Coupled effects of hydrology and temperature on temporal dynamics of dissolved carbon in the Min River, Tibetan Plateau
Coupled effects of hydrology and temperature on temporal dynamics of dissolved carbon in the Min River, Tibetan Plateau
复制标题
青藏高原岷江水温耦合对溶解碳时间动态的影响
DOI：
10.1016/j.jhydrol.2020.125641
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发表时间：
2020-10
影响因子：
6.4
通讯作者：
Si-Liang Li
中科院分区：
文献类型：
--
作者：
Shuai Chen;Jun Zhong;Cai Li;Jing Liu;Wanfa Wang;Sen Xu;Si-Liang Li
研究河流溶解碳的时间动态和通量对于理解不同气候条件下区域和全球碳循环至关重要。本文以青藏高原岷江为研究对象，研究了不同水文条件下溶解无机碳（DIC）和溶解有机碳（DOC）的行为和通量。DIC浓度随径流量的增加而降低，部分反映了稀释效应，这可能归因于流体通过时间的缩短，从而减少了与岩石的接触时间。DOC浓度与径流量呈显著正相关，这可能是由于强烈的冲刷作用使大量土壤有机碳流入河流所致。δ 13 CDIC与径流量呈负相关关系，可能与丰水期土壤CO2流入和有机质降解有关。在亚洲季风区，由于高温加速了DIC的产生速率，因此ΔDIC（DIC随水文条件变化的产生量）与水温有很强的正相关关系。闽江的DIC/DOC比值平均为15.09，DOC和DIC通量分别为1.1和15.2 t C km− 2 yr −1。DOC和DIC通量随径流量的变化而变化较大，表明水文条件是影响溶解碳输出变化的关键因素。研究表明，青藏高原河流碳动态受短期气候变化的影响较大，这对认识未来气候变化下的全球碳循环具有重要意义。
Studying the temporal dynamics and fluxes of riverine dissolved carbon is crucial in understanding the regional and global carbon cycles under various climatic conditions. Here, we studied the behaviors and fluxes of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC) responding to various hydrologic conditions in the Min River, originated from Tibetan Plateau. The DIC concentrations decreased with increasing runoff, partially reflecting dilution effect, which may be ascribed to the shortened fluid transit time and then the reduced contact time with rocks. Nevertheless, DOC concentrations were positively correlated with runoff, which can be attributed to that a large amount of soil organic carbon flowed into the river as a result of the strong flushing effect. The negative relationship between δ13CDICand runoff could be explained by soil CO2influx and organic matter degradation during the high flow season. ΔDIC (the production of DIC with changing hydrologic conditions) had a strong positive correlation with water temperature due to the accelerated DIC production rates by high temperature, which always co-varied with intense precipitation in Asian monsoonal regions. The mean DIC/DOC ratio in the Min River was 15.09, and the DOC and DIC fluxes were 1.1 and 15.2 t C km−2yr−1, respectively, for the studied year. And the DOC and DIC fluxes varied dramatically with runoff changes, suggesting that hydrologic conditions were critical factors for the variations in dissolved carbon export. This study shows that carbon dynamics of rivers draining from the Tibetan Plateau are greatly affected by short-term climatic variabilities, which has implications for understanding global carbon cycle under future climate change.
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影响因子：
4.6
作者：
Zhong J;Li SL;Tao F;Yue F;Liu CQ
通讯作者：
Liu CQ
影响因子：
5.4
作者：
Y. Mei;G. Hornberger;L. Kaplan;J. Newbold;A. Aufdenkampe
通讯作者：
Y. Mei;G. Hornberger;L. Kaplan;J. Newbold;A. Aufdenkampe
DOI：
10.1007/s11270-006-9186-y
发表时间：
2007-01
期刊：
Water, Air, and Soil Pollution
影响因子：
--
作者：
Xiao-dong Li;H. Masuda;K. Koba;Hai-Ao Zeng
通讯作者：
Xiao-dong Li;H. Masuda;K. Koba;Hai-Ao Zeng
影响因子：
2.8
作者：
Songjie He;Y. Xu
通讯作者：
Songjie He;Y. Xu
影响因子：
3.9
作者：
K. Telmer;J. Veizer
通讯作者：
K. Telmer;J. Veizer