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000029636 084__ $$2WoS$$aEnvironmental Sciences
000029636 084__ $$2WoS$$aToxicology
000029636 1001_ $$0P:(DE-Juel1)VDB940$$aLiebich, J.$$b0$$uFZJ
000029636 245__ $$aStructural and functional approach to studying pesticide side-effects on specific soil functions
000029636 260__ $$aLawrence, KS$$bSETAC [u.a.]$$c2003
000029636 300__ $$a784 - 790
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000029636 440_0 $$01870$$aEnvironmental Toxicology and Chemistry$$v22$$x0730-7268$$y4
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000029636 520__ $$aThe microbial communities in the soil are responsible for material cycling and thus also for maintaining the fertility of agricultural soils. In order to assess pesticide side effects on the soil processes, detailed knowledge is required about the structure and function of the soil microflora. Therefore, the degradation and humification of C-14-labeled maize straw was studied in process-oriented microcosms, Apart from a native orthic luvisol, a heat-treated soil was used that has been freed from organic carbon by incineration at 600degreesC. Microbial communities involved in the turnover of the crop residues were investigated using denaturing gradient gel electrophoresis (DGGE) of 16S rDNA sequences. Both C-13-nuclear magnetic resonance (NMR) spectroscopy and gel permeation chromatography were used to analyze humic acids produced in the microcosms. To evaluate the sensitivity of the microcosms, the influence of the fungicide dithianon was used in a case study at a concentration of 50 mg/kg. Microbial activity was reduced because of the application of the pesticide, especially in the native soils, while mineralization of C-14-labeled maize straw was only slightly affected. The buildup of fungal biomass was inhibited for at least three weeks. Despite these effects on the microbial communities, no significant differences in the humification products after 26 weeks of incubation were observed.
000029636 536__ $$0G:(DE-Juel1)FUEK257$$2G:(DE-HGF)$$aChemie und Dynamik der Geo-Biosphäre$$cU01$$x0
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000029636 65320 $$2Author$$amicrobial community
000029636 65320 $$2Author$$asoil organic matter
000029636 65320 $$2Author$$ahumification
000029636 65320 $$2Author$$acrop residue
000029636 65320 $$2Author$$afungicide
000029636 7001_ $$0P:(DE-Juel1)VDB21177$$aSchaeffer, A.$$b1$$uFZJ
000029636 7001_ $$0P:(DE-Juel1)VDB202$$aBurauel, P.$$b2$$uFZJ
000029636 773__ $$0PERI:(DE-600)2027441-5$$a10.1897/1551-5028(2003)022<0784:SAFATS>2.0.CO;2$$gVol. 22, p. 784 - 790$$p784 - 790$$q22<784 - 790$$tEnvironmental toxicology and chemistry$$v22$$x0730-7268$$y2003
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