基于第8次森林资源清查数据的广西森林碳储量特征研究

摘要

以广西第8次森林资源清查数据为基础,采用生物量-蓄积量转换函数和平均生物量法,结合不同树种的含碳率,估算了广西森林植被的碳储量与碳密度,分析了不同优势种和龄组的碳储量分布特征.结果表明:广西不同林地类型的总碳储量为1.97×108 t,平均碳密度为14.87 t/hm2,其中乔木林和灌木林的碳储量占总碳储量的99.86%;不同龄组乔木林的碳储量大小为中龄林>幼龄林>近熟林>成熟林>过熟林,其中中龄林和幼龄林碳储量占全省乔木林碳储量的72.21%.天然林的碳储量高于人工林的碳储量,天然阔叶混交林和马尾松林占天然林碳储量的77.28%,人工桉树、 杉木和马尾松等林分占人工林碳储量的87.32%;用材林、 防护林和经济林三大林种的碳储量占全省乔木林碳储量的93.24%,其中用材林的碳储量最高,占60.08%,而碳密度表现为特用林>防护林>用材林>经济林>薪炭林.%According to the 8th forest inventory data of Guangxi Province, the carbon storage and carbon densi-ty of forests in Guangxi Province were estimated, using the volume-derived biomass method and average-biomass methods and combining the carbon content rate of various dominant tree species. In addition, the distribution char-acteristic of carbon storage was analyzed according to dominant tree species, age groups and forest category. The re-sult were as follows:the total carbon storage of forestland was 1. 97 × 108 t in Guangxi Province, and the average carbon density was 14. 87 t/hm2 . The carbon storage of arboreal forest and shrubs accounted for 99. 86%of the total forest carbon storage. The carbon storage of forest age groups was in the following order: middle-aged forests >young forests >near-mature forests>mature forests>over-mature forests. The carbon storage of middle-aged forests and mature forests accounted for 72. 21% of the total forest carbon storage. The carbon of natural forest was higher than plantations. Mixed broadleaved forest and masson pine accounted for 77. 28% of the natural forest carbon stor-age, meanwhile, the plantation of Eucalyptus sp., Cunninghamia lanceolata and Pinus massoniana accounted for 87. 32% of the plantations. Timber forest, protection forests and non-timber product forest accounted for 93. 24% of carbon storage of arboreal forest. The carbon storage of timber forest was the highest, which accounted for 60. 08%of carbon storage of arboreal forest. The carbon density of forest category followed the sequence of middle-aged for-ests special-purpose forest > protection forest > timber forest > non-timber product forest > fuel wood.