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通过对鹤山马占相思 (Acacia mangium)人工林的群落结构、生物量、净初级生产力的研究表明 ,15龄的马占相思人工林乔木层总生物量为 196 .94t.hm- 2 ,其中树干为 80 .75 t.hm- 2 ,树枝为 5 5 .14t.hm- 2 ,树叶为 19.6 9t.hm- 2 ,根为 41.36 t.hm- 2 。该人工林 1～ 7龄生物量增长迅速 ,而 7～ 11龄的生物量增长则相对较慢 ,11龄后生物量趋稳。11龄马占相思林的净初级生产力约为 10 .6 6 t.hm- 2 .a- 1 。马占相思是一个速生的树种 ,在 11龄以前适合作南亚热带的先锋树种 ,11龄后可在乔木层和灌草层间的空隙层间种阴生树种或中生性树种进行改造。
Through the study on the community structure, biomass and net primary productivity of Acacia mangium plantations, the total biomass of arbor layer in the 15-year-old Acacia mangium plantation was 196.94t.hm-2, in which the trunk Was 80.75 t.hm-2, the branch was 55.14t.hm-2, the leaf was 19.69t.hm-2, and the root was 41.36 t.hm-2. The biomass of 1 ~ 7 years old increased rapidly in the plantation, while the growth of biomass in 7 ~ 11 years old was relatively slow. After 11 years, the biomass was steady. The net primary productivity of 11-year-old Acacia mangium forest is about 10.66 t · hm -2 · a -1. Acacia mangium is a fast-growing tree species, suitable as a pioneer tree species in the South Subtropical Zone before the 11th instar. After eleven years, the species can be reformed in the interstitial layer of arborous layer and shrub layer.