Regional-scale lateral carbon transport and CO 2 evasion in temperate stream catchments
Regional-scale lateral carbon transport and CO 2 evasion in temperate stream catchments
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DOI：
10.5194/bg-14-5003-2017
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发表时间：
2017-11
期刊：
影响因子：
4.9
通讯作者：
Katrin Magin;Celia Somlai-Haase;R. Schäfer;A. Lorke
中科院分区：
文献类型：
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作者：
Katrin Magin;Celia Somlai-Haase;R. Schäfer;A. Lorke
抽象。内陆沃茨通过运输、加工和排放大量的碳，在区域乃至全球规模的碳循环中发挥着重要作用，而这些碳主要来自其集水区。在这项研究中，我们分析了陆地净初级生产力（NPP）和碳从温带河流网络的集水区输出的速度之间的关系。分析包括200多个集水区在西南部德国，大小从0.8到889平方公里，其中CO2逃逸流表面和下游运输流排放量估计从水质监测数据，而净初级生产力的集水区是从一个全球数据集的基础上遥感。我们发现，平均13.9 g C m−2 yr−1（相当于陆地NPP的2.7%）通过溪流和河流从集水区输出，其中CO2逃逸和下游运输对该通量的贡献大致相等。研究区集水区的平均碳通量在许多方面与全球和大尺度纬向平均值相似，包括NPP、河流规避和河流网络中每个集水区的碳输出。对碳循环中水陆耦合的现有研究进行的审查表明，尽管研究区域的空间尺度和水文特征各不相同，但每个集水区的碳输出变化范围相对较小。
Abstract. Inland waters play an important role in regional to global-scale carbon cycling by transporting, processing and emitting substantial amounts of carbon, which originate mainly from their catchments. In this study, we analyzed the relationship between terrestrial net primary production (NPP) and the rate at which carbon is exported from the catchments in a temperate stream network. The analysis included more than 200 catchment areas in southwest Germany, ranging in size from 0.8 to 889 km2 for which CO2 evasion from stream surfaces and downstream transport with stream discharge were estimated from water quality monitoring data, while NPP in the catchments was obtained from a global data set based on remote sensing. We found that on average 13.9 g C m−2 yr−1 (corresponding to 2.7 % of terrestrial NPP) are exported from the catchments by streams and rivers, in which both CO2 evasion and downstream transport contributed about equally to this flux. The average carbon fluxes in the catchments of the study area resembled global and large-scale zonal mean values in many respects, including NPP, stream evasion and the carbon export per catchment area in the fluvial network. A review of existing studies on aquatic–terrestrial coupling in the carbon cycle suggests that the carbon export per catchment area varies in a relatively narrow range, despite a broad range of different spatial scales and hydrological characteristics of the study regions.