Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland.
Isotope Bioscience Laboratory, Department of Green Chemistry and Technology, Ghent University, Ghent, Belgium.
Nat Commun. 2022 Jan 17;13(1):330. doi: 10.1038/s41467-022-27978-6.
Globally, tropical forests are assumed to be an important source of atmospheric nitrous oxide (NO) and sink for methane (CH). Yet, although the Congo Basin comprises the second largest tropical forest and is considered the most pristine large basin left on Earth, in situ NO and CH flux measurements are scarce. Here, we provide multi-year data derived from on-ground soil flux (n = 1558) and riverine dissolved gas concentration (n = 332) measurements spanning montane, swamp, and lowland forests. Each forest type core monitoring site was sampled at least for one hydrological year between 2016 - 2020 at a frequency of 7-14 days. We estimate a terrestrial CH uptake (in kg CH-C ha yr) for montane (-4.28) and lowland forests (-3.52) and a massive CH release from swamp forests (non-inundated 2.68; inundated 341). All investigated forest types were a NO source (except for inundated swamp forest) with 0.93, 1.56, 3.5, and -0.19 kg NO-N ha yr for montane, lowland, non-inundated swamp, and inundated swamp forests, respectively.
全球范围内，热带森林被认为是大气中氧化亚氮（NO）的重要来源和甲烷（CH）的汇。然而，尽管刚果盆地拥有第二大热带雨林，并且被认为是地球上现存的最原始的大型盆地，但实地测量的氮和甲烷通量却很少。在这里，我们提供了多年来的地面土壤通量（n=1558）和河流溶解气体浓度（n=332）测量数据，涵盖了山地、沼泽和低地森林。每个森林类型核心监测站点在 2016 年至 2020 年期间至少进行了一个水文年的采样，频率为 7-14 天。我们估计山地（-4.28）和低地森林（-3.52）的陆地 CH 吸收量（以 kg CH-C ha yr 计），以及沼泽森林（非淹没区 2.68；淹没区 341）大量的 CH 释放。所有调查的森林类型都是氮的源（淹没沼泽森林除外），其氮的通量分别为山地、低地、非淹没沼泽和淹没沼泽森林 0.93、1.56、3.5 和-0.19 kg NO-N ha yr。
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