摘要
为探究红树植物组成与群落碳储能力的关系,采用胸径和木材密度参数,通过异速生长模型分别估算植物地上和地下生物量,比较福田红树林外来与乡土植物群落生物量差异及年际动态,并分析林龄对外来红树植物群落生物量的影响.结果显示,2017-2023年间乡土植物白骨壤Avicennia marina、秋茄Kandelia obovata、木榄Bruguiera gymnorhiza群落单位地表面积生物量增长不显著,但外来植物无瓣海桑Sonneratia apetala(17年及23年)生物量增长显著.随着林龄增加,无瓣海桑群落的单位地表面积生物量逐渐超过乡土植物秋茄群落,在2023年,几乎所有林龄的无瓣海桑群落均与秋茄群落单位地表面积生物量差异显著.另一方面,无瓣海桑的增长速率随林龄增加逐渐放缓,生物量逐渐达到饱和并趋于稳定.研究表明,深圳福田的乡土红树植物群落已经达到顶极群落生物量的稳定期甚至个别开始衰退,而外来植物无瓣海桑与海桑S.casedaris群落则保持继续增长,特别是无瓣海桑群落的增长速率最大.不同林龄无瓣海桑的生物量年增长速率基本符合随林龄增加而减小的趋势.未来研究应当从外来植物与乡土植物的碳固存能力、外来植物对乡土红树植物生长及分布的影响等角度,比较与权衡外来植物对红树林碳储碳汇及植被演替方面的影响.(图3表5参40)
Using diameter at breast height and wood density,we estimated the above-and below-ground tree biomass by means of an allometric growth model to explore growth differences between exotic and native mangrove species in the Futian mangrove in Shenzhen Bay.Subsequently,we compared the difference in biomass per unit area and the interannual changes in exotic and native plant communities.Although native species showed non-significant annual growth trends,the biomass of 17 and 23 year-old Sonneratia apetala trees increased significantly.Further,biomass per unit area of the S.apetala community increased significantly more than that of the native species community with increasing forest age.In 2023,nearly all S.apetala communities exhibited higher biomass per unit area than the community dominated by Kandelia obovata.The growth rate of S.apetala decreased with increasing forest age,and its biomass gradually reached a peak followed by a stable phase.Overall,the mangrove community of native species in Futian reached a community biomassstability period,whereas exotic species continued to grow,especially the S.apetala community,which showed the highest growth rate.However,the annual growth rate of this species showed decreasing trend with age,and biomass gradually reached a maximum and tended to stabilize.Future studies should consider the contribution of exotic plants to mangrove carbon storage and sinks from a perspective of carbon sequestration capacity by exotic and native mangrove species,as well as the influence of exotic plants on growth and distribution of native mangrove species.
作者
胡平
向雪莲
黄子健
谭敏
余世孝
杨琼
HU Ping;XIANG Xuelian;HUANG Zijian;TAN Min;YU Shixiao;YANG Qiong(Guangdong Neilingding-Futian National Nature Reserve,Shenzhen 518040,China;School of Life Sciences/Guangzhou Key Laboratory of Urban Landscape Dynamics,Sun Yat-sen University,Guangzhou 510275,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2024年第5期929-934,共6页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目(31770513)
深圳市城市管理局科研项目(201801)资助。
关键词
福田红树林
无瓣海桑
外来物种
乡土物种
生物量
林龄
Futian mangrove
Sonneratia apetala
exotic species
native species
biomass
tree age
