Effects of three herbicides on soil microbial biomass and activity |
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| Authors: | D. A. Wardle D. Parkinson |
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| Affiliation: | (1) Department of Biological Sciences, University of Calgary, 2500 University Drive N.W., T2N 1N4 Calgary, Alberta, Canada;(2) Kananaskis Centre for Environmental Research, University of Calgary, 2500 University Drive N.W., T2N 1N4 Calgary, Alberta, Canada;(3) Present address: Ruakara Agriculture Centre, Private Bag, Hamilton, New Zealand |
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| Abstract: | Three post-emergence herbicides (2,4-D, picloram and glyphosate) were applied to samples of an Alberta agricultural soil at concentrations of 0, 2, 20, and 200 μg g−1. The effects of these chemicals on certain microbial variables was monitored over 27 days. All herbicides caused enhancement of basal respiration but only for 9 days following application, and only for concentrations of 200 μg g−1. Substrate-induced respiration was temporarily depressed by 200 μg g−1 picloram and 2,4-D, and briefly enhanced by 200 μg g−1 glyphosate. It is concluded that because changes in microbial variables only occurred at herbicide concentrations of much higher than that which occurs following field application, the side-effects of these chemicals is probably of little ecological significance. |
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| Keywords: | bacterial:fungal ratio basal respiration 2,4-D glyphosate microbial biomass picloram post-emergence herbicide selective inhibition substrate-induced respiration |
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