Comprehensive multiyear carbon budget of a temperate headwater stream
Comprehensive multiyear carbon budget of a temperate headwater stream
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DOI：
10.1002/2015jg003050
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发表时间：
2016-05-01
影响因子：
3.7
通讯作者：
Thomas, Christoph K.
中科院分区：
文献类型：
--
作者：
Argerich, Alba;Haggerty, Roy;Thomas, Christoph K.
源头河流占全球流域常年河道总长度的近 90%。它们矿化从陆地系统进入的有机碳，逃避陆地二氧化碳（CO2），并通过河流内的初级生产和呼吸产生和去除碳。尽管源头水流很重要，但在全球碳预算中常常被忽视，这主要是因为缺乏可用数据。我们在 10 年间对美国俄勒冈州西部 96 公顷森林流域的一条溪流进行了详细测量。这条河流仅占流域面积的0.4%，输出量为159kgCha(-1)yr(-1)，与全球大河流的输出量相似。河流输出主要是溶解的无机碳的下游运输(63kgCha(-1)yr(-1))和向大气中逃逸的CO2(42kgCha(-1)yr(-1))，剩下的51kgCha(-1)yr(-1)用于有机碳的下游运输(17kgCha(-1)yr(-1)和 34kgCha(-1)yr(-1)，分别以溶解形式和颗粒形式）。
Headwater streams comprise nearly 90% of the total length of perennial channels in global catchments. They mineralize organic carbon entering from terrestrial systems, evade terrestrial carbon dioxide (CO2), and generate and remove carbon through in-stream primary production and respiration. Despite their importance, headwater streams are often neglected in global carbon budgets primarily because of a lack of available data. We measured these processes, in detail, over a 10year period in a stream draining a 96ha forested watershed in western Oregon, USA. This stream, which represents only 0.4% of the watershed area, exported 159kgCha(-1)yr(-1), similar to the global exports for large rivers. Stream export was dominated by downstream transport of dissolved inorganic carbon (63kgCha(-1)yr(-1)) and by evasion of CO2 to the atmosphere (42kgCha(-1)yr(-1)), leaving the remainder of 51kgCha(-1)yr(-1) for downstream transport of organic carbon (17kgCha(-1)yr(-1) and 34kgCha(-1)yr(-1) in dissolved and particulate form, respectively).