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采用固定样方调查法对广西南宁地区尾巨桉无性系DH32-28第二代高产林生物量和生产力进行研究,结果表明:林分生物量为132.749t/hm~2,地上、地下部分生物量分别为106.930、25.181t/hm~2。生物量在不同器官之间的分配大小依次为:树干>根兜>树枝>粗根>树叶>中根>细根,树干生物量最大,占林分总生物量的74.98%。高产林分生产力为24.766t/hm~2·a,生产力分配格局与生物量分配格局基本一致,林分生产力主要集中在平均胸径以上的径阶,合计19.505t/hm~2·a,占林分总生产力的78.76%。不同径阶林木生物量增长率差异显著,11cm以下、11~13cm、14cm以上增长率分别为5~10%、15%、20~30%。说明林分生物量增长率与林分生物量分配格局无关,而与林木所处林分中的优势度有关。
The biomass and productivity of second-generation high-yield forest of Eucalyptus urophylla × E. grandis clones in Nanning, Guangxi were studied by using a fixed quadrat method. The results showed that the stand biomass was 132.749 t / hm ~ 2, The quantities were 106.930 and 25.181 t / hm ~ 2 respectively. The order of biomass allocation among different organs was as follows: trunk> root pocket> tree branch> coarse root> leaf> middle root> fine root, trunk had the largest biomass, accounting for 74.98% of the total biomass of stand. The productivity of high-yield stands was 24.766 t / hm ~ 2 · a, and the distribution pattern of productivity was consistent with the pattern of biomass allocation. The productivity of stands mainly concentrated on the diameter above the average diameter at breast height, totaling 19.505t / hm ~ 2 · a, 78.76% of total productivity. The growth rate of biomass of forest stands with different diameter was significantly different. The growth rates of biomass under 11 cm, 11 ~ 13 cm and 14 cm were 5 ~ 10%, 15% and 20 ~ 30% respectively. The results showed that the biomass growth rate of stands was not related to the distribution pattern of stand biomass, but was related to the dominance in the stand of forest.