Abstract Carbon retention within river corridors influences ecosystem processes of catchments and regulates regional to global carbon budgets. Previous studies lack focus of carbon retention associated with meandering river migration. To fill the gap, this study concentrated on particulate organic carbon (POC) retention by point bars that built via hydrogeomorphic processes within meandering river corridors. We selected a typical meandering river (White River) in Zoige Basin of the Tibetan Plateau to conduct field works in the growing seasons of 2016, 2018, and 2019. We found (i) concentration of POC retained within point bars was 0.17%-2.52%, three to five times significantly lower than on general areas of floodplain, and did not show downstream trends; (ii) POC was homogeneously distributed within individual point bars, whereas the positions pioneer plants invaded had significantly higher concentrations; (iii) the order for POC concentration within the river corridor was: positions of bars without plants (1.08%)

中文翻译：

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青藏高原若尔盖盆地蜿蜒河流廊道内点棒滞留颗粒有机碳

摘要 河流走廊内的碳滞留影响流域的生态系统过程并调节区域到全球的碳预算。以前的研究缺乏对与蜿蜒河流迁移相关的碳保留的关注。为了填补这一空白，本研究集中于通过在蜿蜒的河流走廊内通过水文地貌过程建造的点状坝对颗粒有机碳 (POC) 的保留。我们选取了青藏高原若尔盖盆地一条典型的曲流河（白河）在2016年、2018年和2019年的生长季节进行田间工作。我们发现（i）点棒内保留的POC浓度为0.17%-2.52 %，明显低于泛滥平原一般地区的三到五倍，并且没有显示出下游趋势；(ii) POC 均匀分布在单个点条中，而先锋植物入侵的位置则有明显较高的浓度；(iii) 河流走廊内 POC 浓度的顺序为：没有植物的酒吧位置 (1.08%)