Total waterborne carbon export and DOC composition from ten nested subarctic peatland catchments—importance of peatland cover, groundwater influence, and inter‐annual variability of precipitation patterns
作者： David Olefeldt , Nigel Roulet , Reiner Giesler , Andreas Persson
DOI: 10.1002/HYP.9358
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摘要: Waterborne carbon (C) export from terrestrial ecosystems is a potentially important flux for the net catchment C balance and links biogeochemical cycling of to their downstream aquatic ecosystems. We have monitored hydrology stream chemistry over 3 years in ten nested catchments (0.6–15.1 km2) with variable peatland cover (0%–22%) groundwater influence subarctic Sweden. Total waterborne export, including dissolved particulate organic (DOC POC) inorganic (DIC), ranged between 2.8 7.3 g m–2 year–1, representing ~10%–30% ecosystem exchange CO2. Several characteristics were affected by interacting effects influence, magnitude timing, partitioning into DOC, POC, DIC chemical composition exported DOC. was greater during wetter years, equivalent an average change ~2 g m–2 year–1 per 100 mm precipitation. Wetter led relative increase than DOC due inferred shift dominance shallow flow pathways sources. Indices (SUVA254 a250/a365) indicated that aromaticity molecular weight increased decreased influence. Our results provide examples on how might be climate change. Copyright © 2012 John Wiley & Sons, Ltd.
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