What factors are influencing peri-urban forest carbon storage in different land use types based on permanent plots from 2009–2018

IF 2.5 3区 环境科学与生态学 Q2 BIODIVERSITY CONSERVATION Urban Ecosystems Pub Date : 2024-03-08 DOI:10.1007/s11252-023-01461-6
Yanyan Wei, Min Zhao, Jun Gao
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Abstract

Urban forests are crucial in reducing atmospheric carbon dioxide (CO2) concentrations. Forest structure and composition in particular are important indicators influencing forest carbon storage. In this study, a long-term survey in Chongming Island was used as a case study to examine temporally the changes in an urban forest and its assemblage of woody plant specifically during 10 years. We measured species evenness, species diversity, canopy cover, tree density and aboveground carbon storage (ACS) in three broad land use types including agriculture uses (ALU), forest land uses (WLU), and constructed land uses (CLU). Using field data from long-term permanent plots and structural equation modeling (SEM), the objective of the study was to estimate the direct and indirect effects of these metrics on ACS across these three land use types. The study showed that species evenness, species diversity, canopy cover, and tree density all increased in the ALU, WLU, and CLU. Meanwhile, the tree ACS was higher than shrub ACS. Average ACS increased by 2.07, 9.89, 4.06 MgC/ha in CLU, ALU, CLU, respectively. Both key dominant species, Cinnamomum camphora and Metasequoia glyptostroboides played critical roles in determining ACS. Vegetation density strongly directly affected on ACS in WLU, whereas canopy cover exerted the similar effect on ACS in ALU. Additionally, species evenness had a strong positive direct effect on ACS, but a strong negative direct effect of species diversity occurred. Finally, a strong positive indirect effect on ACS from canopy cover was found in CLU from 2009 to 2018. The findings can provide useful assessment indicators for managing peri-forests to improve forest carbon storage to speed up accomplishment of Sustainable Development Goals (SDGs).

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基于 2009-2018 年永久性地块,哪些因素影响不同土地利用类型的城郊森林碳储存
城市森林对于降低大气中的二氧化碳(CO2)浓度至关重要。森林结构和组成尤其是影响森林碳储量的重要指标。本研究以崇明岛的一项长期调查为例,从时间上考察了城市森林及其木本植物群在 10 年间的变化。我们测量了包括农业用地(ALU)、林业用地(WLU)和建设用地(CLU)在内的三大土地利用类型的物种均匀度、物种多样性、树冠覆盖率、树木密度和地上碳储量(ACS)。利用长期永久性地块的实地数据和结构方程模型(SEM),该研究旨在估算这些指标对这三种土地利用类型的 ACS 的直接和间接影响。研究表明,在 ALU、WLU 和 CLU 中,物种均匀度、物种多样性、树冠覆盖率和树木密度都有所增加。同时,乔木 ACS 高于灌木 ACS。CLU、ALU和CLU的平均ACS分别增加了2.07、9.89和4.06毫克碳/公顷。主要优势树种樟树和水杉对 ACS 起着至关重要的作用。在 WLU 中,植被密度对 ACS 有直接影响,而在 ALU 中,冠层覆盖对 ACS 也有类似的影响。此外,物种均匀度对 ACS 有很强的正向直接影响,但物种多样性对 ACS 有很强的负向直接影响。最后,2009 年至 2018 年期间,在中国林业大学发现了树冠覆盖对 ACS 的强烈正向间接影响。这些研究结果可为围森林管理提供有用的评估指标,以提高森林碳储量,加快实现可持续发展目标(SDGs)。
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来源期刊
Urban Ecosystems
Urban Ecosystems BIODIVERSITY CONSERVATION-ECOLOGY
CiteScore
5.70
自引率
6.90%
发文量
113
期刊介绍: Urban Ecosystems is an international journal devoted to scientific investigations of urban environments and the relationships between socioeconomic and ecological structures and processes in urban environments. The scope of the journal is broad, including interactions between urban ecosystems and associated suburban and rural environments. Contributions may span a range of specific subject areas as they may apply to urban environments: biodiversity, biogeochemistry, conservation biology, wildlife and fisheries management, ecosystem ecology, ecosystem services, environmental chemistry, hydrology, landscape architecture, meteorology and climate, policy, population biology, social and human ecology, soil science, and urban planning.
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