autotrophy
; Boreal Kingdom
; carbon cycle
; carbon dioxide
; greenhouse gas
; lacustrine environment
; metabolism
; net primary production
; respiration
英文摘要:
Lake CO2 emissions are increasingly recognized as an important component of the global CO2 cycle, yet the origin of these emissions is not clear, as specific contributions from metabolism and in-lake cycling, versus external inputs, are not well defined. To assess the coupling of lake metabolism with CO2 concentrations and fluxes, we estimated steady state ratios of gross primary production to respiration (GPP:R) and rates of net ecosystem production (NEP = GPP-R) from surface water O2 dynamics (concentration and stable isotopes) in 187 boreal lakes spanning long environmental gradients. Our findings suggest that internal metabolism plays a dominant role in regulating CO2 fluxes in most lakes, but this pattern only emerges when examined at a resolution that accounts for the vastly differing relationships between lake metabolism and CO2 fluxes. Fluxes of CO2 exceeded those from NEP in over half the lakes, but unexpectedly, these effects were most common and typically largest in a subset (~30% of total) of net autotrophic lakes that nevertheless emitted CO2. Equally surprising, we found no environmental characteristics that distinguished this category from the more common net heterotrophic, CO2 outgassing lakes. Excess CO2 fluxes relative to NEP were best predicted by catchment structure and hydrologic properties, and we infer from a combination of methods that both catchment inputs and internal anaerobic processes may have contributed this excess CO2. Together, our findings show that the link between lake metabolism and CO2 fluxes is often strong but can vary widely across the boreal biome, having important implications for catchment-wide C budgets. �2016. American Geophysical Union. All Rights Reserved.
Groupe de Recherche Interuniversitaire en Limnologie, D�partement des Sciences Biologiques, Universit� du Qu�bec � Montr�al, Montreal, QC, Canada; Now at the School of Environmental and Forest Sciences, College of the Environment, University of Washington, Seattle, WA, United States
Recommended Citation:
Bogard M,J,, del Giorgio P,et al. The role of metabolism in modulating CO2 fluxes in boreal lakes[J]. Global Biogeochemical Cycles,2016-01-01,30(10)