DOI: 10.1002/2014GB004952
Scopus记录号: 2-s2.0-85027940027
论文题名: Patterns and drivers of change in organic carbon burial across a diverse landscape: Insights from 116 Minnesota lakes
作者: Dietz R ; D ; , Engstrom D ; R ; , Anderson N ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 5 起始页码: 708
结束页码: 727
语种: 英语
英文关键词: carbon burial
; catchment disturbance
; eutrophication
; lake sediments
; land use change
; paleolimnology
Scopus关键词: carbon cycle
; eutrophication
; global change
; human settlement
; lacustrine deposit
; land use change
; organic carbon
; paleolimnology
; sediment core
; Minnesota
; United States
英文摘要: Lakes may store globally significant quantities of organic carbon (OC) in their sediments, but the extent to which burial rates vary across space and time is not well described. Using 210Pb-dated sediment cores, we explored patterns of OC burial in 116 lakes spanning several ecoregions and land use regimes in Minnesota, USA during the past 150-200 years. Rates for individual lakes (across all time periods) range from 3 to 204g C m-2yr-1 (median 33g C m-2yr-1) and show strong geographic separation in accordance with the degree of catchment disturbance and nutrient enrichment. Climate and basin morphometry exercise subordinate control over OC burial patterns, and diagenetic gradients introduce little bias to estimated temporal trends. Median burial rates in agricultural lakes exceed urban lakes and have increased fourfold since Euro-American settlement. The greatest increase in OC burial occurred prior to the widespread adoption of industrial fertilizers, during an era of land clearance and farmland expansion. Northern boreal lakes, impacted by historical logging and limited cottage development yet comparatively undisturbed by human activity, bury OC at rates 3X lower than agricultural lakes and exhibit much smaller increases in OC burial. Scaling up modern OC burial estimates to the entire state, we find that Minnesota lakes annually store 0.40 Tg C in their sediments, equal to 1.5% of annual statewide CO2 emissions from fossil fuel combustion. During the period of Euro-American settlement (circa 1860-2000), cumulative OC burial amounted to 36 Tg C, 40% of which can be attributed to anthropogenic enhancement. ©2015. 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/77974
Appears in Collections: 气候变化事实与影响
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作者单位: Water Resources Science Program, University of Minnesota, Saint Paul, MN, United States; St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, MN, United States; Department of Geography, Loughborough University, Leicestershire, United Kingdom
Recommended Citation:
Dietz R,D,, Engstrom D,et al. Patterns and drivers of change in organic carbon burial across a diverse landscape: Insights from 116 Minnesota lakes[J]. Global Biogeochemical Cycles,2015-01-01,29(5)