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河南省鸡公山位于暖温带-亚热带过渡区,马尾松(Pinus massoniana Lamb)栎类混交林是该区域的典型林分类型。分别在鸡公山海拔200、400和600 m的天然松栎混交林分中设置样地,调查分析松栎混交林生态系统土壤碳密度和碳储量,测定林下植被层和凋落物层碳储量,用生物量方程法估测了乔木层各组分的生物量及碳储量,并与鸡公山天然落叶栎林生态系统总碳储量作了比较分析。结果表明,松栎混交林生态系统总碳储量为179.74t·hm-2,空间分布特征表现为乔木层(97.57 t·hm-2)>土壤层(70.56 t·hm-2)>凋落物层(10.57 t·hm-2)>灌木层(0.83 t·hm-2)>草本层(0.21 t·hm-2)。在不同采样层次上碳含量存在显著差异。200、400和600 m 3个海拔高度上,松栎混交林生态系统仅在土壤层碳储量存在显著差异(P<0.05),其他各层次差异均不显著;土壤层碳储量随着海拔升高而显著增加,随着土层深度增加而显著降低(P<0.05)。松栎混交林生态系统总碳储量与林分密度正相关,随着样地林分密度的增加而呈现上升趋势。松栎混交林总碳储量高于落叶栎林,但二者之间没有显著差异。这些结果揭示了该地区松栎混交林生态系统碳储量的分布特征,也为当地碳汇林业的经营提供了依据。
Jigong Mountain, Henan Province, is located in the transitional zone of warm temperate-subtropical zone and Pinus massoniana Lamb oak-mixed forest is a typical stand type in this area. The sampling plots were set up in natural mixed pine and oak forests at 200, 400 and 600 m above sea level in Jigong Mountain. The soil carbon density and carbon storage in the ecosystem of Pinus tabulaeformis mixed forest were investigated. The carbon storage of understory vegetation layer and litter layer Biomass equation method was used to estimate the biomass and carbon storage of each component of the arbor layer and compared with the total carbon storage of the natural deciduous oak forest ecosystem in Jigongshan. The results showed that the total carbon storage in the ecosystem of Pinus elliottii mixed forest was 179.74 t · hm-2, and the spatial distribution was characterized by the layers of litter (97.57 t · hm-2)> soil layer (70.56 t · hm-2) (10.57 t · hm-2)> shrub layer (0.83 t · hm-2)> herb layer (0.21 t · hm-2). There are significant differences in carbon content at different sampling levels. At 200, 400 and 600 m 3 above sea level, there was significant difference (P <0.05) in the carbon storage in the Pinus tabulaeformis mixed forest ecosystem only, while no significant difference was found in other layers. The carbon storage in the soil layer increased with elevation But increased significantly with the soil depth increasing (P <0.05). The total carbon storage in the ecosystem of mixed pine and oak was positively correlated with the stand density, and showed an upward trend with the increase of stand density. The total carbon storage in the pine-fir mixed forest was higher than that in the deciduous oak forest, but there was no significant difference between the two. These results revealed the distribution characteristics of carbon storage in the ecosystem of the pine-oak mixed forest in the region and provided the basis for the operation of the local carbon sink forestry.