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在群落生物生产力研究基础上，对天然三大硬阔林进行了热值测定，经分析计算，总结出天然三大硬阔林的能量特征：（１）植物热值随植物种类、器官、分布层次而发生变化；（２）群落中能量现存量为１８７１．４１９×１０９Ｊ·ｈｍ－２，乔木层能量现存量为１５８７．９２９×１０９Ｊ·ｈｍ－２，其中干材能量现存量占比例最大，为４６．０８％；（３）群落能量净固定量为１９８１．５３５×１０８Ｊ·ｈｍ－２·ａ－１，乔木层为１２９５．５１４×１０８Ｊ·ｈｍ－２·ａ－１，占６５．３８％；（４）群落净初级生产力为１９５．４２５×１０９Ｊ·ｈｍ－２·ａ－１，乔木层为１２５．０８８×１０９Ｊ·ｈｍ－２·ａ－１，占６４．０１％，灌木层和草本层各占３０．４６％和５．５４％。
Based on the study of community biological productivity, the calorific values of three broad hardwood forests were determined. After analysis and calculation, the energy characteristics of three natural hardwood forests were summarized as follows: (1) The calorific value of plants varied with plant species, organs, distribution (2) The existing amount of energy in the community is 1871.419 × 109J · hm-2, and the existing amount of energy in the tree layer is 1587.929 × 109J · hm-2, of which the dry matter energy is the largest, (46.08%). (3) The net fixed energy of the community was 1981.535 × 108J · hm-2 · a-1 and the tree layer was 1295.514 × 108J · hm-2 · a-1, accounting for 65.38 %; (4) The net primary productivity of the community was 195.425 × 109J · hm-2 · a-1, and the tree layer was 125.088 × 109J · hm-2 · a-1, accounting for 64.01% Herb layers each account for 30.46% and 5.54%.