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Soil organic carbon redistribution by water erosion--the role of CO2 emissions for the carbon budget.

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  • معلومة اضافية
    • المصدر:
      Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: eCollection Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS One Subsets: MEDLINE
    • بيانات النشر:
      Original Publication: San Francisco, CA : Public Library of Science
    • الموضوع:
      Agriculture/*methods ; Carbon/*chemistry ; Carbon Dioxide/*chemistry ; Soil/*chemistry ; Water/*chemistry; Ecosystem ; Water Movements
    • نبذة مختصرة :
      A better process understanding of how water erosion influences the redistribution of soil organic carbon (SOC) is sorely needed to unravel the role of soil erosion for the carbon (C) budget from local to global scales. The main objective of this study was to determine SOC redistribution and the complete C budget of a loess soil affected by water erosion. We measured fluxes of SOC, dissolved organic C (DOC) and CO2 in a pseudo-replicated rainfall-simulation experiment. We characterized different C fractions in soils and redistributed sediments using density fractionation and determined C enrichment ratios (CER) in the transported sediments. Erosion, transport and subsequent deposition resulted in significantly higher CER of the sediments exported ranging between 1.3 and 4.0. In the exported sediments, C contents (mg per g soil) of particulate organic C (POC, C not bound to soil minerals) and mineral-associated organic C (MOC) were both significantly higher than those of non-eroded soils indicating that water erosion resulted in losses of C-enriched material both in forms of POC and MOC. The averaged SOC fluxes as particles (4.7 g C m(-2) yr(-1)) were 18 times larger than DOC fluxes. Cumulative emission of soil CO2 slightly decreased at the erosion zone while increased by 56% and 27% at the transport and depositional zone, respectively, in comparison to non-eroded soil. Overall, CO2 emission is the predominant form of C loss contributing to about 90.5% of total erosion-induced C losses in our 4-month experiment, which were equal to 18 g C m(-2). Nevertheless, only 1.5% of the total redistributed C was mineralized to CO2 indicating a large stabilization after deposition. Our study also underlines the importance of C losses by particles and as DOC for understanding the effects of water erosion on the C balance at the interface of terrestrial and aquatic ecosystems.
    • References:
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      Science. 2004 Jun 11;304(5677):1623-7. (PMID: 15192216)
      Proc Natl Acad Sci U S A. 2011 Dec 6;108(49):19473-81. (PMID: 22106254)
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    • الرقم المعرف:
      0 (Soil)
      059QF0KO0R (Water)
      142M471B3J (Carbon Dioxide)
      7440-44-0 (Carbon)
    • الموضوع:
      Date Created: 20140508 Date Completed: 20150112 Latest Revision: 20211021
    • الموضوع:
      20240829
    • الرقم المعرف:
      PMC4011700
    • الرقم المعرف:
      10.1371/journal.pone.0096299
    • الرقم المعرف:
      24802350