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| Effects of Biochar Amendment on Microbial Biomass and Enzyme Activities in Loess Soil |
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| KeyWord:Biochar; loess soil; enzyme activities; BC ; BN ; microbe quantity |
| Author Name | Affiliation | | CHEN Xin-xiang | College of Resources and Environment, Northwest A&F University, Ministry of Agriculture Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Yangling 712100, Shaanxi, China | | GENG Zeng-chao | College of Resources and Environment, Northwest A&F University, Ministry of Agriculture Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Yangling 712100, Shaanxi, China | | WANG Sen | College of Resources and Environment, Northwest A&F University, Ministry of Agriculture Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Yangling 712100, Shaanxi, China | | ZHAO Hong-fei | College of Resources and Environment, Northwest A&F University, Ministry of Agriculture Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Yangling 712100, Shaanxi, China |
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| Abstract: |
| A field trial was carried out to evaluate the effects of biochar applications on the microbial biomass and enzyme activities in loess soil under a winter wheat and summer maize rotation system in temperate region, Shaanxi province, China. Biochar applications at five rates before planting spring maize：B0（0 t·hm-2）, B20（20 t·hm-2）, B40（40 t·hm-2）, B60（60 t·hm-2） and B80（80 t·hm-2）. Biochar applications significantly increased urease and catalase activities at wheat and maize harvests, and also alkali phosphatease activity at maize harvest, as compared with the control. However, biochar did not influence soil invertase and alkali phosphatease activities at wheat harvest. Amendments of biochar improved soil microbial biomass carbon（BC） and nitrogen（BN） but decreased the BC/BN ratios, with the maximum effects found at biochar rate of 80 t·hm-2. Microbial population increased with increasing biochar rates. In addition, Biochar amendments significantly decreased the seasonal fluctuation of BC and BC/BN. Overall, applying biochar can significantly improve soil microbes and enzyme activities. |
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