长穗高山栎萌生灌丛地上部分生物量及净初级生产量的研究

Studies on the Aboveground Biomass and the Net Primary of Quercus Longispica Sprouted Shrub Community

本文研究了昆明地区生长于石灰岩山地上的长穗高山栋萌生灌丛的地上部分生物量、净初级生产量及其萌生生长的特点.群落地上部分的生物量和净初级生产量因年龄、生境条件的不同有所变化.昆明地区4,5年生的长穗高山栎萌生灌丛地上部分的平均生物量和净初级生产量为11.86 t/hm^2和 4.09 t/hm^2.长穗高山栎遭砍伐后能很快萌生出大量新萌枝,第1,2年高生长显著,在以后的生长中多数萌枝将被淘汰,生长速度逐渐降低.

A Quercus longispiea sprouted shrub community is developed from Us forest which was cut off in limestone area. The percentage of the biomass of Quercus longispica, which is the dominant species, is over 90% of the biomass of the community above ground. The aboverground biomass of the community and the distribution of the layer biomass is varied in various area. The average aboverground biomass of the community is about 11.8 t hm2. in Kunming area. The net primary production of sprouted shrub community connot be calculated by the same model in various associations. The net primary production of 4 and 5-year-old Quercus Longispila sprouted shrub community is 4.09 t / hm2·a. in kunming aera. A lot of new branches sprouts from stubs of Quercus longispica which old branches were cut off. At first height increments of new sproutsois fast, then slowwer and slowwer, after 4year it is constant. Diameter increments of new sprouts is constant. On the othcrhand intensity of growth of evenaged sprouts on the same stub is differet.