泛滥平原的连接性影响了河流碳排放和溶解碳运输
Y Jun Xu1, Zhen Xu2, Lee Potter3
1School of Renewable Natural Resources, Louisiana State University, Baton Rouge, LA 70803, USA; Coastal Studies Institute, Louisiana State University, Baton Rouge, LA 70803, USA.
The Science of the total environment
|March 10, 2024
概括
阿查法拉亚河 (AR),重新连接到它的洪水平原,排放的二氧化碳 (CO2) 是密西西比河 (MR) 的两倍. 这项研究强调了洪水平原重新连接对河流碳循环和大气二氧化碳排放的影响.
科学领域:
- 环境科学 环境科学
- 生物地质化学生物地质化学
- 河流生态 河流生态
背景情况:
- 河流对于将陆地材料运输和加工到海洋至关重要.
- 了解与洪水平原重新连接的工程河流中的碳转化是至关重要的.
- 阿查法拉亚河 (AR) 是密西西比河 (MR) 的一个主要流域,流经一个大型的淡水沼泽盆地.
研究的目的:
- 为了测试假设,AR的二氧化碳排放量明显高于堤封闭的MR.
- 量化碳运输和二氧化碳排放在AR和MR中的数量.
- 评估工程河流-洪平地系统中碳的生物地质化学处理.
主要方法:
- 从2019年1月到2021年12月进行的溶解CO2部分压力 (pCO2),水温,叶绿素a和其他参数的现场测量.
- 收集的水样用于溶解有机碳 (DOC) 和溶解无机碳 (DIC) 分析.
- 对AR和MR的碳和CO2排放量进行量化质量运输.
主要成果:
- 该AR表现出明显更高的pCO2水平 (平均3563μatm) 比MR (平均1931μatm).
- 与MR (241 mmol m-2 d-1) 相比,AR (486 mmol m-2 d-1) 的二氧化碳排放率翻了一番.
- 该AR具有比MR更高的DOC度和更低的叶绿素a,水温始终更高.
结论:
- 阿查法拉亚河与其广泛的洪水平原网络的重新连接导致二氧化碳排放量大幅增加.
- 这项研究提供了一个关键的现场案例,以了解重新连接工程河流及其洪水平原的生物地球化学后果.
- 这些发现对管理大型河流系统及其在全球碳循环中的作用有影响.
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