Is the subarctic landscape still a carbon sink? Evidence from a detailed catchment balance
Is the subarctic landscape still a carbon sink? Evidence from a detailed catchment balance
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DOI：
10.1002/2015gl066970
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发表时间：
2016-03-16
影响因子：
5.2
通讯作者：
Karlsson, Jan
中科院分区：
文献类型：
--
作者：
Lundin, Erik J.;Klaminder, Jonatan;Karlsson, Jan
气候变暖提出了一个问题，即高纬度景观是否仍然起着净碳（C）汇的作用。通过编制一个综合的碳平衡的一个深入研究的亚北极集水区，我们表明，这个集水区的碳平衡是不太可能是一个强大的电流汇的C，一个普遍持有的假设。事实上，更有可能（71%的概率），研究集水区作为一个C源（-1120 gCm（-2）yr（-1））。对单个通量的分析表明，土壤和水生碳损失抵消了其他景观成分（例如，泥炭地和地上森林生物量）。我们的研究结果强调了充分集成的集水区碳平衡估计的重要性，并强调了高地土壤的重要性，以及它们与集水区碳平衡的水生网络的相互作用。
Climate warming raises the question whether high-latitude landscape still function as net carbon (C) sinks. By compiling an integrated C balance for an intensely studied subarctic catchment, we show that this catchment's C balance is not likely to be a strong current sink of C, a commonly held assumption. In fact, it is more plausible (71% probability) that the studied catchment functions as a C source (-1120gCm(-2)yr(-1)). Analyses of individual fluxes indicate that soil and aquatic C losses offset C sequestering in other landscape components (e.g., peatlands and aboveground forest biomass). Our results stress the importance of fully integrated catchment C balance estimates and highlight the importance of upland soils and their interaction with the aquatic network for the catchment C balance.