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Dynamic controls on riverine pCO_2 and CO_2 outgassing in the Dry-hot Valley Region of Southwest China

机译：西南干热河谷地区河流pCO_2和CO_2除气的动态控制

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摘要

Inland waters frequently exhibit carbon dioxide (CO2) supersaturation and potentially serve as CO2 emitters to the atmosphere. However, study on water-air interface CO2 exchange from small rivers remains limited, which causes large uncertainty of local and global carbon budgets. Based on seasonal field measurements, carbonate equilibria (CO2SYS program) and empirical models of gas transfer velocity (k value), we investigated the CO2 partial pressure (pCO(2)), CO2 emission and its controlling factors in the Longchuan River, a subtropical river in the Dry-hot Valley Region of Southwest China. Over 88% of samples were found to be oversaturated with atmospheric CO2, and the mean pCO(2) ranged from 1497 +/- 1415 mu atm (dry period) to 1734 +/- 1648 mu atm (post-wet period). With the calibrated k values of 43.4-80.5 cm/h, the CO2 emission rates were estimate at 443-514 mmol/m(2)/day. We highlighted that long-term gully erosion enhanced the buffering capacity of carbonates in the aquatic environment and resulted in seasonal differences in riverine pCO(2). Intensive agricultural practices could alter the pCO(2) and further stimulate CO2 emissions. There were positive correlations of pCO(2)-elevation and pCO(2)-DOC in the initial-wet period but not in the dry period. This study suggests that extreme soil erosion and anthropogenic activities can regulate environmental variables and thus greatly affect the riverine CO2 outgassing. Our findings provide key insights into the understandings of dynamic controls on riverine pCO(2) and CO2 outgassing under global change.
机译：内陆水域经常表现出二氧化碳（CO2）过饱和，并有可能作为向大气中的CO2排放源。然而，关于小河流水-空气界面CO2交换的研究仍然有限，这导致了本地和全球碳预算的巨大不确定性。基于季节性现场测量，碳酸盐平衡（CO2SYS程序）和气体传输速度的经验模型（k值），我们研究了亚热带龙川河的二氧化碳分压（pCO（2）），二氧化碳排放及其控制因素西南干热河谷地区的河流。发现超过88％的样品被大气CO2过饱和，平均pCO（2）的范围从1497 +/- 1415微米大气压（干燥时期）到1734 +/- 1648微米大气压（湿后时期）。使用43.4-80.5 cm / h的校准k值，估计CO2排放速率为443-514 mmol / m（2）/天。我们强调指出，长期的沟壑侵蚀增强了碳酸盐在水生环境中的缓冲能力，并导致河流pCO（2）的季节差异。集约化农业实践可能会改变pCO（2）并进一步刺激CO2排放。在初湿时期，pCO（2）升高与pCO（2）-DOC呈正相关，而在干燥时期则没有。这项研究表明，极端的土壤侵蚀和人为活动可以调节环境变量，从而极大地影响河流的二氧化碳排放。我们的发现提供了对全球变化下对河流pCO（2）和CO2排放动态控制的理解的关键见解。

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  • 来源
    《Aquatic Sciences》 |2020年第1期|12.1-12.13|共13页
  • 作者

    Ni Maofei; Luo Jiachen; Li Siyue;

  • 作者单位

    Chinese Acad Sci CIGIT Key Lab Reservoir Aquat Environm Chongqing 400714 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China|Guizhou Minzu Univ Coll Ecoenvironm Engn Guiyang 550025 Peoples R China;

    Chinese Acad Sci CIGIT Key Lab Reservoir Aquat Environm Chongqing 400714 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci CIGIT Key Lab Reservoir Aquat Environm Chongqing 400714 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dry-hot Valley Region; CO2 outgassing; CO2 partial pressure (pCO(2)); Environmental couplings; Controlling factors; Upper Yangtze River;

    机译：干热谷地区;二氧化碳排放CO2分压（pCO（2））;环境耦合;控制因素;长江上游;

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