亚热带山地突脉青冈群落能量的研究

对突脉青冈（Ｃｙｃｌｏｂａｌａｎｏｐｓｉｓｅｌｅｖａｔｉｃｏｓｔａｔａ）群落植物体各组分的热值、群落能量现存量、能量年净固定量和太阳能转化效率的研究结果表明：该群落植物体各组分样品的干重热值具有一定差异，树皮热值最高，细根热值最低。突脉青同群落的能量现存量８５２０５８ｋＪｍ－２，其中地上部分７４１４１６ｋＪｍ－２，占总量的８７．０１％；地下部分１１０６４２ｋＪｍ－２，占１２．９９％。突脉青冈１９９６年群落能量净固定量为２８２７３ｋＪｍ－２，林地太阳光有效辐射能转化效率１．３５％。

THE ENERGY OF CYCLOBALANOPSIS ELEVATICOSTATA COMMUNITY IN SUBTROPICAL ZONE

Based on the measurement of biomass and the rate of its increase, caloric value ofrespective plant organs, energy of standing crop, annual net energy fixation and energyconversion efficiency in Cyclobalanopsis elevaticostata community in subtropical zone at950 m altitude in Fujian Province were determined in 1996. The results showed that thecaloric value of the bark was the highest and the microroot being the lowest among dryweight of plant organs in the community. Total energy of standing crop in the communitywas 852058 kJ m2, of which the aboveground part comprising 87.01%, and theunderground part 12.99%. Yearly net energy fixation was 28 273 kJ m, and energyconversion efficiency was 1 .35% for the community.