作为基于自然的解决方案,城市公园植物群落在调节城市碳循环中起着举足轻重的作用,缓解全球气候变化,促进城市可持续发展。然而,温带季风气候区城市公园植物群落碳汇效率的影响因素尚未得到充分研究。本研究使用多元异构数据来评估济南市25个城市公园不同生物群落类型的植物群落碳储量(CS)和年度碳固存(ACS)。位于中国温带季风气候区的城市。利用斯皮尔曼相关性揭示了影响碳汇效率的驱动机制,回归,主成分分析,和结构方程建模。结果表明:1)与其他植被结构相比,封闭的阔叶多层绿地具有显着的碳汇潜力。2)植物群落碳汇效率与天景因子和种植布局密度呈负相关。三维绿色量(3DGQ),树木和灌木的比例,物种丰富度,垂直结构与植物群落碳储量和固存呈正相关。3)是否增加3DGQ,树木和灌木的比例,或所有物种的个体总数,提高植物群落碳汇效益存在一定的门槛瓶颈。4)植物群落结构,物种组成,物种多样性影响碳汇效率,共同形成第一主成分。3DGQ作为第二主要成分影响碳汇效率。这些驱动因素之间存在协同作用,共同解释了植物群落CS和ACS的64.3%和90.1%,分别。提出了城市公园不同植物群落的优化设计策略。
As nature-based solutions, urban park plant communities play a pivotal role in regulating urban carbon cycles, alleviating global climate change, and fostering sustainable urban development. However, the factors influencing the carbon sink efficiency of plant communities in urban parks within temperate monsoon climate zones have not been fully investigated. This study used multivariate heterogeneous data to evaluate plant communities\' carbon storage (CS) and annual carbon sequestration (ACS) in 25 urban parks across different biotope types in Jinan, a city located in China\'s temperate monsoon climate zone. The driving mechanisms affecting carbon sink efficacy were revealed using Spearman correlation, regression, principal component analyses, and structural equation modeling. Results demonstrated that: 1) Closed broadleaf multi-layer green space has significant carbon sink potential compared to other vegetation structures. 2) The carbon sink efficiency of the plant communities negatively correlated with the sky view factor and planting layout density. Three-dimensional green quantity (3DGQ), the ratio of trees and shrubs, species richness, and vertical structures positively correlated with plant communities\' carbon storage and sequestration. 3) Whether increasing 3DGQ, the ratio of trees and shrubs, or the total number of individuals of all species, there is a certain threshold bottleneck in enhancing the carbon sink benefits of plant communities. 4) Plant community structure, species composition, and species diversity influenced carbon sink efficiency, collectively forming the first principal component. The 3DGQ affected carbon sink efficiency as the second principal component. Synergistic effects existed among these driving factors, jointly explained 64.3 % and 90.1 % of the CS and ACS of plant communities, respectively. Optimization design strategies for different plant communities in urban parks were proposed.