在经历海平面加速变化的沿海湿地中对比有机碳呼吸道
P Owen Clower1, Kanchan Maiti1, Marshall Bowles2
1Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA, USA.
The Science of the total environment
|July 26, 2024
概括
沿海湿地通过微生物呼吸驱动碳循环,产生无机碳 (DIC). 这项研究量化了和盐沼地的呼吸道,揭示了不同沼泽类型对DIC生产的不同贡献.
科学领域:
- 环境科学 环境科学
- 微生物生态学 微生物生态学
- 生物地质化学生物地质化学
背景情况:
- 沿海湿地土壤的碳循环受微生物活动和孔水化学的影响.
- 有机碳通过有氧和无氧呼吸的矿化产生无机碳 (DIC).
- 来自沿海湿地的DIC出口是全球碳循环的一个重要因素.
研究的目的:
- 确定各种呼吸道对季节性DIC生产的相对贡献.
- 为了比较DIC生产在对比的盐和盐沼.
- 为密西西比河三角洲平原提供基线数据,该地区面临着重大环境变化.
主要方法:
- 对各种呼吸道的同时估计.
- 测量溶解无机碳 (DIC) 流量.
- 来自不同微生物途径的有机物 (OM) 呼吸贡献量的量化.
主要成果:
- DIC流量因季节性变化而有所不同,对于这两种沼泽类型来说,夏季的流量比冬季更高.
- 在盐沼泽中,铁减少 (61.13-81.97%) 和有氧呼吸 (17.91-35.21%) 是主导的.
- 在盐沼中,有氧呼吸 (37.91-83.93%) 和硫酸盐减少 (15.87-62.04%) 是导致DIC产生的主要因素.
结论:
- 促成DIC产生的呼吸道在盐和盐沼之间有很大的差异.
- 了解这些途径对于预测沿海湿地的碳循环变化至关重要.
- 需要进一步的研究来评估相对海平面上升和盐度变化对这些过程的影响.
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