Quantifying the frequency of synchronous carbon and nitrogen export to the river network
Quantifying the frequency of synchronous carbon and nitrogen export to the river network
复制标题
量化同步碳氮输出到河网的频率
DOI:
10.1007/s10533-020-00741-z
复制
发表时间:
2021
期刊:
影响因子:
4
通讯作者:
McDowell, William H.
中科院分区:
文献类型:
--
作者:
Wymore, Adam S.;Fazekas, Hannah M.;McDowell, William H.
The biogeochemical cycles of carbon (C) and nitrogen (N) are inextricably linked for a range of reactions. For coupled reactions such as denitrification to occur, however, solutes must be found together in space and time. Using the framework of concentration-discharge (c-Q) relationships, we examine the frequency of synchronous C and N export (i.e. identical c-Q behavior) across a river network using > 5 years of high-frequency sensor data. We demonstrate that across space and time the export of C and N to a river network is asynchronous 57% of the time. The probability of simultaneous export in largely forested watersheds demonstrates little temporal structure, while in more human-impacted watersheds, we observe the highest frequency of asynchronous c-Q behavior. We discuss the implications of synchronous c-Q behavior for solute flux estimation models and develop a theoretical framework for predicting where within a landscape we expect the probability of coupled C and N reactions to be greatest. By simultaneously comparing the variability in C and N c-Q relationships we develop an integrated framework for predicting synchronous export of solutes.
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