南亚热带不同树种人工林生物量及其分配格局

通过收获法和建立的单木相对生长方程研究了南亚热带5种树种人工林乔、灌、草不同组分的生物量及其分配。结果表明:在立地条件相似,林龄和经营管理措施相同的情况下,不同树种人工林生物量有较大差异,表现为米老排林(404.95 t·hm-2)火力楠林(376.61 t·hm-2)马尾松林(239.94 t·hm-2)红椎林(231.01 t·hm-2)铁力木林(181.06 t·hm-2)。林分生物量空间分布格局以乔木层为主,占总生物量的87.71%97.86%;其次为地表凋落物层,占1.96%10.90%;灌木层和草本层最低,仅占0.02%1.09%。林分乔木层各器官的生物量分配格局总体呈树干生物量所占比例最大,根或枝所占比例次之,再其次是干皮,叶生物量最低。林下灌木层、草本层和地表凋落物层生物量在不同林分间的差异均较大,其中,灌木层生物量以红椎林和马尾松林较高,火力楠林和米老排林较低,铁力木林最低;草本层和地表凋落物层表现出相似的规律,即马尾松林最高,红椎林其次,米老排林、火力楠林和铁力木林较低。

Biomass Allocation of Different Species Plantations in Subtropical Area of China

The allocation patterns of biomass in five plantations were studied by harvesting method and established allometric equations in subtropical area of south China. The results showed that the biomass of different species plantations were quite different in the same circumstances such as similar site conditions, age and management measures, showing that Mytilaria laosensis stand (404.95 t·hm^-2) > Michelia macclurei stand (376.61 t·hm^-2) > Pinus massoniana stand (239.94 t·hm^-2) > Castanopsis hystrix stand (231.01 t·hm^-2) > Mesua ferrea stand (181.06 t·hm^-2). The biomass spatial pattern dominated by tree layer, which accounted for 87.71%-97.86%, followed by the litter layer, accounting for 1.96%-10.90%, shrub and herb layers were the minimum, accounting for only 0.02%-1.09%. The organ biomass pattern of tree layer showed that proportion of stem biomass was the largest, followed by the root's or branch's, and then followed by the bark's, the lowest was the leaf's overall. The biomasses of shrub layer, herb layer, and floor litter among different stands were quite different. C. hystrix stand and P. massoniana stand had higher biomass of shrub layer, Mytilaria laosensis stand and Michelia macclurei stand were lower, Mesua ferrea stand was the lowest. The biomasses of herb layer and floor litter showed a similar law, that of P. massoniana stand was the highest, C. hystrix secondly, Mytilaria laosensis stand, Michelia macclurei stand and Mesua ferrea stand were lower.