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

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

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。

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.