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通过样地实测生物量和采用重铬酸钾法测定植物碳素含量,研究了思茅松中幼龄人工林生物量碳密度的分配特征及随林龄的动态变化规律。结果表明:1)林龄为3～5、6～10、11～20和21～30 a思茅松人工林的生物量碳密度分别为(20.15±3.09)、(27.24±2.25)、(94.89±9.90)和147.58 t/hm2。随林龄增长,乔木层、枯落物层和林分的碳密度显著增加,灌木层和草本层的碳密度有所减少。林分、乔木层和枯落物层的生物量碳密度随林龄的变化用逻辑斯蒂模型可实现良好拟合,而灌木层和草本层拟合效果差。2)林龄为3～5、6～10、11～20和26 a思茅松人工林的年均固碳量分别为(4.92±0.63)、(3.52±0.25)、(6.44±0.30)和5.68 t/(hm2.a)。乔木层的年均固碳量与林龄存在显著正相关,灌木层和草本层的年均固碳量与林龄存在显著负相关,林分年均固碳量与林龄呈较弱的正相关。乔木层和草本层的年均固碳量与林龄的关系以逻辑斯蒂模型拟合效果较好,灌木层年均固碳量和林龄关系以Gauss模型拟合效果较好,林分的年均固碳量与林龄的拟合效果差。
The biomass of plantation and the determination of plant carbon content by potassium dichromate method were studied. The distribution characteristics of biomass carbon density of young plantation and dynamic changes with age were studied. The results showed that: 1) The biomass carbon density of Pinus kesiya var. Langbianensis plantations with the ages of 3-5, 10-10, 20-20 and 21-30 years were (20.15 ± 3.09), (27.24 ± 2.25) and (94.89 ± 9.90) and 147.58 t / hm2. With the increasing of age, the carbon density of tree layer, litter layer and stand increased significantly, and the carbon density of shrub layer and herb layer decreased. The biomass carbon density of stand, arbor and litter layer fitted well with Logistic model with the change of stand age, while the shrub layer and herb layer fitted poorly. 2) The annual average carbon sequestration of Pinus kesiya var. Langbianensis plantation with age of 3 ~ 5, 6 ~ 10, 11 ~ 20 and 26 a were (4.92 ± 0.63), (3.52 ± 0.25), (6.44 ± 0.30) t / (hm2.a). There was a significant positive correlation between the annual average carbon sequestration of tree layer and forest age. The annual average carbon sequestration of shrub layer and herb layer was significantly negatively correlated with forest age. Related. The relation between the annual average carbon sequestration of arborous layer and herb layer and the stand age was better fitted by the Logistic model, and the relationship between the annual average carbon sequestration of shrub layer and the stand age was better fitted by the Gauss model. The average annual carbon sequestration and forest age fitting effect is poor.