【摘要】 通过对水曲柳(Fraxinus mandshurica)天然次生林的生物量和热值的测定,研究了其能量结构。结果如下:(1)水曲柳天然次生林乔木层平均热值最高,为17.9704KJ/g;下木层居中,为17.4422KJ/g;草本层最低,为16.5216KJ/g。乔木层中木质器官(干材、干皮、枝、根)热值大于叶的热值,而各木质器官之间差异不大。(2)林龄为43a的水曲柳天然次生林,乔木层能量现存量为31.59×10~8KJ/ha,其中干材能量现存量占比例最大,叶最低。(3)林龄为43a的水曲柳天然次生林能量净初级平均生长量为96.57×10~6KJ/ha·a,近5a能量净初级平均生长量为170.25×10~6KJ/ha·a。平均光能利用率为0.42％,近5a平均光能利用率为5.74％。净初级生产力和光能利用率都随林龄增大而增加。更多还原

【Abstract】 The energy structure of manchurian ash (Fraxinus mandshurica) natural secondary forest was studied as follows by measuring the biomass and caloric values,(1) The order of average caloric values is: tree layer (117.9704KJ/g), shrub layer (17.4422KJ/g), herb layer (16.5216KJ/g). The caloric values of woody organs such as trunk, branches and roots in tree layer are higher than that of leaves, but the difference between these organs is not significant. (2) As for this 43 years old forest, the standing energy of tree layer is 31.59×10~3KJ/ha, the most part is in the trunk and the smallest is in the leaf. (3) The general and recent 5-year average annual net primary productivity in energy is 96.57×10~6KJ/ha.a and 170.25x10~6KJ/ha·a respectively, thus both of their solar utilization ratio is 0.42％ and 0.74％ respectively, and both of the ratios and the net primary productivity lucrease with the forest growing.更多还原