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000055830 084__ $$2WoS$$aSoil Science
000055830 1001_ $$0P:(DE-Juel1)VDB940$$aLiebich, J.$$b0$$uFZJ
000055830 245__ $$aDegradation and humification of maize straw in soil microcosms inoculated with simple and complex microbial communities
000055830 260__ $$aOxford [u.a.]$$bWiley-Blackwell$$c2007
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000055830 520__ $$aMicrobial communities are responsible for soil organic matter cycling and thus for maintaining soil fertility. A typical Orthic Luvisol was freed from organic carbon by thermal destruction at 600°C. Then the degradation and humification of 14C-labelled maize straw by defined microbial communities was analysed. To study the role of microbial diversity on the humification of plant material, microcosms containing sterilized soil were inoculated with a natural microbial community or with microbial consortia consisting of bacterial and fungal soil isolates. Within 6 weeks, 41 ± 4% of applied 14C-labelled maize straw was mineralized in the soil microcosms containing complex communities derived from a soil suspension, whilst the most efficient communities composed of soil isolates mineralized less than 35%. The humification products were analysed by solution state 13C-NMR-spectroscopy and gel permeation chromatography (GPC). The analyses of humic acids extracts by solution state 13C-NMR-spectroscopy revealed no difference in the development of typical chemical functional groups for humic substances during incubation. However, the increase in specific molecular size fractions of the extracted humic acids occurred only after inoculation with complex communities, but not with defined isolates. While it seems to be true that redundancy in soil microbial communities contributes to the resilience of soils, specific soil functions may no longer be performed if a microbial community is harshly affected in its diversity or growth conditions.
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000055830 7001_ $$0P:(DE-HGF)0$$aSchloter, M.$$b1
000055830 7001_ $$0P:(DE-HGF)0$$aSchäffer, A.$$b2
000055830 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b3$$uFZJ
000055830 7001_ $$0P:(DE-Juel1)VDB202$$aBurauel, P.$$b4$$uFZJ
000055830 773__ $$0PERI:(DE-600)2020243-X$$a10.1111/j.1365-2389.2006.00816.x$$gVol. 58, p. 141 - 151$$p141 - 151$$q58<141 - 151$$tEuropean journal of soil science$$v58$$x1351-0754$$y2007
000055830 8567_ $$uhttp://dx.doi.org/10.1111/j.1365-2389.2006.00816.x
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