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<p>To assess the carbon sequestration benefits of urban green space (UGS) as urban green infrastructure (UGI), 24 garden tree species from Suzhou Bailuyuan Park were analyzed for their four-season photosynthetic characteristics, carbon sequestration potential, and the influence of climate factors. The results showed: (1) The net photosynthetic rate exhibited both single-peak and double-peak patterns in spring and summer, with highest peaks around 10:00 and 12:00 in summer, and a few species reaching their maximum rate at 8:00. Evergreen species had higher carbon sequestration and oxygen release in summer and autumn, with the lowest capacity in winter. Deciduous species exhibited stronger oxygen sequestration in spring and summer. (2) The direct effects of photosynthetically active radiation (PAR), humidity (RH), temperature (Ta), and atmospheric CO2 concentration (Ca) on oxygen fixation and release were as follows: spring: Ca &gt; PAR &gt; RH &gt; Ta; summer: RH &gt; PAR &gt; Ca &gt; Ta; autumn: PAR &gt; RH &gt; Ca &gt; Ta; winter: Ta &gt; PAR &gt; Ca &gt; RH. In spring, summer, and autumn, carbon sequestration and oxygen release were significantly positively correlated with RH and PAR (<i>p</i> &lt; 0.01), with seasonal variability in other factors. (3) To improve the carbon sink function of urban green spaces, plant selections for Suzhou should prioritize <i>Camphora officinarum, Prunus mume, Osmanthus fragrans, Photinia serratifolia, and Pittosporum tobira</i>.</p>

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Urban green infrastructure as a carbon sink: seasonal photosynthetic performance and carbon sequestration potential of 24 common urban tree species in Suzhou

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Jiali Sun,
  • Qiuyan Wang,
  • Lifen Wang,
  • Xiangdong Xiao,
  • Xianyu Mao

摘要

To assess the carbon sequestration benefits of urban green space (UGS) as urban green infrastructure (UGI), 24 garden tree species from Suzhou Bailuyuan Park were analyzed for their four-season photosynthetic characteristics, carbon sequestration potential, and the influence of climate factors. The results showed: (1) The net photosynthetic rate exhibited both single-peak and double-peak patterns in spring and summer, with highest peaks around 10:00 and 12:00 in summer, and a few species reaching their maximum rate at 8:00. Evergreen species had higher carbon sequestration and oxygen release in summer and autumn, with the lowest capacity in winter. Deciduous species exhibited stronger oxygen sequestration in spring and summer. (2) The direct effects of photosynthetically active radiation (PAR), humidity (RH), temperature (Ta), and atmospheric CO2 concentration (Ca) on oxygen fixation and release were as follows: spring: Ca > PAR > RH > Ta; summer: RH > PAR > Ca > Ta; autumn: PAR > RH > Ca > Ta; winter: Ta > PAR > Ca > RH. In spring, summer, and autumn, carbon sequestration and oxygen release were significantly positively correlated with RH and PAR (p < 0.01), with seasonal variability in other factors. (3) To improve the carbon sink function of urban green spaces, plant selections for Suzhou should prioritize Camphora officinarum, Prunus mume, Osmanthus fragrans, Photinia serratifolia, and Pittosporum tobira.