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
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量化同步碳氮输出到河网的频率

DOI:
10.1007/s10533-020-00741-z
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发表时间:
2021
期刊:
影响因子:
4
通讯作者:
McDowell, William H.
McDowell, William H.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Wymore, Adam S.;Fazekas, Hannah M.;McDowell, William H.

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碳(C)和氮(N)的地球化学循环在一系列反应中密不可分。然而,要使反硝化等耦合反应发生,溶质必须在空间和时间上同时存在。使用浓度-流量(c-Q)关系的框架,我们使用> 5年的高频传感器数据检查跨河流网络的同步C和N输出(即相同的c-Q行为)的频率。我们证明,在空间和时间的出口的C和N的河流网络是异步的57%的时间。同时出口的概率在很大程度上森林流域表现出时间结构小,而在更多的人类影响的流域,我们观察到的异步C-Q行为的频率最高。我们讨论了溶质通量估计模型的同步C-Q行为的影响,并开发了一个理论框架,用于预测在景观中,我们预计耦合C和N反应的概率是最大的。通过同时比较C和N的C-Q关系的变化,我们开发了一个综合框架,用于预测溶质的同步出口。
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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