Clay-to-carbon ratio controls the effect of herbicide application on soil bacterial richness and diversity in a loamy field

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Soil texture and soil organic carbon (OC) influence
the bacterial microenvironment and also control
herbicide sorption. A field-scale exploratory study was
conducted to investigate the potential interaction between
soil texture parameters, herbicides, and soil bacterial
richness and diversity. Glyphosate and bentazon were
used to evaluate the herbicidal effect on bacterial community
under different conditions created by clay and OC
gradients in a loamy field. Metabarcoding by highthroughput
sequencing of bacterial rDNA was used to
estimate bacterial richness and diversity using OTUs,
abundance-based coverage (ACE), Shannon diversity
index, and phylogenetic diversity. In general, bacterial
richness and diversity increased after bentazon application
and decreased after glyphosate application. There
was no significant effect for field locations with Dexter
n (the ratio between clay and OC) values below 4.04 (the
median of the values in the field study). The correlation
coefficient (r) between bacterial richness and clay decreased
after bentazon application, but increased after
glyphosate application. Correlations between Dexter n
and bacterial indices followed the same pattern, decreasing
after bentazon application and increasing after glyphosate
application. This indicated that the specific chemical
nature of individual herbicides affected bacterial communities.
This study reinforced the importance of including
soil physical and chemical characteristics to explain
the influence of pesticides on the variation in soil bacterial
communities in agroecosystems.
Original languageEnglish
Article number3
JournalWater, Air and Soil Pollution
Number of pages12
Publication statusPublished - 2017

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