树种类型和潮滩高程对广东湛江高桥红树林碳储量的影响

doi:10.11978/2023074

摘要/Abstract

摘要：

红树林位于海洋与陆地的交界处, 其高效的碳汇能力易受多方面因素的影响。文章通过分析植物生长指标、生物量、植被碳储量和土壤碳储量以及土壤容重等参数, 研究了树种类型和潮滩高程对广东湛江高桥区红树林群落碳汇功能的单独作用和耦合效应。结果表明, 高桥红树林的固碳总量为4.98×10¹⁰g, 碳密度为107.76×10⁶g·hm^-2, 土壤碳积累是该红树林固碳的重要贡献。不同潮滩红树林的碳储量受树种差异的影响显著, 且低潮滩的红树林碳储量显著高于高潮滩和中潮滩, 而潮滩高程仅对无瓣海桑群落的碳储量具有显著影响。无论是植物碳库还是土壤碳库, 中潮滩红海榄群落和低潮滩无瓣海桑群落的碳密度最高。红树群落的土壤有机碳含量在垂直方向分布均匀, 各土层间无显著差异。在高潮滩和中潮滩, 土壤有机碳含量的垂直分布受树种影响, 大部分桐花树群落的土壤有机碳含量显著高于同土层的秋茄群落、白骨壤群落和无瓣海桑群落, 而树种对低潮滩各土层有机碳含量无显著影响。虽然树种类型和潮滩高程可影响土壤容重与土壤有机碳含量间的作用关系, 但线性拟合结果以负相关关系为主。

关键词: 红树林树种, 潮滩高程, 碳储量, 容重, 广东湛江

Abstract:

Mangroves are located at the junction between marine and land, and their carbon storage capacity depends on a variety of factors. In this study, the plant growth, biomass, soil organic carbon content and soil bulk density as well as the carbon storage in both vegetation and soil were compared in the mangrove communities in the Gaoqiao District, Zhanjiang, Guangdong, to study the individual and coupled effects of tree species and intertidal elevation factors on carbon storage. The results showed that carbon storage of mangrove communities was 4.98×10¹⁰ g and carbon density was 107.76×10⁶ g·hm^-2, and the carbon storage was mainly concentrated in soil. The carbon density of mangrove in different intertidal elevations were significantly affected by tree species, and the carbon storages of mangrove at low intertidal elevation was higher than those at middle and high intertidal elevation. The carbon storage of Sonneratia apetala communities was significantly affected by intertidal elevation. The carbon storage of Rhizophora stylosa communities at middle intertidal elevation and S. apetala communities at low intertidal elevation was greatest in this mangrove area, regardless of the perspective of vegetation carbon pool or soil carbon pool. In all mangrove communities, the vertical distribution of soil organic carbon content was homogeneous with no significant difference among soil layers. The vertical distribution of soil organic carbon contents at the high and middle intertidal elevation was influenced by tree species. Among them, the soil organic carbon content in the majority of Aegiceras corniculatum communities was significantly higher than those at the same soil layer of Kandelia obovata, Avicennia marina and S. apetala communities. However, tree species had no significant effect on the soil organic carbon content at the low intertidal elevation. Although the relationship of soil bulk density and soil organic carbon content was influenced by both tree species and intertidal elevation, the linear fitting results were mainly negative correlations. This study can provide a scientific basis for the selection of tree species and intertidal elevation for carbon sequestration in mangrove afforestation project.

Key words: tree species of mangrove, intertidal elevation, carbon storage, bulk density, Zhanjiang, Guangdong Province

周治刚, 岳文, 李辉权, 林阳阳. 树种类型和潮滩高程对广东湛江高桥红树林碳储量的影响[J]. 热带海洋学报, 2024, 43(2): 108-120.

ZHOU Zhigang, YUE Wen, LI Huiquan, LIN Yangyang. Influence of tree species and intertidal elevations on the carbon storage of the Gaoqiao mangrove area in Zhanjiang, Guangdong Province[J]. Journal of Tropical Oceanography, 2024, 43(2): 108-120.

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树种	地上生物量模型	地下生物量模型	参考文献
秋茄(Kandelia obovata)	B_a=0.0341(d²h)^1.03	B_u=0.0483(d²h)^0.834	Hoque等(2011)
无瓣海桑(Sonneratia apetala)	B_a=0.280(d²h)^0.693	B_u=0.038(d²h)^0.759	Ren等(2005)
桐花树(Aegiceras corniculatum)	lgB_a=1.496+0.465lg(d²h)	lgB_u=0.967+0.303lg(d²h)	Tam等(1995)
白骨壤(Avicennia marina)	lgB_a=2.113lgd-0.511	lgB_u=1.171lgd+0.106	Comley等(2005)
木榄(Bruguiera gymnorrhiza)	B_a=0.168d^2.31	B_u=0.0188(d²h)^0.909	Clough等(1989); Tam等(1995)
红海榄(Rhizophora stylosa)	B_a=0.2206d^2.4292	B_u=0.261d^1.86	Tamai等(1988); Fromard等(1998)