秦岭林区主要乔、灌木种类能量背景值测定分析

Gross Caloric Values of Main Tree and Shrub Species in Qinling Forest Region

对秦岭林区１１种乔木树种各器官、２１种灌木的地上、地下部分及４种林分类型地被物的总干重热值测定表明：针叶树各器官的热值普遍高于阔叶树，尤以树干最为明显。同一树种不同器官的热值差异较大，硬阔叶树各器官中树干热值最高，而软阔叶树则以皮和枝条热值最高。灌木地上部分热值高于地下部分，不同种间地下部分差异小于地上部分，同属种间热值基本相同；

Gross caloric values of 11 kinds of trees and 21 kinds of shrubs, as well as 7 types of litters in Qinling forest region were determined.Organes of coniferous trees, especially stem,produced a higher caloric value than that of broad-leaved trees.There was a large difference in the gross caloric value between different organs of the same tree.The stems of hard broad-leaved trees released the highest calories, whereas the branch and bark of soft broad leaved trees were found to form the highest caloric energy. The gross caloric values in the same organ varied from trees to trees. The aboveground parts of shrubs contained more calories than their underground parts. No significant difference was found in the gross caloric value among shrub species of the same genus. The composition of trees (both conifer and broad-leaved forests)had no influence on the gross caloric values of the litter.