海南岛3种人工林树种地上生物量分配特征及区域差异

以海南岛7个市县分布的马占相思、橡胶和桉树人工林为研究对象,通过野外调查与室内分析,探讨了3种人工林树种的地上生物量分配特征及区域分布情况。结果表明:(1)3种人工林树种的地上总生物量分配比例基本遵循干材>树枝>树叶>干皮的模式,树干占绝对优势;(2)基于胸径大小一致,热带地区不同区域内人工林树种地上总生物量差异明显,其中马占相思地上总生物量范围在51.06～179.25 kg之间,白沙值最大,橡胶树地上总生物量范围在48.42～173.15 kg之间,陵水值最大,桉树地上总生物量范围在43.06～228.11 kg之间,儋州值最大;(3)同一树种在不同市县的生物量分配比例差距悬殊,其中马占相思树干生物量占地上生物量的48%～78%,橡胶树树干生物量占地上生物量的35%～78%,桉树树干生物量占地上生物量的48%～85%,树干生物量贡献力度越大其地上生物量会相应增加。本研究结果为热带地区人工林资源的合理经营和利用提供基础数据。

Aboveground Biomass Distribution Characteristics and Regional Differences of Three Artificial Plantation in Hainan Island

In this paper, the aboveground biomass allocation ratio and regional distribution of three species of plantation tree species (Acacia mangium, Hevea brasiliensis and Eucalyptus spp.) were investigated in seven cities and counties in Hainan Island. The proportion of aboveground total biomass allocation of the three species of plantations was basically followed by dry wood > branches > leaves > dry bark, and the trunk dominates. Based on the consistent diameter of breast diameter, the total biomass of plantation trees in different regions of the tropics was significantly different. The total biomass of A. mangium was between 51.06-179.25 kg, and the value in Baisha was the largest. The total biomass of H. brasiliensis was between 48.42-173.15 kg, the value in Lingshui was the largest. The total biomass of Eucalyptus spp. was between 43.06-228.11 kg, and the value in Danzhou was the largest. The proportion of biomass allocation in the same tree species in different cities and counties was very different. The trunk biomass of A. mangium, H. brasiliensis and Eucalyptus spp. was 48%-78%, 35%-78% and 48%-85% of the aboveground biomass respectively. Greater contribution of tree trunk biomass resulted in higher aboveground biomass. The results of this study would provide basic data for rational management of plantation resources in tropical areas.