HagedornHeesHandaEtAl2008

Reference

Hagedorn, F., van Hees, P.A.W., Handa, I.T., Hattenschwiler, S. (2008) Elevated atmospheric CO2 fuels leaching of old dissolved organic matter at the alpine treeline. Global Biogeochemical Cycles, 22(2). (Scopus )

Abstract

Dissolved organic matter (DOM), the mobile form of soil organic matter (SOM), plays an important role in soil C cycling and in nutrient transport. We investigated the effects of 5 years Of CO2 enrichment (370 versus 570 μmol CO2 Mol-1) on DOM dynamics at the alpine treeline, including the analysis of fast-cycling components such as low molecular weight organic acids (LMWOAs), dissolved organic carbon (DOC) biodegradability, and the decomposition of 14C-labeled oxalate. Concentrations of DOC in canopy throughfall were 20% higher at elevated CO2, probably driven by higher carbohydrate concentrations in leaves. In the organic soil layer, 5 years of CO2 enrichment increased water-extractable organic C by 17% and soil solution DOC at 5 cm depth by 20%. The 13C tracing of recently assimilated CO2 revealed that the input of recent plant-derived C (<15% of total DOC) was smaller than the CO2-induced increase in DOC. This strongly suggests that CO2 enrichment enhanced the mobilization of native DOC, which is supported by significant increases in dissolved organic nitrogen (DON). We mainly attribute these increases to a stimulated microbial activity as indicated by higher basal and soil respiration rates (+27%). The 14C-labeled oxalate was more rapidly mineralized from high CO2 soils. The concentrations of LMWOAs, but also those of "hydrophilic" DOC and biodegradable DOC (6% of total DOC), were, however, not affected by elevated CO2, suggesting that production and consumption of "labile" DOC were in balance. In summary, our data suggest that 5 years Of CO2 enrichment speeded up the cycling of "labile" DOM and SOM in a late successional treeline ecosystem and increased the mobilization of older DOM through a stimulated microbial activity. Such a "priming effect" implies that elevated CO2 can accelerate the turnover of native SOM, and thus it may induce increasing losses of old C from thick organic layers. Copyright 2008 by the American Geophysical Union.

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@ARTICLE { HagedornHeesHandaEtAl2008,
    AUTHOR = { Hagedorn, F. and van Hees, P.A.W. and Handa, I.T. and Hattenschwiler, S. },
    TITLE = { Elevated atmospheric CO2 fuels leaching of old dissolved organic matter at the alpine treeline },
    JOURNAL = { Global Biogeochemical Cycles },
    YEAR = { 2008 },
    VOLUME = { 22 },
    NUMBER = { 2 },
    NOTE = { cited By (since 1996) 14 },
    ABSTRACT = { Dissolved organic matter (DOM), the mobile form of soil organic matter (SOM), plays an important role in soil C cycling and in nutrient transport. We investigated the effects of 5 years Of CO2 enrichment (370 versus 570 μmol CO2 Mol-1) on DOM dynamics at the alpine treeline, including the analysis of fast-cycling components such as low molecular weight organic acids (LMWOAs), dissolved organic carbon (DOC) biodegradability, and the decomposition of 14C-labeled oxalate. Concentrations of DOC in canopy throughfall were 20% higher at elevated CO2, probably driven by higher carbohydrate concentrations in leaves. In the organic soil layer, 5 years of CO2 enrichment increased water-extractable organic C by 17% and soil solution DOC at 5 cm depth by 20%. The 13C tracing of recently assimilated CO2 revealed that the input of recent plant-derived C (<15% of total DOC) was smaller than the CO2-induced increase in DOC. This strongly suggests that CO2 enrichment enhanced the mobilization of native DOC, which is supported by significant increases in dissolved organic nitrogen (DON). We mainly attribute these increases to a stimulated microbial activity as indicated by higher basal and soil respiration rates (+27%). The 14C-labeled oxalate was more rapidly mineralized from high CO2 soils. The concentrations of LMWOAs, but also those of "hydrophilic" DOC and biodegradable DOC (6% of total DOC), were, however, not affected by elevated CO2, suggesting that production and consumption of "labile" DOC were in balance. In summary, our data suggest that 5 years Of CO2 enrichment speeded up the cycling of "labile" DOM and SOM in a late successional treeline ecosystem and increased the mobilization of older DOM through a stimulated microbial activity. Such a "priming effect" implies that elevated CO2 can accelerate the turnover of native SOM, and thus it may induce increasing losses of old C from thick organic layers. Copyright 2008 by the American Geophysical Union. },
    ART_NUMBER = { GB2004 },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1029/2007GB003026 },
    ISSN = { 08866236 },
    KEYWORDS = { Atmospheric composition; Biological materials; Carbon dioxide; Organic acids; Organic carbon, biodegradation; carbon cycle; carbon dioxide enrichment; decomposition; dissolved organic carbon; dissolved organic nitrogen; geomicrobiology; leaching; microbial activity; nutrient cycling; soil organic matter; treeline },
    OWNER = { Luc },
    SOURCE = { Scopus },
    TIMESTAMP = { 2012.05.14 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-50849089599&partnerID=40&md5=92215ce8973a9b47d262ae8fed01c054 },
}

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