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《Journal of Soil and Water Conservation》 2017-04
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Effects of Maize Straw Returning on Soil Microbial Biomass Carbon and Enzyme Activities Under the Mode of Planting and Returning

LIU Long;LI Zhihong;ZHAO Xiaojun;CUI Tingting;College of Resources and Environment of Jilin Agricultural University;  
In order to compare the effects of different straw returning rates on soil total organic carbon,microbial biomass carbon,cellulase activity and catalase activity at different soil depths,an in-situ experiment was conducted in a separate mode of planting and returning.The experiment was conducted with four levels of returning amount,i.e.0%(R0),0.44%(R1),0.88%(R2)and 1.32%(R3),and three different returning depths,i.e.0—15,15—30,and 30—45cm.The result showed that returning for1 year,soil organic carbon content,microbial biomass carbon content,cellulase activity and catalase activity in 0—15cm soil layer increased with the increasing amount of straw,and those under R3 treatment had the greatest significantce,which increased by 30.98%,101.16%,172.72%,and 5.40%,respectively.In 15—30cm soil layer,the contents of total organic carbon,microbial biomass carbon and catalase activity in soil treated with straw were higher than those in R0,but there were no significant differences between R1,R2,R3,while cellulase activity increased with the amount of straw returning.In 30—45cm soil layer,soil organic carbon content,microbial biomass carbon content and cellulase activity of R2 and R3were significantly higher than those of other treatments,and no significant differences were in catalase activity of all treatment.Compared with returning for 1year,the total organic carbon content,soil microbial biomass carbon and cellulase activity during returning for 2years decreased,with the degree of 8.59%~35.36%,6.74%~29.16%,and 6.18%~31.72%,but catalase activity increased,the largest increase occured in R3(with the increase of soil depth,the increase rate of 14.14%,10.14%,and 12.11%).This study indicates that in the case of separate mode of planting and returning,the high amount of straw can be returned to the field,and also the soil fertility can be improved effectively.
【Fund】: 吉林省科技厅重点基金项目(LFGC14213);; 科技部丰粮工程项目(2012BAD04B02)
【CateGory Index】: S141.4;S154
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