Peatlands play an important role in global carbon cycling, as they act as a natural sink of carbon dioxide (CO) or as a source of methane (CH). The influence of microtopography (lawns and hummock-hollow complexes) in the biogeochemical dynamics of dissolved organic and inorganic carbon (DOC and DIC) and dissolved CH and CO is generally miss-considered. Southernmost Patagonia has huge areas of pristine peatlands, which are still in a largely natural state with scarce anthropogenic influence. In this study we provide foundational insights into the dynamics of greenhouse gasses (GHGs) and DOC in dominated peatlands of Southern Patagonia, assessing the impact of microtopography on these dynamics. The stocks of dissolved GHGs and DOC in hummock-hollows complex and lawns were analysed at three depths (25, 50, and 75 cm) in four ombrotrophic peatbogs. CH, NO and CO fluxes, net ecosystem exchange (NEE) and gross primary productivity (GPP) were also studied. CO and CH fluxes were strongly affected by microtopography. Hummock-hollows showed higher CO fluxes, and temperature and radiation were the main drivers for respiration and GPP, respectively. In addition, in this microtopography, higher DOC concentrations were observed at the top depth. In contrast, lawns acted as a source of CH, with higher emission rates and high dissolved GHGs concentration throughout the depth profile.

中文翻译：

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巴塔哥尼亚泥炭沼微地形对温室气体通量和孔隙水中溶解碳的影响

泥炭地在全球碳循环中发挥着重要作用，因为它们是二氧化碳 (CO) 的天然汇或甲烷 (CH) 的来源。微地形（草坪和丘状空心复合体）对溶解的有机和无机碳（DOC 和 DIC）以及溶解的 CH 和 CO 的生物地球化学动力学的影响通常被错误地考虑。最南端的巴塔哥尼亚拥有大片原始泥炭地，这些泥炭地基本上仍处于自然状态，几乎没有人为影响。在这项研究中，我们提供了对南巴塔哥尼亚主要泥炭地温室气体 (GHG) 和 DOC 动态的基础见解，评估了微地形对这些动态的影响。在四个软营养泥炭沼泽的三个深度（25、50 和 75 厘米）处分析了丘丘空心复合体和草坪中溶解的 GHG 和 DOC 的存量。还研究了 CH、NO 和 CO 通量、净生态系统交换 (NEE) 和总初级生产力 (GPP)。CO 和 CH 通量受到微地形的强烈影响。丘陵显示出较高的二氧化碳通量，温度和辐射分别是呼吸和 GPP 的主要驱动因素。此外，在该微地形中，在顶部深度观察到较高的 DOC 浓度。相比之下，草坪是 CH 的来源，在整个深度剖面上具有较高的排放率和较高的溶解温室气体浓度。