摘要:广西森林面积和覆盖率位居全国前列，在全国和区域碳平衡中起着至关重要的作用。正确评价广西森林植被碳储量、碳储量的时空格局及其影响因素对我国碳循环及碳汇研究具有十分重要的意义。为阐明广西森林植被碳储量分布格局及其主要影响因素，基于广西10类主要森林类型345个样地的调查，结合森林资源清查资料，估算广西主要森林植被碳储量，探讨广西不同森林类型、不同龄组、不同层次的碳储量组成与分配。采用地统计学方法描绘了植被碳密度空间分布，并采用主成分分析方法和回归分析方法分析了植被碳储量的影响因素。结果表明：广西主要森林植被总碳储量达到746.06 Tg（1Tg=10¹² g），平均碳密度为55.37 t/hm²，松树、杉木、桉树、栎类、软阔、硬阔、石山林、竹林、八角和油茶林对广西植被碳储量的贡献比例分别为26.83%、12.28%、6.67%、3.03%、20.37%、16.32%、10.84%、0.88%、1.38%和1.39%。各森林类型植被碳密度介于20.77-108.28 t/hm²，大小顺序为硬阔 > 软阔 > 松树 > 杉木 > 栎类 > 石山林 > 桉树 > 八角 > 竹林 > 油茶。广西区森林植被碳密度在7.05-219.73 t/hm²之间，总体表现为广西北部、西南部和广西东部存在高值区，广西中部和东南部有明显的低值区。碳储量以乔木层占优势，且随林龄增大呈逐渐增加的趋势。影响广西植被碳储量的主控因子是平均胸径、林龄和林分密度，经度、碱解氮、全氮、有机碳是影响碳储量的关键因子。



Abstract:Guagnxi boastes the forefront of national forest area and coverage, and takes a vital role in the national and regional carbon balance. Accurate assessment of vegetation carbon storage, spatial-temporal patterns, and the influencing factors in Guangxi has been of greatest significance for carbon cycling and carbon sequestration research in China. The objective of this study was to understand the spatial distribution of vegetation carbon storage and its influencing factors in the main forest ecosystems in Guangxi. A total of 345 sample plots were established and the size of each plot was 50 m×20 m. Based on forest resource inventory data and field investigations, vegetation carbon storage in the main forests in Guangxi was estimated, and the composition and distribution of carbon storage in various forest types for various stand ages and forest layers were assessed. Geostatistics were applied to analyze the spatial patterns of vegetation carbon storage and the effects of the main influencing factors on vegetation carbon storage were also explored using a principal component analysis and stepwise regression. The results showed that the total vegetation carbon storage was 746.06 Tg(1 Tg=10¹² g), and the vegetation carbon density was up to 55.37 t/hm². Pine, Chinesefir, eucalyptus, oak, hard broadleaves, soft broadleaves, forests in limestone areas, bamboo, anise, and oil-tea forests accounted for 26.83%, 12.28%, 6.67%, 3.03%, 20.37%, 16.32%, 10.84%, 0.88%, 1.38%, and 1.39% of the total vegetation carbon storage in Guangxi, respectively. The average vegetation carbon density of 10 major forest types ranged from 20.77 to 108.28 t/hm², with an order of hard broadleaves > soft broadleaves > pine > Chinesefir > oak > forests in limestone areas > eucalyptus > anise > bamboo > oil-tea. The average vegetation carbon density of forest types in Guangxi ranged from 7.05 to 219.73 t/hm². The north, southwest, and east of Guangxi had high carbon storage and the middle part and southeast had low carbon storage. The total carbon storage were dominated by the arbor layer and increased gradually with an increase in stand age. The main factors that affected forest vegetation carbon storage in Guangxi were the average diameter at breast height, forest age, and stand density. The longitude, available nitrogen, total nitrogen, and organic carbon were the most critical factors affecting forest vegetation carbon storage.





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