马尾松林生态系统碳贮量研究

摘要

The carbon storage (CS) of Pinus massoniana occurring in Hunan, China at different growing stages were estimated through field survey. The results showed that the total amounts of CS of the young, middle-aged and mature Pinus massoniana forest ecosystems were 120.47, 161. 18, and 187.29 t · hm~2, respectively. CS of the tree layers in three growing stages accounted for 16. 23% , 34. 09% and 38. 81% in the whole ecosystem. Within the tree layers, CS of branches, stems and roots increased along with P. massoniana forest age growth while the bark and leaves were opposite. The total amounts of CS of the soil layers of three growing stages accounted for 81. 18% , 62. 93% and 59. 06% of the total, respectively, suggesting that the soil layer played an important role. The CS of the soil declined along with the soil depth, and mainly gathered in the soil surface (0— 40 cm ) , Changes of CS of shrub layer, herb layer and litter layer were varied in the order of middle-aged>mature>young.%对湖南省不同年龄阶段的马尾松林生态系统的碳贮量进行了研究.结果表明:马尾松幼龄林、中龄林和成熟林生态系统总碳贮量分别是120.47、161.18 t·hm-2和187.29 t·hm-2,乔木层占总碳贮量的比重分别是16.23％、34.09％和38.81％,且表现为乔木层幼林碳贮量增长迅速,中龄林以后长势降低,从乔木层各部分器官碳贮量的分配来说,枝条、树干和根随林龄的增加而增加,而树皮和树叶则相反.土壤层占总碳贮量的比重分别是81.18％、62.93％和59.06％,可见,土壤层是马尾松林生态系统碳贮量的主体,含碳量随着土壤厚度的增加而减少,且主要集中在土壤的表层,其中0～40 cm的碳贮量贡献最大.林下灌木层、草本层和凋落物层碳贮量的积累与林龄的变化并不一致.中龄林灌木层、草本层和凋落物层的碳贮量最大,成熟林次之,幼龄林最小.