溶解氧与温度波动对河口湿地碳组分的协同调控作用OA
Synergistic Regulation of Carbon Fractions by Dissolved Oxygen and Temperature Fluctuations in Estuarine Wetlands
通过室内培养实验,探究了长江口湿地沉积物在不同溶解氧(8、2 mg·L-1)与温度(23、25、27℃)条件下的碳组分动态变化.结果表明:温度与氧气浓度升高促进了沉积物有机碳矿化,活性碳库显著下降;低温和缺氧抑制了沉积物碳分解,对沉积物有机碳矿化能力影响显著.正常氧条件下,沉积物呼吸的温度敏感性(Q10)更高,表明好氧环境的温度增强了有机碳矿化对温度变化的响应.铁结合有机碳占比在缺氧环境中显著高于正常氧环境,表明溶解氧对碳的稳定性具有重要影响.
This study investigated the dynamics of carbon fractions in sediments of the Yangtze River Estuary wetlands through laboratory incubation experiments under varying dissolved oxygen(8 mg·L-1 normoxic vs.2 mg·L-1 hypoxic)and temperature(23,25,and 27℃)conditions.The results showed that elevated temperature and higher oxygen availability promoted the mineralization of sediment organic carbon,leading to significant reductions in labile carbon pools,whereas low temperature and hypoxia suppressed carbon decomposition and markedly constrained the mineraliza-tion capacity of sediment organic carbon.The temperature sensitivity(Q10)of sediment respiration was substantially higher under normoxic conditions,indicating that aerobic environments amplify the responsiveness of organic carbon mineralization to temperature variations.The proportion of iron-bound organic carbon was significantly higher under hypoxic than normoxic conditions,highlighting the critical role of dissolved oxygen in regulating carbon stability.
杜光月;宋振阳;冉佳丽;沈彦麒;郭萍萍;李小飞
华东师范大学河口海岸全国重点实验室,上海 200241华东师范大学河口海岸全国重点实验室,上海 200241华东师范大学河口海岸全国重点实验室,上海 200241华东师范大学河口海岸全国重点实验室,上海 200241福建闽江河口湿地国家级自然保护区管理处,福建闽江河口湿地生态系统国家定位观测研究站,福建 福州 350200华东师范大学河口海岸全国重点实验室,上海 200241
资源环境
溶解氧温度有机碳组分有机碳矿化温度敏感性湿地长江口
dissolved oxygentemperatureorganic carbon fractionsorganic carbon minerali-zationtemperature sensitivity(Q10)wetlandYangtze Estuary
《福建师范大学学报（自然科学版）》 2026 (3)
1-9,9
国家自然科学基金项目(42271101)福建闽江河口湿地国家级自然保护区管理处项目(MJHKSD20230602)
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