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

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 

机构地区：[1]Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land,Beijing 100081,P.R.China [2]College of Land Science and Technology,China Agricultural University,Beijing 100094,P.R.China [3]Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081,P.R.China

出　　处：《Journal of Integrative Agriculture》2022年第5期1488-1500,共13页农业科学学报（英文版）

基　　金：Financial supports were received from the Agro-scientific Research in the Public Interest of China(201503122)。

摘　　要：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 cycling.Agronomic management practices such as crop rotation and monocropping systems,dramatically affect MBN in agroecosystems.However,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 application.The 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 rotations.Upland mono-cropping did not change the RR of MBN to N application,however,the RR of MBN to N application in paddy mono-cropping increased.The 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 addition.Crop rotation systems led to a more positive effect on soil total N(TN)and a smaller reduction in soil pH than mono-cropping systems.The 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 systems.Combining 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 pH.Overall,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 

分 类 号：S154.3[农业科学—土壤学]