论文部分内容阅读
通过测定杉木人工林群落的生物量和各组分的热值 ,探讨了该群落净初级生产的能量积累和分布 .结果表明 :该群落能量现存量为 175 5 3× 10 8～ 15 485× 10 8J/hm2 ;各组分或器官的热值含量变化范围为 17.3 6～ 2 1.0 4k J/g,其中以花果、凋落物和叶的能量含量较高 ,树干居中 ,而树皮、根、枝的能量含量较少 ;不同组分或器官的能量现存量差异较大 ,其大小顺序为树干 >根 >叶 >枝>凋落物 >地被物地上部分 >地被物地下部分 ;群落地上部分与地下部分能量的比值为 4∶ 1,垂直层次中能量分布按由大到小的顺序排列为乔木层 >根系层 >凋落物 >地被物 ;群落能量现存量的间伐损失量一般随抚育间伐强度的增大而增加 ,当抚育间伐强度小于 5 0 %时 ,损失量一般不超过能量现存量的 1/3
The energy accumulation and distribution of net primary production of this community were discussed by measuring the biomass and the calorific value of each component in the Chinese fir plantation.The results showed that the energy stock of this community was 175 5 3 × 10 8 ~ 15 485 × 10 8J / hm2. The caloric value of each component or organ varied from 17.3 6 to 1.04 kJ / g, with higher energy content of flower, litter and leaves, The energy content of the branches is less; the energy existing amounts of the different components or organs vary greatly, and the order of their energy is the trunk> root> leaf> branch> litter> ground cover part> ground cover part; The ratio of energy to subsurface energy is 4: 1, and the energy distribution in vertical layers is in descending order of arbor layer> root layer> litter> ground cover; When the tending strength is less than 50%, the loss usually does not exceed 1/3 of the existing amount of energy