunan Province respectively．The former is in the 0-riginal distribution centre of Chinese fir，the latter is in its enlarged planting areas．The results showed that the energy fixed by the 11—year—old stand at Huitong is 16833×10⁸J/hm²,while only 11381×10⁸J/hm² at Zhuting；Energy distribution in the forest com- ponents is in the following order；stem>root>leaf>branch．Energy stored in stem at Huitong is larger than that at Zhuting，but energy in branch and leaf at Huitong is less than that at Zhuting．The energy fixed by the stand decreased with its density increas-ing，the energy decrease occurred mostly in the stem’s accumulation．The energy vertical distribution of the forest showed that the soil surface layer and 2/3 canopy height take up most of the energy．It indicated that in an ecosystem，where most energy flows to and accumulated in the place where nutrients and water are most needed．In Zhuting stand，the economic value of energy fixed by photosynthesis(of stem) is 20％ less than that in Huitong，and the photosynthetic ability of leaf and branch is only 70％ that of the latter．

Key words: Chinese fir plantation, Thermal value of dry weight, Biomass, Energy