期刊
GLOBAL BIOGEOCHEMICAL CYCLES
卷 27, 期 2, 页码 347-362出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/gbc.20034
关键词
river exports; POC; DOC; DIC; natural controls; anthropogenic controls
资金
- National Science Foundation's Integrated Carbon Cycle Research Program grant [EAR-0403949]
- Chemical Oceanography Program [OCE-0327423, OCE-0961860]
- Division Of Ocean Sciences
- Directorate For Geosciences [0961860] Funding Source: National Science Foundation
Riverine exports of carbon (C) and organic matter (OM) are regulated by a variety of natural and anthropogenic factors. Understanding the relationships between these various factors and C and OM exports can help to constrain global C budgets and allow assessment of current and future anthropogenic impacts on both riverine and global C cycles. We quantified the effects of multiple natural and anthropogenic controls on riverine export fluxes and compositions of particulate organic C, dissolved organic C, and dissolved inorganic C for a regional group of eight rivers in the northeastern U.S. Potential controls related to hydrogeomorphology and regional climate, soil order, soil texture, bedrock lithology, land use, and anthropogenic factors were analyzed individually, collectively, and at scales of both local and regional influence. Factors related to hydrogeomorphology and climate, followed in importance by land use and anthropogenic factors, exhibited the strongest impacts on riverine C exports and compositions, particularly at smaller localized scales. C-14 inputs and subsequent biasing of aquatic C studies utilizing natural abundance C-14.
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