River ecosystem metabolism and carbon biogeochemistry in a changing world
River ecosystem metabolism and carbon biogeochemistry in a changing world
复制标题
DOI：
10.1038/s41586-022-05500-8
复制
发表时间：
2023-01
期刊：
影响因子：
64.8
通讯作者：
T. Battin;R. Lauerwald;E. Bernhardt;E. Bertuzzo;Lluís Gómez Gener;R. Hall;E. Hotchkiss;T. Maavara
中科院分区：
文献类型：
--
作者：
T. Battin;R. Lauerwald;E. Bernhardt;E. Bertuzzo;Lluís Gómez Gener;R. Hall;E. Hotchkiss;T. Maavara
河流网络是大陆、海洋和大气之间最大的地球化学联系。我们目前对河流在全球碳循环中的作用的了解仍然有限，这使得很难预测全球变化如何改变河流固碳和温室气体排放的时间和空间分布。本文综述了河流生态系统代谢的研究现状，并综合了目前河流生态系统代谢的最佳估算值。我们量化了从陆地到全球河流的有机和无机碳通量，并表明它们的净生态系统生产和二氧化碳排放将有机碳平衡转移到无机碳平衡，从陆地到沿海海洋。此外，我们还讨论了全球变化如何影响河流生态系统的代谢和相关的碳通量，并确定了研究方向，可以帮助开发更好的预测全球变化对河流生态系统过程的影响。我们认为，全球河流观测系统将发挥关键作用，了解河流网络及其未来的演变，在全球碳预算的背景下。
River networks represent the largest biogeochemical nexus between the continents, ocean and atmosphere. Our current understanding of the role of rivers in the global carbon cycle remains limited, which makes it difficult to predict how global change may alter the timing and spatial distribution of riverine carbon sequestration and greenhouse gas emissions. Here we review the state of river ecosystem metabolism research and synthesize the current best available estimates of river ecosystem metabolism. We quantify the organic and inorganic carbon flux from land to global rivers and show that their net ecosystem production and carbon dioxide emissions shift the organic to inorganic carbon balance en route from land to the coastal ocean. Furthermore, we discuss how global change may affect river ecosystem metabolism and related carbon fluxes and identify research directions that can help to develop better predictions of the effects of global change on riverine ecosystem processes. We argue that a global river observing system will play a key role in understanding river networks and their future evolution in the context of the global carbon budget.