期刊
LIMNOLOGY AND OCEANOGRAPHY
卷 58, 期 3, 页码 849-866出版社
WILEY
DOI: 10.4319/lo.2013.58.3.0849
关键词
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资金
- Research Coordination Network grant from the U.S. National Science Foundation (NSF)
- Gordon and Betty Moore Foundation
- U.S. NSF Integrative Graduate Education and Research Traineeship [0903560]
- Long-Term Research in Environmental Biology [0743192]
- Archbold Biological Station
- U.S. NSF [0446017, 0639229, 0822700, OCI-0936174]
- Gordon and Betty Moore Foundation [1182, 2735]
- Irish Marine Institute
- Danish Centre for Lake Restoration and Danish Council for Independent Research, Natural Sciences [272-05-0277, 10-085238]
- Hancock Biological Station long-term monitoring program
- U.S. NSF Experimental Program to Stimulate Competitive Research [0918856]
- long-term research program at the Leibniz-Instutite of Freshwater Ecology and Inland Fisheries in Berlin, Germany
- U.S. Environmental Protection Agency, Environmental Monitoring for Public Access and Community Tracking
- Louisiana Universities Marine Consortium, Environmental Monitoring Program
- New Zealand Ministry of Science and Innovation [UOWX0505]
- Bay of Plenty Regional Council
- Lake Sunapee Protective Association
- Division of Biological Infrastructure [0434684, 0842125]
- Estonian Science Foundation [8729]
- Estonian target funding project [SF 0170011508]
- Academia Sinica
- Direct For Biological Sciences
- Emerging Frontiers [0446017, 0842125] Funding Source: National Science Foundation
- Direct For Education and Human Resources
- Division Of Graduate Education [0903560] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [1144683, 822700, 1255159] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [1144624, 0941510, 0743192] Funding Source: National Science Foundation
- Div Of Biological Infrastructure
- Direct For Biological Sciences [0639229] Funding Source: National Science Foundation
- Div Of Biological Infrastructure
- Direct For Biological Sciences [0434684] Funding Source: National Science Foundation
- Office Of The Director
- EPSCoR [0918856] Funding Source: National Science Foundation
We assembled data from a global network of automated lake observatories to test hypotheses regarding the drivers of ecosystem metabolism. We estimated daily rates of respiration and gross primary production (GPP) for up to a full year in each lake, via maximum likelihood fits of a free-water metabolism model to continuous high-frequency measurements of dissolved oxygen concentrations. Uncertainties were determined by a bootstrap analysis, allowing lake-days with poorly constrained rate estimates to be down-weighted in subsequent analyses. GPP and respiration varied considerably among lakes and at seasonal and daily timescales. Mean annual GPP and respiration ranged from 0.1 to 5.0 mg O-2 L-1 d(-1) and were positively related to total phosphorus but not dissolved organic carbon concentration. Within lakes, significant day-to-day differences in respiration were common despite large uncertainties in estimated rates on some lake-days. Daily variation in GPP explained 5% to 85% of the daily variation in respiration after temperature correction. Respiration was tightly coupled to GPP at a daily scale in oligotrophic and dystrophic lakes, and more weakly coupled in mesotrophic and eutrophic lakes. Background respiration ranged from 0.017 to 2.1 mg O-2 L-1 d(-1) and was positively related to indicators of recalcitrant allochthonous and autochthonous organic matter loads, but was not clearly related to an indicator of the quality of allochthonous organic matter inputs.
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