麻栎人工林生态系统碳储量分配格局

Carbon storage and distribution pattern of Quercus acutissima plantation ecosystem

【目的】探讨广西南宁良风江32年生麻栎人工纯林生态系统的生物量、碳密度、碳储量及其空间分配特征,为提高广西地区碳储量提供参考依据。【方法】在麻栎人工林内选择标准样地,用收获法测定生态系统的生物量,用重铬酸钾—外热法测定麻栎各器官的碳素含量,并用环刀法测定土壤碳密度。【结果】麻栎人工林各器官的碳素含量为：干材〉叶〉皮〉根兜〉枝〉细根〉中根〉粗根。土壤碳含量以0-20 cm土层最高,且随土层深度的增加而降低。麻栎人工林生态系统的总生物量为241.08 t/ha,其中乔木层占97.90%,林下植被层占0.54%,凋落物层占1.56%。【结论】麻栎人工林的碳储量主要分布在乔木层和土壤层,且乔木层生物量占麻栎人工林生物量的主要部分。麻栎土壤固碳能力较强,可作为广西发展固碳林的优良树种。

【Objective】The biomass,carbon density,carbon storage and distribution pattern of 32 years old standing forest of Quercus acutissima plantation ecosystem in Nanning Liangfengjiang forestry park were studied to provide references for further research on increasing the carbon storage of Guangxi. 【 Method 】 In sample plot of Quercus a-cutissima plantation,harvest method and potassium dichromate-external heat method were used to measure the biomass and carbon content in organ of plant. 【Result 】The results showed that the average carbon content in different organs in tree layer of plantation increased in the order as coarse root medium rootthin rootbranchroot pocketbarkleaftrunk. The soil carbon content was the highest in 0-20 cm,and decreased with increasing depth.The total biomass of plantation ecosystem was 241.08 t/ha. And tree layer, undergrowth vegetable layer and litter layer occupied 97.90 %,0. 54 %, and 1. 56 % of the total biomass, respectively. 【 Conclusion 】 Quercus acutissima plantation has high potential of carbon sequestration, and carbon density is high in tree layer and soil layer. Quercus acutissima can be used as a carbon sequestration plant of Guangxi.