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Effects of dimethomorph on soil respiration and microbial diversity

ZHOU Dongxing;DENG Jie;LI Jing;WU Xinhui;RONG Guohua;SU Ye;SIQIN Bilige;College of Resources and Environmental Science,Northeast Agriculture University;  
【Objective】The study investigated the effects of dimethomorph on soil respiration intensity and microbial diversity to provide guidance and scientific basis for reasonable application of dimethomorph.【Method】Two kg tested soil was collected and dimethomorph at different contents was applied to have initial concentrations of 5,10 and 25 mg/kg,respectively.No application of dimethomorph was used as blank(CK).Soil respiration intensity was measured using CO_2 absorption spectrometry,soil microbial community diversity and carbon source utilization(AWCD)were determined by BIOLOG ECO method.Finally principal component analysis(PCA)was used to analyze the utilization of 31 carbon sources by dimethomorph with different contents.【Result】Compared with CK,dimethomorph had significant inhibitory effect on soil respiration intensity.As the increase of dimethomorph content and number of application,the inhibition of soil respiration intensity increased.The first two application at concentrations of 5 and 10 mg/kg dimethomorph had no significant effects on soil microbial diversity index.After the third application,Shan-non index and McIntosh index significantly reduced while Simpson dominance index had no significant change.Compared with CK,the 25 mg/kg treatment deceased soil species Shannon richness index,Simpson dominance index and McIntosh index overall after 1-3 applications.After the first application,low contents of(5 and 10 mg/kg)dimethomorph had less impact on soil AWCD,while high content(25 mg/kg)dimethomorph had significant effect on soil AWCD and the metabolic activity of soil microorganisms was inhibited.After the second and third applications,soil AWCD decreased greatly in all treatments and inhibition of soil microbial metabolic activity enhanced.Application of dimethomorph affected soil microbial carbon source utilization and soil microbial community structure.【Conclusion】Compared with low dimethomorph levels,high dimethomorph levels had higher inhibitory effect on soil respiration,changed the soil microbial community diversity,and increased the utilization rate of carbohydrates carbon sources.
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