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The impacts of '05.6' extreme flood event on riverine carbon fluxes in Xijiang River

机译：“ 05.6”特大洪水事件对西江河流碳通量的影响

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摘要

An extreme flood event with a frequency of nearly 200 year occurred in June of 2005 in the Xijiang River, the main trunk stream of the Zhujiang River. Samples were systematically collected during the flood event, and water quality parameters, including total suspended sediment (TSS), dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), and particulate organic carbon (POC) were analyzed, and riverine carbon concentrations associated with its changing pattern through the flood process were discussed. These parameters reflect the changes in basin surface flow and subsurface flow during the flood. This flood event influenced annual flux estimations of POC, DOC, and DIC to great extents. Based on carbon flux estimations for the year 2005 and the flood event (June 21-28) in the Xijiang River, it was found that DIC, DOC, and POC fluxes during '05.6' flood event are 1.52 x 10~6g.km~(-2).a~(-1), 0.24 x 10~6 g.km~(-2).a~(-1), and 0.54 x 10~6 g.km~(-2).a~(-1), and account for 14.87%, 24.75% and 44.89% of the annual fluxes in 2005, respectively. The results suggested that carbon exports during extreme flood events had great contributions to the total carbon fluxes and composition of various carbon components, being important for accurate estimates of annual carbon fluxes in rivers with frequent floods.
机译：2005年6月，珠江干流西江发生了一次近200年的特大洪灾。在洪水期间系统地收集了样本，并分析了水质参数，包括总悬浮沉积物（TSS），溶解性无机碳（DIC），溶解性有机碳（DOC）和颗粒有机碳（POC），以及河流碳浓度讨论了洪水过程中与其变化模式有关的问题。这些参数反映了洪水期间流域地表流和地下流的变化。此洪水事件在很大程度上影响了POC，DOC和DIC的年度通量估算。根据2005年的碳通量估算值和6月21日至28日的西江洪水事件，发现“ 05.6”洪水事件期间DIC，DOC和POC通量为1.52 x 10〜6g.km〜 （-2）.a〜（-1），0.24 x 10〜6 g.km〜（-2）.a〜（-1）和0.54 x 10〜6 g.km〜（-2）.a〜 （-1），分别占2005年年通量的14.87％，24.75％和44.89％。结果表明，极端洪水事件期间的碳出口对总碳通量和各种碳成分的组成有很大的贡献，对于准确估算频繁洪水的河流中的年度碳通量非常重要。

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