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  Soil water repellency and its implications for organic matter decomposition - is there a link to extreme climatic events?

Goebel, M. O., Bachmann, J., Reichstein, M., Janssens, I. A., & Guggenberger, G. (2011). Soil water repellency and its implications for organic matter decomposition - is there a link to extreme climatic events? Global Change Biology, 17(8), 2640-2656. doi:10.1111/j.1365-2486.2011.02414.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-DBA6-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-4AED-9
Genre: Journal Article

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BGC1517.pdf (Publisher version), 474KB
 
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Goebel, M. O., Author
Bachmann, J., Author
Reichstein, M.1, Author              
Janssens, I. A., Author
Guggenberger, G., Author
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1Research Group Biogeochemical Model-data Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, escidoc:1497760              

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Free keywords: aggregate stability carbon cycle carbon sequestration climate change extreme climatic events hydrophobicity microbial respiration soil organic matter soil water repellency substrate availability land-use types overland-flow generation unsaturated porous-media north-central portugal colorado front range global carbon-cycle aggregate stability sandy soils forest soil microbial biomass
 Abstract: Earth system models associate the ongoing global warming with increasing frequency and intensity of extreme events such as droughts and heat waves. The carbon balance of soils may be more sensitive to the impact of such extremes than to homogeneously distributed changes in soil temperature (T(s)) or soil water content (theta(s)). One parameter influenced by more pronounced drying/rewetting cycles or increases in T(s) is the wettability of soils. Results from laboratory and field studies showed that low theta(s), particularly in combination with high T(s) can increase soil water repellency (SWR). Recent studies have provided evidence that the stability of soil organic matter (SOM) against microbial decomposition is substantially enhanced in water repellent soils. This review hypothesizes that SWR is an important SOM stabilization mechanism that could become more important because of the increase in extreme events. We discuss wettability-induced changes in soil moisture distribution and in soil aggregate turnover as the main mechanisms explaining the reduced mineralization of SOM with increasing SWR. The creation of preferential flow paths and subsequent uneven penetration of rainwater may cause a long-term reduction of soil water availability, affecting both microorganisms and plants. We conclude that climate change-induced SWR may intensify the effects of climatic drought and thus affects ecosystem processes such as SOM decomposition and plant productivity, as well as changes in vegetation and microbial community structure. Future research on biosphere-climate interactions should consider the effects of increasing SWR on soil moisture and subsequently on both microbial activity and plant productivity, which ultimately determine the overall carbon balance.

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Language(s): eng - English
 Dates: 2011
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1111/j.1365-2486.2011.02414.x
ISI: ://WOS:000292308300011
Other: BGC1517
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Title: Global Change Biology
Source Genre: Journal
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Publ. Info: Oxford, UK : Blackwell Science
Pages: - Volume / Issue: 17 (8) Sequence Number: - Start / End Page: 2640 - 2656 Identifier: CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954925618107
ISSN: 1354-1013