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[1]ZHANG Qing-ming,FENG Rui-zhi,ZHANG Bao-hua,et al.Effects of Imidacloprid on Soil Microbes and Enzyme Activities Under the Salinity Stress[J].Research of Soil and Water Conservation,2014,21(03):25-30.

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Effects of Imidacloprid on Soil Microbes and Enzyme Activities Under the Salinity Stress

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 03 Page number: 25-30 Column: Public date: 2014-06-28

Title:: Effects of Imidacloprid on Soil Microbes and Enzyme Activities Under the Salinity Stress

Author(s):: ZHANG Qing-ming¹, FENG Rui-zhi^1,2, ZHANG Bao-hua¹, LIU Xin-gang¹, WANG Zhi¹; 1. College of Chemistry and Pharmaceutical Sciences, Qingdao Agriculture University, Qingdao, Shandong 266109, China;
2. College of Science, Northwest A & F University, Yangling, Shaanxi 712100, China

Keywords:: salinity stress; imidacloprid; soil enzyme; microbial quantity

CLC:: S154

DOI:: -

Abstract:: An indoor simulation experiment was carried out to study the effects of imidacloprid on soil microbes and enzyme activities under the stress of salinity. The results showed that the quantity of bacteria increased by the low concentration (0.4 μg/g) of imidacloprid, and the stimulation-inhibition in bacterial quantity was found at the effect of medium (2.0 μg/g) and high concentration (10.0 μg/g) of imidacloprid. Imidacloprid could stimulate the growth of bacteria in soil when 0.3% of salt was added. Compared to the control, the quantity of actinomycete decreased in soil treated with imidacloprid and has a dose effect relationship. It is same as bacteria, imidacloprid also could stimulate the actinomycete when salt was added in soil. There were no obvious changes of fungal quantity at the effects of imidacloprid and salt in the entire experimental period. The activity of alkaline phosphatase was significantly enhanced in soil treated with imidacloprid and showed a statistically dose-dependent relationship on the 21st day. When salt was added in soil, the activity of alkaline phosphatase was always higher than that of control in the entire experimental period. The activity of urease increased in soil treated with low and medium concentration of imidacloprid. The activity of urease decreased in soil treated with high concentration of imidacloprid on the 21st and 28th days. When salt was added in soil, the inhibition of imidacloprid on urease was reduced and the activity of urease was lower than that of control only on the 14th day. Compared to the control, the activity of β-glucosidase increased in soil treated with medium and high concentration of imidacloprid. This inhibition disappeared under the stress of salinity and a temporal stimulation was found on the 14th day. The above results indicated that imidacloprid (0~10.0 μg/g) could affect the soil microbes and enzyme activities under the salinity stress, but this effect will gradually disappear with the extension of time. And these results also offered the scientific basis for the application of imidacloprid.

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