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Enhanced middle Holocene organic carbon burial in tropical floodplain lakes of the Pantanal (South America)
Journal of Paleolimnology ( IF 2.1 ) Pub Date : 2020-10-09 , DOI: 10.1007/s10933-020-00159-5
Giliane G. Rasbold , Michael M. McGlue , José C. Stevaux , Mauro Parolin , Aguinaldo Silva , Ivan Bergier

Wetland carbon storage is an important and environmentally sensitive ecosystem service. Carbon burial in the floodplain lakes of the Pantanal (tropical South America) appears to have varied during the late Quaternary, but several paleolimnological studies have recorded unusually high sediment organic carbon content from ~ 7.3 to 6.0 cal kyr BP in lakes connected to the Upper Paraguay River. We conducted a multi-indicator (phytoliths, sponge spicules, and geochemistry) study of a sediment core from Lake Cáceres (Bolivia), and found evidence for enhanced organic carbon burial during the middle Holocene that provides insights into the flooding history of the Upper Paraguay River. δ13Corg and C/N data suggest that organic matter deposited at that time in Lake Cáceres was from macrophytes. Similar datasets from three other floodplain lakes are consistent with this finding. We suggest that enhanced carbon burial occurred when lake levels declined under relatively dry climate conditions, which increased the littoral area at the expense of open water and captured floating macrophyte islands. This study sheds new light on hydroclimate controls on carbon cycling in the Pantanal wetlands, and improves interpretations of geochemical measures on bulk organic matter in floodplain lake cores.

中文翻译:

潘塔纳尔湿地(南美洲)热带泛滥平原湖泊中全新世中增强的有机碳埋藏

湿地碳储存是一种重要且对环境敏感的生态系统服务。潘塔纳尔湿地(热带南美洲)的漫滩湖泊中的碳埋藏在第四纪晚期似乎发生了变化,但几项古湖泊学研究记录了与巴拉圭上游相连的湖泊中沉积物有机碳含量异常高,从~7.3 到 6.0 cal kyr BP河。我们对卡塞雷斯湖(玻利维亚)的沉积岩芯进行了多指标(植硅体、海绵针状体和地球化学)研究,并发现了全新世中期有机碳埋藏增强的证据,为了解上巴拉圭的洪水历史提供了见解河。δ13​​Corg 和 C/N 数据表明,当时在卡塞雷斯湖沉积的有机质来自大型植物。来自其他三个洪泛区湖泊的类似数据集与这一发现一致。我们认为,当湖泊水位在相对干燥的气候条件下下降时,碳埋藏会增加,这增加了沿海面积,但牺牲了开放水域和捕获漂浮的大型植物岛屿。这项研究为潘塔纳尔湿地碳循环的水文气候控制提供了新的思路,并改进了对泛滥平原湖芯中大量有机物质的地球化学测量的解释。
更新日期:2020-10-09
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