变暖和河流排放加快了沿海异质变化,增加了溶解的有机物反性
Yu Wang1,2,3, Qiongqiong Yang1,2,4, Jiaxin Chen1,2
1State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Institute of Marine Microbes and Ecospheres, Xiamen University, Xiamen 361102, PR China.
Environmental science & technology
|February 5, 2026
概括
气候变暖增加了沿海海湾的不稳定溶解有机物 (LDOM) 和微生物加工. 强化河流排放产生反抗性的DOM (RDOM),改变碳循环并减少蓝色碳的潜力.
科学领域:
- 海洋微生物生态学
- 生物地质化学生物地质化学
- 沿海海洋学研究
背景情况:
- 亚热带沿海湾对于陆地与海洋的碳交换至关重要.
- 气候变暖和河流排放量增加对这些碳流的影响尚不清楚.
研究的目的:
- 研究亚热带海湾中微生物碳循环如何应对并发变暖和加剧河流排放.
- 开发一个框架,以了解沿海碳汇的脆弱性.
主要方法:
- 在门湾十年的月度观测.
- 流量细胞计,高通量测序,FT-ICR MS和NanoSIMS碳追踪的整合.
- 温度和河流输入的实验操纵.
主要成果:
- 变暖 (+4°C) 增加了植物浮游生物 (Synechococcus,微核糖藻类) 和不稳定的溶解有机物 (LDOM) 产量.
- 高温 (30°C与22°C相比) 导致异构菌对植物浮游生物碳的同化增加了5倍.
- 强化河流排放引入了强硬的溶解有机物 (RDOM),降低了DOM的生物可用性并改变了其组成.
- 结合的压力加快了碳处理,并降低了持久DOM与反复性溶解黑碳的比率.
结论:
- 双DOM强迫框架整合了热 (LDOM) 和水文 (RDOM) 驱动器.
- 该框架解释了这些驱动因素如何调节微生物碳处理,DOM持久性和沿海碳捕获.
- 沿海的蓝色碳汇容易受到同时的变暖和改变的河流排放的影响.
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