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Increasing soil microbial biomass nitrogen in crop rotation systems by improving nitrogen resources under nitrogen application

引用

Journal of Integrative Agriculture 2022年第5期21卷 1488-1500页

作者： XING Ting-ting CAI An-dong LU Chang-ai YE Hong-ling WU Hong-liang HUAI Sheng-chang WANG Jin-yu XU Ming-gang LIN Qi-mei Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable LandBeijing 100081P.R.China College of Land Science and Technology China Agricultural UniversityBeijing 100094P.R.China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081P.R.China

Soil microbial biomass nitrogen(MBN)contains the largest proportion of biologically active nitrogen(N)in soil,and is considered as a crucial participant in soil N *** management practices such as crop rotation and monocropping systems,dramatically affect MBN in ***,the influence of crop rotation and monocropping in agroecosystems on MBN remains unclear.A meta-analysis based on 203 published studies was conducted to quantify the effect of crop rotation and mono-cropping systems on MBN under synthetic N fertilizer *** analysis showed that crop rotation significantly stimulated the response ratio(RR)of MBN to N fertilization and this parameter reached the highest levels in upland-fallow *** mono-cropping did not change the RR of MBN to N application,however,the RR of MBN to N application in paddy mono-cropping *** difference between crop rotation and mono-cropping systems appeared to be due to the various cropping management scenarios,and the pattern,rate and duration of N *** rotation systems led to a more positive effect on soil total N(TN)and a smaller reduction in soil pH than mono-cropping *** RR of MBN to N application was positively correlated with the RR of mineral N only in crop rotation systems and with the RR of soil pH only in mono-cropping *** the results of Random Forest(RF)model and structural equation model showed that the predominant driving factors of MBN changes in crop rotation systems were soil mineral N and TN,while in mono-cropping systems the main driving factor was soil ***,our study indicates that crop rotation can be an effective way to enhance MBN by improving soil N resources,which promote the resistance of MBN to low pH induced by intensive synthetic N fertilizer application.

关键词： microbial biomass nitrogen crop rotation systems mono-cropping systems synthetic nitrogen fertilizer meta-analysis

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