【摘要】 基于冀北山地不同林龄64块油松人工林样地生物量调查，探讨了不同发育阶段油松人工林群落碳密度的时空变化规律。结果表明：随着林龄增大，器官生物量分配情况差异显著，树干生物量所占比例显著升高；以单位面积蓄积量V=13 m~3/hm~2为划分依据，建立了生物量分段估计模型，可以提高估计精度；碳计量参数分布合理，且同林龄具有显著相关性，BEF值和BCEF值随林龄增大而减小，R值和WD值相对稳定；群落碳密度随林龄增加而增大，为5.640～61.446 t/hm~2,空间分布表现为乔木层>凋落物层>林下植被层，各层碳密度均值分别为29.356、0.887和0.522 t/hm~2;群落及乔木层固碳量随林龄表现为先增大后减小再增大的趋势，26～30 a固碳量最大，分别为4.669和4.658 t/(hm~2·a),抚育后41～48 a的成熟林仍具有较高碳汇潜力，其他层(林下植被+凋落物层)年固碳量较低，为0.012～0.158 t/(hm~2·a)。更多还原

【Abstract】 The present study assessed the carbon density in an age-sequence of Pinus tabuliformis plantations, based on the biomass investigation of 64 sampling plots in mountainous areas of Northern Hebei Province. The difference in the allocation of tree organ biomass was significant, whereas the relative contribution of stem biomass to total tree biomass increased with stand age. Based on the unit area accumulation V=13 m~3/hm~2, a segmented biomass estimation model was established to improve the estimation accuracy. The carbon measurement parameters were reasonable in steps and had a significant correlation with the same plantation age. The BEF and BCEF values decreased along the chronosequence, while the R and WD values remain relatively stable. The carbon density of the P. tabuliformis plantation increased with stand age, ranging from 5.640 to 61.446 t/hm~2. The carbon density of different layers was as follows: tree layer(29.356 t/hm~2) > litter layer(0.887 t/hm~2) > understory vegetation layer(0.522 t/hm~2). The carbon sequestration of community and tree layer was fast in the early stage of plantation, and then slowed down, and then increased as the plantation aged. The highest annual carbon sequestration of community and tree layer occurred at 26-30 years old, with the value of 4.669 and 4.658 t/(hm~2·a), respectively. Mature plantations aged from 41 to 48 years still had high carbon sequestration potential, while the annual carbon sequestration in other layers(understory vegetation and litter layer) is relatively low, ranging from 0.012 to 0.158 t/(hm~2·a).更多还原