Isotope Constraints on the Sources of Particulate Organic Carbon in a Subtropical Deep Reservoir
Journal
Journal of Geophysical Research: Biogeosciences
Journal Volume
125
Journal Issue
1
Date Issued
2020
Author(s)
Abstract
Reservoirs are active sites in the terrestrial environment in terms of carbon transformation and storage. Continuous reservoir construction reinforces the importance of such artificial storage; however, knowledge pertaining to the sources, cycling, and preservation of autochthonous/allochthonous particulate organic carbon (POC) in reservoirs remains incomplete. We monitored the flux and carbon isotope composition of sinking particles in a subtropical deep reservoir, and the results were compared with the isotopic signatures of potential POC sources (soil) and the sedimentary sink. We found that the typhoon-induced POC flux was transported laterally at intermediate water depths within the reservoir and that it contributed more than 70% of the annual deposition. An isotope ternary mixing model showed that over 87% of the POC preserved in sediments was allochthonous. Although the autochthonous POC from primary production was preferentially degraded, the preserved autochthonous POC (42 ± 14 gC m?2 yr?1) was comparable to the observed carbon dioxide uptake (35 gC m?2 yr?1) by the reservoir, suggesting a high efficiency of carbon preservation in subtropical deep reservoirs. ?2020. American Geophysical Union. All Rights Reserved.
Subjects
autochthon; carbon dioxide; carbon isotope; carbon sequestration; intermediate water; mixing; particulate organic carbon; primary production; sedimentary sequence; terrestrial environment
Type
journal article