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Fungicide impacts on microbial communities in soils with contrasting management histories

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Bending, G. D., Rodriguez-Cruz, M. Sonia and Lincoln, Suzanne D. (2007) Fungicide impacts on microbial communities in soils with contrasting management histories. Chemosphere, Vol.69 (No.1). pp. 82-88. doi:10.1016/j.chemosphere.2007.04.042

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Official URL: http://dx.doi.org/10.1016/j.chemosphere.2007.04.04...

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Abstract

The impacts of the fungicides azoxystrobin, tebuconazole and chlorothalonil on microbial properties were investigated in soils with identical mineralogical composition, but possessing contrasting microbial populations and organic matter contents arising from different management histories. Degradation of all pesticides was fastest in the high OM/biomass soil, with tebuconazole the most persistent compound, and chlorothalonil the most readily degraded. Pesticide sorption distribution coefficient (K-d) did not differ significantly between the soils. Chlorothalonil had the highest K-d (97.3) but K-d for azoxystrobin and tebuconazole were similar (13.9 and 12.4, respectively). None of the fungicides affected microbial biomass in either soil. However, all fungicides significantly reduced dehydrogenase activity to varying extents in the low OM/biomass soil, but not in the high OM/biomass soil. The mineralization of subsequent applications of herbicides, which represents a narrow niche soil process was generally reduced in both soils by azoxystrobin and chlorothalonil. 16S rRNA-PCR denaturing gradient gel electrophoresis (DGGE) indicated that none of the fungicides affected bacterial community structure. 18S rRNA PCR-DGGE analysis revealed that a small number of eukaryote bands were absent in certain fungicide treatments, with each band being specific to a single fungicide-soil combination. Sequencing indicated these represented protozoa and fungi. Impacts on the specific eukaryote DGGE bands showed no relationship to the extent to which pesticides impacted dehydrogenase or catabolism of herbicides. (c) 2007 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)
Journal or Publication Title: Chemosphere
Publisher: Pergamon
ISSN: 0045-6535
Official Date: August 2007
Dates:
DateEvent
August 2007Published
Volume: Vol.69
Number: No.1
Number of Pages: 7
Page Range: pp. 82-88
DOI: 10.1016/j.chemosphere.2007.04.042
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Department of Environment, Food and Rural Affairs
Grant number: PL0550

Data sourced from Thomson Reuters' Web of Knowledge

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