潮驱动的N2O排放比CH4更强烈地抵消了在红树林生态系统中的年度碳捕集
Chunwei Fu1, Zhibo Shen1, Shiheng Tang1
1State Key Laboratory of Marine Resource Utilization in South China Sea, School of Ecology, School of Marine Science and Engineering, Hainan University, Haikou, Hainan, China.
The Science of the total environment
|January 23, 2025
概括
红树林生态系统储存蓝色碳,但也释放温室气体 (GHG). 这项研究量化了中国东江红树林的温室气体排放量,发现它们抵消了8.7%的碳捕获,突出了测量所有温室气体的必要性.
科学领域:
- 环境科学 环境科学
- 海洋生态海洋生态学
- 气候变化科学 气候变化科学
背景情况:
- 红树林生态系统对于蓝色碳的储存至关重要,对于缓解气候变化至关重要.
- 这些生态系统也是温室气体 (GHG) 的重要来源,包括二氧化碳 (CO2),甲 (CH4) 和氧化 (N2O).
- 碳化合物和N2O排放对弥补红树林碳效益的贡献需要进一步量化.
研究的目的:
- 为了研究温室气体及其流动在中国最大的红树林生态系统,Dongzhaigang (DZG) 湾的空间和时间分布.
- 了解温室气体排放的控制因素,包括潮影响和生物地球化学过程.
- 准确评估红树林生态系统的净碳捕集能力,包括非二氧化碳温室气体.
主要方法:
- 利用36小时时间序列观测和绘图巡航收集数据.
- 在潮和月度尺度上分析了CO2,CH4和N2O流的空间和时间变化.
- 研究了盐度,潮驱动的孔水外流和沉积物再悬浮对温室气体动态的影响.
主要成果:
- 潮溪的温室气体排放量很大,范围为669-39,000gCO2等价/m2/年,其中CO2占主导地位 (88-91%).
- 甲 (CH4) 和氧化 (N2O) 的排放量分别为8-366和59-2260克二氧化碳当量/m2/年.
- 随着盐度的增加,CH4排放量显著下降,而N2O水平与化和脱化过程有关. 非二氧化碳温室气体抵消了每年红树林碳捕获的8.7%,其中N2O是主要贡献者 (7.4%).
结论:
- 潮动力学,包括水的混合和排放,显著影响了红树林生态系统中的温室气体分布和流动.
- 通过孔水外流和河流输入的溶解温室气体的横向出口是将温室气体释放到周围水域的关键途径.
- 准确评估红树林蓝色碳容量需要同时量化所有主要温室气体,特别是CH4和N2O.
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