天然三大硬阔林能量结构的研究

STUDY ON THE ENERGY STRUCTURE OF NATURAL HARDWOOD FORESTS

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 studies of productivity of community. energy structure of natural hardwood forests was studied by measuring caloric values.The results are as follows:(1) Caloric content of plant samples varies with species,organs and distributive layers.(2) Standing community energy accumulated is 1871×109 J. hm-2 tree layer is 1587. 929×109J. hm-2, the most part is the trunk, with 46. 08%.(3) Net energy production of community is 1981.535 ×108·hm-2·a-1,tree layer is 1295.514×108J·hm-2.a-1, with 65.38%.(4) Net primary productivity increase of community is 195.425×109J·hm-2·a-1,tree layer is 125.088×108J·hm-2·a-1,with 64.01%,shrubs and herbs are 30.46% and 5.54%.