Ecosystem degradation assessment of seagrass beds along the South China coast based on ecosystem collapse risk
FENG Ling-yang1, ZHANG Dian1,2,3, CHEN Bin1,2, KAN Zhi-yi1,2,3, LIN Jin-lan4, CHEN Guang-cheng1,2, MA Zhi-yuan1,2, FANG Qin-hua3, YU Wei-wei1,2
1. Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China; 2. Key Laboratory of Marine Ecological Protection and Restoration in Fujian Province, Xiamen 361005, China; 3. College of the Environment &Ecology, Xiamen University, Xiamen 361102, China; 4. Guangxi Academy of Oceanology, Nanning 530022, China
Abstract:Accurately assessing the degradation status of seagrass bed ecosystems was essential for formulating effective protection and restoration decisions However, existing assessments of seagrass bed ecological degradation were primarily conducted from the health perspective, neglecting the endpoint of degradation and its critical levels during the degradation process. This study took ecosystem collapse as the endpoint of degradation and, from an ecological risk perspective, the assessment framework of the Red List of Ecosystems was drawn upon. Three main criteria—habitat range degradation, abiotic environmental degradation, and biological process degradation—were integrated to establish an assessment framework for seagrass bed ecosystem degradation. Fourteen seagrass bed distribution areas along the South China coast were selected for empirical study. The assessment results showed that the seagrass bed in Tangjiawan had reached an extremely degraded level. Eight seagrass beds, such as Zhelin Bay, were severely degraded (57%); the seagrass bed in Li'an Port was moderately degraded; and four seagrass beds, such as Liusha Bay, were slightly degraded (29%). Among the three major assessment criteria, biological processes were identified as the main manifestation of seagrass bed degradation along the South China coast. From the perspective of ecosystem collapse risk, a framework for assessing seagrass bed ecosystem degradation was constructed, providing a new perspective for evaluating the degradation status of seagrass beds and other ecosystems, and offering important decision-making support for ecosystem conservation and restoration.
奉龄洋, 张典, 陈彬, 阚志毅, 林金兰, 陈光程, 马志远, 方秦华, 俞炜炜. 基于生态系统崩溃风险的华南沿岸海草床生态系统退化评估[J]. 中国环境科学, 2025, 45(4): 2197-2207.
FENG Ling-yang, ZHANG Dian, CHEN Bin, KAN Zhi-yi, LIN Jin-lan, CHEN Guang-cheng, MA Zhi-yuan, FANG Qin-hua, YU Wei-wei. Ecosystem degradation assessment of seagrass beds along the South China coast based on ecosystem collapse risk. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(4): 2197-2207.
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