Biogeochemistry of the Amazonian Floodplains: Insights from Six End-Member Mixing Models*

Earth Interactions

VincentBustillo¹ 

关键词: Amazon River;    Floodplains;    Biogeochemical cycles;    Sediment dynamics;    Diagenesis;    CO2 outgassing;   

DOI  :  10.1175/2010EI326.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

Abstract The influence of Amazonian floodplains on the hydrological, sedimentary, and biogeochemical river budget was investigated along the Vargem Grande–Óbidos reach, by applying six mixing models based on variable regional and/or variable hydrological sources. By comparing the output of many different models designed for different purposes, the nature and the magnitude of processes linking water and biogeochemical budgets of the Amazonian floodplains were clarified. This study reveals that most of the chemical baseline of the Amazon River basin is acquired before the studied 2000-km Amazonian reach. However, the tight connection between the hydrograph stage of the river and the chemical signals provides insightful information on the dynamics of its floodplains. The chemical expression of biotic and abiotic processes occurring in the Amazonian floodplains can be particularly perceived during falling waters. It appears delayed in time compared to the maximum extension of submerged area, because the alter...

【 授权许可】

Unknown