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<p>Urban roadside trees can support local environmental regulation in rapidly urbanizing tropical cities, yet species-level evidence on their carbon-related performance remains limited. This study compared the aboveground biomass, carbon stock, estimated CO₂ sequestration, chlorophyll content, leaf area, and environmental responses of <i>Samanea saman</i> and <i>Pterocarpus indicus</i> along the Malang–Surabaya arterial road corridor, Indonesia. Sixty mature trees were sampled across three stations using non-destructive allometric estimation based on diameter at breast height (DBH), supported by physiological and environmental measurements. Both species showed substantial aboveground biomass and carbon stock estimates, with estimated CO₂ sequestration of approximately 2.9–3.0 t CO₂ per tree within the accounting framework applied. <i>Pterocarpus indicus</i> exhibited more stable biomass and physiological values across stations, whereas <i>Samanea saman</i> showed greater variability, indicating stronger sensitivity to local site conditions. Overall, both species contributed to local carbon storage and roadside environmental quality, although their role is complementary rather than sufficient to offset broader urban transport emissions.</p>

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Carbon sequestration potential of urban roadside trees: a comparative study of Samanea saman and Pterocarpus indicus in Indonesia

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Prana Nala Shekina,
  • Fida Rachmadiarti

摘要

Urban roadside trees can support local environmental regulation in rapidly urbanizing tropical cities, yet species-level evidence on their carbon-related performance remains limited. This study compared the aboveground biomass, carbon stock, estimated CO₂ sequestration, chlorophyll content, leaf area, and environmental responses of Samanea saman and Pterocarpus indicus along the Malang–Surabaya arterial road corridor, Indonesia. Sixty mature trees were sampled across three stations using non-destructive allometric estimation based on diameter at breast height (DBH), supported by physiological and environmental measurements. Both species showed substantial aboveground biomass and carbon stock estimates, with estimated CO₂ sequestration of approximately 2.9–3.0 t CO₂ per tree within the accounting framework applied. Pterocarpus indicus exhibited more stable biomass and physiological values across stations, whereas Samanea saman showed greater variability, indicating stronger sensitivity to local site conditions. Overall, both species contributed to local carbon storage and roadside environmental quality, although their role is complementary rather than sufficient to offset broader urban transport emissions.