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<p>Seagrass meadows are typical blue carbon ecosystem with a strong capacity to mitigate the impacts of climate change. However, greenhouse gas (GHG) emissions can partially offset these blue carbon benefits. Currently, continuous monitoring of GHGs in seagrass meadows remains limited. This study focuses on seagrass meadows within a lagoon in northern China. Using dissolved methane (CH<sub>4</sub>) sensors and multi-parameter water quality meter, <i>in-situ</i> data on CH<sub>4</sub> concentrations and associated parameters were collected from December 11, 2023, to March 26, 2024. The results indicated that the CH<sub>4</sub> concentration decreased as tidal level increased, reaching their highest value of approximately 0.077 µmol/L (standard deviation, SD = 0.004 4) at the lowest tidal level. Diurnal variations in CH<sub>4</sub> concentrations were observed, possibly influenced by factors like temperature and light intensity. Daytime CH<sub>4</sub> levels (0.052 µmol/L, SD = 0.011) were higher than nighttime levels (0.047 µmol/L, SD = 0.004 9), with peas concentrations of 0.063 µmol/L (SD = 0.001 2) occurring in the mid-morning. Seasonal transition in CH<sub>4</sub> concentrations between winter and spring were evident, with temperature being a dominant factor. The lowest CH<sub>4</sub> levels (0.025 µmol/L, SD = 0.015) were observed in February when temperatures were lowest. Nutrient availability may enhance CH<sub>4</sub> production. It is estimated that during a single tidal cycle, Swan Lake can release approximately 134.42 mol of CH<sub>4</sub> into the open sea, thereby significantly reducing the blue carbon benefits of the seagrass meadows. This study provides valuable data support for global research on CH<sub>4</sub> dynamics in seagrass ecosystems and underscores the importance of seagrass meadows in addressing climate challenges.</p>

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In-situ monitoring reveals the determinants of dissolved methane concentrations within seagrass meadows in a lagoon in northern China

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Rui Jin,
  • Xiaoyong Duan,
  • Ping Yin,
  • Xue Li,
  • Bin Chen,
  • Ke Cao,
  • Shenghua Lv,
  • Daolai Zhang,
  • Xingliang He,
  • Xianguo Li,
  • Dahai Zhang

摘要

Seagrass meadows are typical blue carbon ecosystem with a strong capacity to mitigate the impacts of climate change. However, greenhouse gas (GHG) emissions can partially offset these blue carbon benefits. Currently, continuous monitoring of GHGs in seagrass meadows remains limited. This study focuses on seagrass meadows within a lagoon in northern China. Using dissolved methane (CH4) sensors and multi-parameter water quality meter, in-situ data on CH4 concentrations and associated parameters were collected from December 11, 2023, to March 26, 2024. The results indicated that the CH4 concentration decreased as tidal level increased, reaching their highest value of approximately 0.077 µmol/L (standard deviation, SD = 0.004 4) at the lowest tidal level. Diurnal variations in CH4 concentrations were observed, possibly influenced by factors like temperature and light intensity. Daytime CH4 levels (0.052 µmol/L, SD = 0.011) were higher than nighttime levels (0.047 µmol/L, SD = 0.004 9), with peas concentrations of 0.063 µmol/L (SD = 0.001 2) occurring in the mid-morning. Seasonal transition in CH4 concentrations between winter and spring were evident, with temperature being a dominant factor. The lowest CH4 levels (0.025 µmol/L, SD = 0.015) were observed in February when temperatures were lowest. Nutrient availability may enhance CH4 production. It is estimated that during a single tidal cycle, Swan Lake can release approximately 134.42 mol of CH4 into the open sea, thereby significantly reducing the blue carbon benefits of the seagrass meadows. This study provides valuable data support for global research on CH4 dynamics in seagrass ecosystems and underscores the importance of seagrass meadows in addressing climate challenges.