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1000 Titel
  • Si cycling in a forest biogeosystem – the importance of transient state biogenic Si pools
1000 Autor/in
  1. Sommer, M. |
  2. Höhn, A. |
  3. Breuer, J. |
  4. Zagorski, Z. |
  5. Busse, J. |
  6. Barkusky, D. |
  7. Meier, K. |
  8. Puppe, D. |
  9. Wanner, M. |
  10. Kaczorek, D. |
  11. Jochheim, Hubert |
1000 Erscheinungsjahr 2013
1000 Art der Datei
1000 Publikationstyp
  1. Artikel |
1000 Online veröffentlicht
  • 2013-7-24
1000 Erschienen in
1000 Quellenangabe
  • 10(7): 4991-5007
1000 FRL-Sammlung
1000 Copyrightjahr
  • 2013
1000 Lizenz
1000 Verlagsversion
  • http://doi.org/10.5194/bg-10-4991-2013 |
1000 Ergänzendes Material
  • http://www.biogeosciences.net/10/4991/2013/bg-10-4991-2013-supplement.pdf |
1000 Publikationsstatus
1000 Begutachtungsstatus
1000 Sprache der Publikation
1000 Abstract/Summary
  • The relevance of biological Si cycling for dissolved silica (DSi) export from terrestrial biogeosystems is still in debate. Even in systems showing a high content of weatherable minerals, like Cambisols on volcanic tuff, biogenic Si (BSi) might contribute > 50% to DSi (Gerard et al., 2008). However, the number of biogeosystem studies is rather limited for generalized conclusions. To cover one end of controlling factors on DSi, i.e., weatherable minerals content, we studied a forested site with absolute quartz dominance (> 95%). Here we hypothesise minimal effects of chemical weathering of silicates on DSi. During a four year observation period (05/2007–04/2011), we quantified (i) internal and external Si fluxes of a temperate-humid biogeosystem (beech, 120 yr) by BIOME-BGC (version ZALF), (ii) related Si budgets, and (iii) Si pools in soil and beech, chemically as well as by SEM-EDX. For the first time two compartments of biogenic Si in soils were analysed, i.e., phytogenic and zoogenic Si pool (testate amoebae). We quantified an average Si plant uptake of 35 kg Si ha−1 yr−1 – most of which is recycled to the soil by litterfall – and calculated an annual biosilicification from idiosomic testate amoebae of 17 kg Si ha−1. The comparatively high DSi concentrations (6 mg L−1) and DSi exports (12 kg Si ha−1 yr−1) could not be explained by chemical weathering of feldspars or quartz dissolution. Instead, dissolution of a relictic, phytogenic Si pool seems to be the main process for the DSi observed. We identified canopy closure accompanied by a disappearance of grasses as well as the selective extraction of pine trees 30 yr ago as the most probable control for the phenomena observed. From our results we concluded the biogeosystem to be in a transient state in terms of Si cycling.
1000 Fachgruppe
  1. Agrarwissenschaften |
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  1. https://frl.publisso.de/adhoc/creator/U29tbWVyLCBNLg==|https://frl.publisso.de/adhoc/creator/SMO2aG4sIEEu|https://frl.publisso.de/adhoc/creator/QnJldWVyLCBKLg==|https://frl.publisso.de/adhoc/creator/WmFnb3Jza2ksIFou|https://frl.publisso.de/adhoc/creator/QnVzc2UsIEou|https://frl.publisso.de/adhoc/creator/QmFya3Vza3ksIEQuIA==|https://frl.publisso.de/adhoc/creator/TWVpZXIsIEsu|https://frl.publisso.de/adhoc/creator/UHVwcGUsIEQu|https://frl.publisso.de/adhoc/creator/V2FubmVyLCBNLg==|https://frl.publisso.de/adhoc/creator/S2Fjem9yZWssIEQu|http://orcid.org/0000-0001-8047-4553
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