基于森林清查资料的河南省森林植被碳储量动态变化

利用1994—1998年、1999—2003年、2004—2008年、2009—2013年河南省4期森林资源清查数据,运用生物量转换因子连续函数法和平均生物量法,估算了1998—2013年河南省森林植被的碳储量和碳密度变化。研究结果表明,河南省森林植被碳储量由1998年的45.57 Tg增加到2013年的107.98 Tg,年均碳汇量为4.16 Tg/a。乔木林碳储量和碳密度分别由1998年的33.54 Tg和22.39 Mg/hm~2增加到2013年的97.11 Tg和31.80 Mg/hm~2。乔木林碳储量在所有植被类型中占主体,4个森林清查时期乔木林碳储量占森林植被总碳储量的比例分别为73.60%、79.22%、85.63%和89.93%。2013年森林清查时,乔木林中杨树和栎类碳储量最大,分别占总碳储量的37.61%和25.22%,各龄组乔木林碳密度大小顺序依次为成熟林近熟林中龄林过熟林幼龄林。阔叶林面积、碳储量、碳密度均高于针叶林,阔叶林是河南省森林碳汇的主要贡献者。人工林面积、碳储量、碳密度增加幅度都要高于天然林,人工林碳储量由1998年的9.62 Tg增加到2013年的55.67 Tg,占乔木林碳储量总增量的77.15%,人工林碳密度由1998年的17.86 Mg/hm~2提高到2013年的32.01 Mg/hm~2,人工林在河南省森林碳汇中逐步发挥重要的作用,逐渐成为河南省森林碳汇的主体,随着人工林生长为具有较高碳密度的成熟林,河南省乔木林将具有较大的碳汇潜力。

Dynamic of forest vegetation carbon storage in He'nan Province based on forest inventory data

Based on the forest resources inventory data of 1994-1998, 1999-2003, 2004-2008, and 2009-2013 in He''nan Province, the dynamic changes in forest vegetation carbon storage and density between 1998 and 2013 were estimated by using the continuous biomass expansion factor method and average biomass method. The results showed that the carbon storage of forest vegetation in the He''nan Province increased from 45.57 Tg in 1998 to 107.98 Tg in 2013, with an annual carbon sink of 4.16 Tg year^-1. The carbon storage and density of arbor forests increased from 33.54 Tg and 22.39 Mg hm^-2 in 1998 to 97.11 Tg and 31.80 Mg hm^-2 in 2013, respectively. The carbon storage of arbor forests comprised the largest proportion of storage for all vegetation types; the proportion of carbon storage of arbor forests to total carbon storage of forest vegetation in the four forest inventory periods was 73.60%, 79.22%, 85.63%, and 89.93%, respectively. In 2013, Populus and Quercus had the largest carbon storage, accounting for 37.61% and 25.22% of the total carbon storage in arbor forests, respectively. The carbon density of arbor forests in each age group was ranked in the following order:mature forest > premature forest > middle-aged forest > over-mature forest > young-aged forest. The area, carbon storage and carbon density of broad-leaved forests were higher than those of coniferous forests, and broad-leaved forests were the main contributor to the forest carbon sink in He''nan Province. The area, carbon storage and carbon density of the planted forests increased more than the natural forests. The carbon storage of planted forests increased from 9.62 Tg in 1998 to 55.67 Tg in 2013, accounting for 77.15% of the total increment of carbon storage in arbor forests. The carbon density of planted forests increased from 17.86 Mg hm^-2 in 1998 to 32.01 Mg hm^-2 in 2013. The importance of the role of planted forests in the forest carbon sink of He''nan Province is gradually emerging. As the planted forests grow into mature forest with a high carbon density, the arbor forests in He''nan Province will have greater carbon sequestration potential.