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营养物质加载加速了海草生态系统水域中耐火溶解有机碳的分解

Xia Zhang¹, Songlin Liu², Yunchao Wu¹

¹Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.

|December 25, 2024

概括

营养物质加载加快了海草生态系统中溶解有机碳 (DOC) 的损失,降低了它们长期储存碳的能力. 较少营养丰富的环境显示出更大的碳损失,表明脆弱性.

科学领域:

海洋生态海洋生态学
生物地质化学生物地质化学
微生物生态学微生物生态学

背景情况:

海草生态系统是重要的"蓝色碳"沉积槽,以溶解有机碳 (DOC) 形式储存大量碳.
耐火DOC (RDOC) 对于长期的碳封存至关重要,微生物活动对其命运有很大影响.
营养物质负载威胁到海草的健康和碳储存,但其对调节RDOC的微生物群落的影响尚不清楚.

研究的目的:

研究营养丰富对DOC加工和海草生态系统中的微生物社区动态的影响.
了解营养负载如何影响耐火溶解有机碳 (RDOC) 的转化和封存.

主要方法:

一个300天的实验室化实验.
监测溶解有机碳 (DOC) 度和组成 (δ13C,化).
分析微生物群落组成的变化,以应对营养丰富.

主要成果:

添加营养素显著增加了DOC降解率.
在营养丰富的条件下,残留的DOC显示出更高的湿度和耗尽的δ13C.
在营养丰富下,微生物群落转向K战略家和真菌.
较低环氧化水域 (26.9%) 的RDOC下降速度较快,而高环氧化水域 (14.5%) 的下降速度较快.

结论:

高营养负载增强了RDOC的重矿化,削弱了海草生态系统的长期碳捕集潜力.
较少环保的海草生态系统可能更容易受到营养驱动的碳损失的影响.
特定的微生物种群转移与营养丰富和海草中改变的DOC处理有关.

关键词:

碳的分解碳的分解长期的潜伏时间.微生物社区的微生物社区.富含营养的营养丰富剂耐火的DOC是什么海草生态系统海草生态系统

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