Guo Yang, Han Jiatong, Bao Haijun, Wu Yuzhe, Shen Liyin, Xu Xiangrui, Chen Ziwei, Smith Pete, Abdalla Mohamed
Research Institute for Urban Planning and Sustainability, Hangzhou City University, Hangzhou 310015, China; School of Public Affairs, Zhejiang University, Hangzhou 310058, China.
College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China.
Sci Total Environ. 2024 Oct 20;948:174788. doi: 10.1016/j.scitotenv.2024.174788. Epub 2024 Jul 15.
Urban greenspaces typically refer to urban wetland, urban forest and urban turfgrass. They play a critical role in carbon sequestration by absorbing carbon from the atmosphere; however, their capacity to retain and store carbon in the form of soil organic carbon (SOC) varies significantly. This study provides a systematic analysis and review on the capacity of different urban greenspace types in retaining and storing SOC in 30 cm soil depth on a global scale. Data came from 78 publications on the subject of SOC stocks, covering different countries and climate zones. Overall, urban greenspace types exerted significant influences on the spatial pattern of SOC stocks, with the highest value of 18.86 ± 11.57 kg m (mean ± standard deviation) in urban wetland, followed by urban forest (6.50 ± 3.65 kg m), while the lowest mean value of 4.24 ± 3.28 kg m was recorded in urban turfgrass soil. Soil organic carbon stocks in each urban greenspace type were significantly affected by climate zones, management/environmental settings, and selected soil properties (i.e. soil bulk density, pH and clay content). Furthermore, our analysis showed a significantly negative correlation between SOC stocks and human footprint in urban wetland, but a significantly positive relationship in urban forest and urban turfgrass. A positive correlation between SOC stocks and human footprint indicates that increased human activity and development can enhance SOC stocks through effective management and green infrastructure. Conversely, a negative correlation suggests that improper management of human activities can degrade SOC stocks. This highlights the need for sustainable practices to maintain or enhance SOC accumulation in urban greenspaces.
城市绿地通常是指城市湿地、城市森林和城市草坪。它们通过吸收大气中的碳在碳固存中发挥关键作用；然而，它们以土壤有机碳（SOC）形式保留和储存碳的能力差异很大。本研究对全球范围内不同类型城市绿地在30厘米土壤深度中保留和储存SOC的能力进行了系统分析和综述。数据来自78篇关于SOC储量主题的出版物，涵盖不同国家和气候区。总体而言，城市绿地类型对SOC储量的空间格局有显著影响，城市湿地中SOC储量最高，为18.86±11.57千克/平方米（平均值±标准差），其次是城市森林（6.50±3.65千克/平方米），而城市草坪土壤中的平均值最低，为4.24±3.28千克/平方米。每种城市绿地类型中的土壤有机碳储量受气候区、管理/环境设置以及选定的土壤性质（即土壤容重、pH值和粘土含量）的显著影响。此外，我们的分析表明，城市湿地中SOC储量与人类足迹之间存在显著负相关，而在城市森林和城市草坪中则存在显著正相关。SOC储量与人类足迹之间的正相关表明，人类活动和发展的增加可以通过有效管理和绿色基础设施来提高SOC储量。相反，负相关表明人类活动管理不当会使SOC储量下降。这凸显了采取可持续做法以维持或增强城市绿地中SOC积累的必要性。
