昆明地区元江栲萌生灌木群落生物量的研究

A STUDY ON BIOMASS OF CASTANOPSIS ORTHACANTHA SPROUTED SHRUB COMMUNITY IN KUNMING REGION

本文应用收获法和维量分析法相结合,对昆明地区元江栲萌生灌木群落地上部分生物量的研究,着重对群落主要优势种地上部分生物量的径级分布、枝叶器官分布、群落的层次分布和植物种类生物量分布规律等的研究。其结果如下;1.元江栲萌生灌木群落优势种地上部分的生物量为24.56吨/公顷。其径级分布规律是;径级小的萌枝数量较多,生物量较小;径级大的萌枝数量较少,但生物量较大,而且占绝对优势。其器官生物量的分布规律为;随着林木的发育,叶、枝比越来越小,并且叶的生物量渐趋一定值,而萌枝木质部分的生物量不断增加。2.元江栲萌生灌木群落地上部分的总生物量为31吨/公顷,总生物量的层次分布规律是;灌木Ⅰ层即由优势种形成的层的生物量占绝对优势,而灌木Ⅱ层和草木层的生物量都很小。3.同一类型萌生灌木群落,只要其年龄相近,结构相似,种类组成相似,就可以用同一种模式来推算它的生物量。

By means of combining harvest method with the method of dimension analysis,this paper studies the biomass of Castanopsis orthacantha sprouted shrub community above the ground in Kunming region.The authors concen- trate on their study on the biomass of dominant species of the community above the ground,the law of biomass distribution of diameter class and organ,the gross biomass of this kind of communinty,and the law of gross biomass dis- tribution of layer and specis.The results are as follows. 1.The biomass of a kind of community can be calculated by the same model when its age is close to each other,and its structure and species com- position are similar. 2.The biomass of dominant species of Castanopsis orthacantha sprouted shrub community is 24.56t./ha..The law of diameter class distribution of it is as follows.The more the number of thin branches(1≤d<2cm)is,the less its biomass is.The fewer the number of thick branches(d≥3cm)is, the more its biomass is and this occupies an absolute dominant position.The law of distribution of organ biomass is as follows.The proportion of biomass of leaves and wood gets smaller and smaller and the leaves'biomass tends to be a fixed weight,but the wood's biomass increases constantly. 3.The gross biomass of Castanopsis orthacantha sprouted shrub commu- nity is 31t./ha.and the law of distribution of layer biomass is as follows.The biomass of dominant layer or first shrub layer occupies a dominant position absoluty but the biomass of second shrub layer and herbaceous layer is very little.