Subtropical Plant Science >

2025 , Vol. 54 >Issue 6: 645 - 652

DOI: https://doi.org/10.3969/j.issn.1009-7791.2025.06.006

Research articles

Photosynthetic Characteristics and Carbon Sequestration Capacity of Six Landscape Shrubs in Zhangzhou in Autumn

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  • (1. Fujian Zhongzi Planning and Design Research Group Co., Ltd., Zhangzhou 363007, Fujian China; 2. Fujian Zhongzi Engineering Consulting Co., Ltd., Fuzhou 350000, Fujian China; 3. Key Laboratory of Landscape Plants with Fujian and Taiwan Characteristics of Fujian Colleges and Universities, School of Biological Science and Technology, Minnan Normal University, Zhangzhou 363000, Fujian China)

Received date: 2025-09-28

  Accepted date: 2025-11-12

  Online published: 2026-02-10

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Abstract

This study investigated six common garden shrubs (Ficus benjamina, Fagraea ceilanica, Ficus microcarpa 'Golden Leaves', Ixora chinensis, Allamanda cathartica, and Heptapleurum heptaphyllum) in Bihu Park, Zhangzhou City. By measuring light response curves, chlorophyll content, and gas exchange parameters, the differences in their photosynthetic characteristics and carbon sequestration-oxygen release capacity were systematically analyzed. The results showed that the total chlorophyll content of Ficus benjamina, Allamanda cathartica, and Ixora chinensis was significantly higher than those of Fagraea ceilanica, Ficus microcarpa 'Golden Leaves', and Heptapleurum heptaphyllum (P＜0.05). The diurnal variation of net photosynthetic rate (Pn) in Ficus microcarpa 'Golden Leaves', Ixora chinensis, and Ficus benjamina exhibited an "increase-decrease" trend, whereas Allamanda cathartica and Fagraea ceilanica showed a continuous decline in Pn. With increasing photosynthetically active radiation (PAR), stomatal conductance (Gs) and transpiration rate (Tr) generally rose. Significant differences (P＜0.05) were observed in daily net assimilation, carbon sequestration, and oxygen release per unit leaf area among the six plants. Ficus benjamina performed the best (daily net assimilation 181.254 mmol·m–2·s–1; carbon sequestration 6.374 g·m–2·d–1; oxygen release 4.639 g·m–2·d–1), while Fagraea ceilanica was the weakest. Light response curve fitting revealed that Ixora chinensis had the highest light saturation point (LSP, 1592.633 μmol·m–2·s–1), and Heptapleurum heptaphyllum exhibited significantly lower light compensation points (LCP) than other species, demonstrating better adaptability to low light. Allamanda cathartica had the highest maximum net photosynthetic rate (7.38 μmol·m–2·s–1) and dark respiration rate (3.588 μmol·m–2·s–1). Considering photosynthetic and carbon sequestration characteristics, it is recommended to prioritize shrubs with high light energy utilization efficiency, such as Ficus benjamina and Ixora chinensis, in urban greening to enhance carbon-oxygen balance regulation.

Key words： photosynthetic characteristics; carbon sequestration-oxygen release; garden shrubs; chlorophyll

Cite this article

XU Shao-liang, REN Qun-xing, TAO Yong, CAI Jun-huang, BIAN A-na, YAO Xin-zhuo, ZHANG Jia-jia . Photosynthetic Characteristics and Carbon Sequestration Capacity of Six Landscape Shrubs in Zhangzhou in Autumn[J]. Subtropical Plant Science, 2025 , 54(6) : 645 -652 . DOI: 10.3969/j.issn.1009-7791.2025.06.006

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