DOI: 10.1002/gbc.20020
Scopus记录号: 2-s2.0-84881073247
论文题名: Temperate reservoirs are large carbon sinks and small CO2 sources: Results from high-resolution carbon budgets
作者: Knoll L ; B ; , Vanni M ; J ; , Renwick W ; H ; , Dittman E ; K ; , Gephart J ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 1 起始页码: 52
结束页码: 64
语种: 英语
英文关键词: budgets
; carbon
; reservoirs
; watersheds
Scopus关键词: budgets
; Carbon budgets
; High resolution
; Inland waters
; Sediment organic carbon
; Temporal resolution
; Watershed lands
; Weather events
; Budget control
; Carbon
; Estimation
; Land use
; Petroleum reservoirs
; Reservoirs (water)
; Watersheds
; Carbon dioxide
; autotrophy
; carbon budget
; carbon dioxide
; carbon flux
; carbon sink
; reservoir
; resolution
; temperate environment
; watershed
; Ohio
; United States
英文摘要: Sediment organic carbon (C) burial and CO2 fluxes in inland waters are quantitatively important in regional and global carbon budgets. Estimates of C fluxes from inland waters are typically based on limited temporal resolution despite potential large variations with season and weather events. Further, most freshwater C budget studies have focused on natural soft-water lakes, while reservoirs and hard-water systems are globally numerous. Our study quantifies C fluxes in two hard-water, human constructed reservoirs (Ohio, USA) of contrasting watershed land use (agriculture vs. forest) using high-resolution mass balance budgets. We show that during a dry summer, C retention and export via the dam were reduced compared to a wet summer. Both reservoirs were net CO2 sources during a wet summer, but CO2 sinks during a dry summer. Despite weather-related summer differences, annual C fluxes within each reservoir were similar between years. Both reservoirs appear to be net autotrophic despite often being CO2 sources based on budgets. This is likely because CO2 fluxes in our hard-water reservoirs were more strongly associated with DIC than DOC. Using our C fluxes and statewide watershed land use, we determined the regional importance of Ohio reservoirs in OC burial and CO2 emissions. We estimate that Ohio reservoirs bury up to 4 times more OC, but emit <25% of CO2, than predicted based on their area and recent global mean estimates in lentic ecosystems. Our results provide evidence that moderately old (~50 years), temperate hard-water reservoirs are important OC sinks but contribute little to CO2 emissions. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77630
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Zoology, Program in Ecology, Evolution, and Environmental Biology, Miami University, Oxford, OH, United States; Lacawac Sanctuary, 94 Sanctuary Road, Lake Ariel, PA 18436, United States; Department of Geography, Program in Ecology, Evolution, and Environmental Biology, Miami University, Oxford, OH, United States; Department of Zoology, Miami University, Oxford, OH, United States; Department of Biology, North Carolina State University, Raleigh, NC, United States; Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States
Recommended Citation:
Knoll L,B,, Vanni M,et al. Temperate reservoirs are large carbon sinks and small CO2 sources: Results from high-resolution carbon budgets[J]. Global Biogeochemical Cycles,2013-01-01,27(1)