Effects of tree species composition and diameter class structure on biomass restoration of secondary tropical forest
Wang Lu-Ying1,2, Zhou Zhang1,3,4, Zhang Tao3, Lin Ming-Xian3, Zhang Chun-Sheng1,4, Li Yi-De1,4, Chen De-Xiang1,3,4
1. Research Institute of Tropical Forestry, Chinese Academy of Forestry, Jianfengling Long￣Term Research Station for Tropical Forest Ecosystem, Guangzhou 510520, China;
2. Nanjing Forestry University, Nanjing 210037, China;
3. Experimental Station of Research Institute of Tropical Forestry Chinese Academy of Forestry, Ledong, Hainan 572542, China;
4. Forest Carbon Sequestration Research and Experimental Center of the State Forestry and Grassland Administration, Sanya, Hainan 527000, China
In this study, 32 permanent plots with different recovery times were set up in Jianfengling and Diaoluoshan areas of Hainan Island within an elevational range of 245-1255 m above sea level in order to analyze the relationship between aboveground biomass and forest tree species composition and diameter at breast height (DBH) class. Results showed that the average aboveground biomass (AGB) of the pan-tropical forest was (155.38 ± 37.16) ×103 kg/hm2, while biomasses of the secondary forest of the lowland and montane rainforests were (137.91 ± 31.02) ×103 and (160.39 ± 42.13) ×103 kg/hm2, respectively. The biomass recovery rate and natural recovery time showed a significant positive correlation through binomial fitting, with more than 70 years required to restore 95% of AGB of the primary forest. In the process of community succession, the species composition and stand structure were constantly changing. The biomass proportion of the large-diameter tree class increased significantly with recovery time, whereas small-diameter trees decreased significantly with recovery time. The biomass ratio of the large-diameter tree class in the early recovery stage accounted for less than 10% of secondary forest, but increased to 20% in the middle recovery period, and reached 70% in primary forest. With ongoing recovery, the biomass ratio of fast-growing tree species in the community decreased by more than 10%,while the ratio of slow-growing tree species in the primary forest increased by 20%-32%. Thus, the AGB recovery rate in tropical secondary forests increased significantly with the increase in recovery time. The composition dynamics of large-diameter trees and slow-growing species during the recovery process are important drivers of forest biomass recovery. The results should help improve our understanding of the dynamic changes in AGB during tropical secondary forest recovery.
王璐颖, 周璋, 张涛, 林明献, 张春生, 李意德, 陈德祥. 树种组成和径级结构对热带次生林生物量恢复影响的研究[J]. 植物科学学报, 2022, 40(2): 169-176.
Wang Lu-Ying, Zhou Zhang, Zhang Tao, Lin Ming-Xian, Zhang Chun-Sheng, Li Yi-De, Chen De-Xiang. Effects of tree species composition and diameter class structure on biomass restoration of secondary tropical forest. Plant Science Journal, 2022, 40(2): 169-176.
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