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Contrasting biogeochemical characteristics of the Oubangui River and tributaries (Congo River basin)

机译：欧班桂河与支流（刚果河盆地）的生物地球化学特征对比

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The Oubangui is a major tributary of the Congo River. We describe the biogeochemistry of contrasting tributaries within its central catchment, with watershed vegetation ranging from wooded savannahs to humid rainforest. Compared to a 2-year monitoring record on the mainstem Oubangui, these tributaries show a wide range of biogeochemical signatures, from highly diluted blackwaters (low turbidity, pH, conductivity, and total alkalinity) in rainforests to those more typical for savannah systems. Spectral analyses of chromophoric dissolved organic matter showed wide temporal variations in the Oubangui compared to spatio-temporal variations in the tributaries, and confirm that different pools of dissolved organic carbon are mobilized during different hydrological stages. δ13C of dissolved inorganic carbon ranged between −28.1‰ and −5.8‰, and was strongly correlated to both partial pressure of CO2 and to the estimated contribution of carbonate weathering to total alkalinity, suggesting an important control of the weathering regime on CO2 fluxes. All tributaries were oversaturated in dissolved greenhouse gases (CH4, N2O, CO2), with highest levels in rivers draining rainforest. The high diversity observed underscores the importance of sampling that covers the variability in subcatchment characteristics, to improve our understanding of biogeochemical cycling in the Congo Basin.
机译：欧班吉是刚果河的主要支流。我们描述了中心流域内形成对比的支流的生物地球化学，流域植被范围从树木繁茂的大草原到潮湿的雨林。与主干Oubangui上为期2年的监测记录相比，这些支流显示了广泛的生物地球化学特征，从雨林中的高稀释黑水（低浊度，pH，电导率和总碱度）到大草原系统更典型的黑水。发色溶解的有机物的光谱分析显示，与支流的时空变化相比，欧邦圭的宽广的时间变化，并证实在不同的水文阶段动员了不同的溶解有机碳库。溶解的无机碳的δ 13 C介于-28.1‰至-5.8‰之间，与CO2的分压和碳酸盐风化对总碱度的估计贡献密切相关，建议进行重要控制状况对CO2通量的影响所有支流都在溶解的温室气体（CH4，N2O，CO2）中过饱和，在排放雨林的河流中含量最高。观测到的高度多样性强调了覆盖子汇水特征变化的采样的重要性，以增进我们对刚果盆地生物地球化学循环的理解。

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