森林经营单位级碳储量动态变化研究——以广西热林中心为例

中国林业科学研究院热带林业实验中心从2008年开始进行人工林近自然经营,为了评价经营效果对森林固碳能力的影响,以热林中心2011年、2013年、2015年对238块系统抽样样地数据为基础,采用现有的生物量方程和碳转换系数乔木林碳储量进行估算。结果表明,乔木林碳储量由2011年的605826.95t增加到2015年的721847.04t,年平均增加29005.02t,碳密度由2011年的35.94t·hm^-2增加到2015年的42.34t·hm^-2,但仍小于全国和世界的平均数。针叶林碳储量高于阔叶林,由2011年的413753.07t增加至2015年的479611.05t,年均增加16464.50t,栎类的增长幅度最大,年均增长率64.00%,碳储量最大的树种是马尾松,占总碳储量的62.92%。证明近自然经营能够有效促进森林固碳能力。

Dynamic Changes of Carbon Stocks of Arbors in Experimental Center in Guangxi

Estimation was made on carbon stocks by biomass regression model and parameters of arbors in Experimental Center which was managed near-nature in Guangxi based on data of 238 systematic sampling plots in 2011, 2013 and 2015. The results showed that carbon stocks increased from 605 826.95 t in 2011 to 721 847.04 t in 2015. The average carbon density increased from 35.94 t·hm^-2 in 2011 to 42.34 t·hm^-2 in 2015, but still less than the national and world means. Carbon stocks of coniferous forest were higher than those of broad-leaved forest, which increased from 413 753.07 t in 2011 to 479 611.05 t in 2015. Quercus had greatest increase range of carbon stocks in broad-leaf trees, with an annual growth rate of 64.00%. Pinus massoniana had the largest carbon stocks, accounting for 62.92% of the total.