农业生态环境-氮素合辑Agro-ecosystem & Environment—Nitrogen
|Increasing soil microbial biomass nitrogen in crop rotation systems by improving nitrogen resources under nitrogen application
|XING Ting-ting1, 2, CAI An-dong3, LU Chang-ai1, YE Hong-ling1, 2, WU Hong-liang1, HUAI Sheng-chang1, WANG Jin-yu1, XU Ming-gang1, LIN Qi-mei3
|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
Abstract 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 mono-cropping systems, dramatically affect MBN in agroecosystems. However, the influence of crop rotation and mono-cropping 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.
Received: 29 December 2020
Accepted: 02 March 2021
|Fund: Financial supports were received from the Agro-scientific Research in the Public Interest of China (201503122).
|About author: XING Ting-ting, E-mail: 15947039328 @163.com; Correspondence LU Chang-ai, E-mail: email@example.com
Cite this article:
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 .
Increasing soil microbial biomass nitrogen in crop rotation systems by improving nitrogen resources under nitrogen application. Journal of Integrative Agriculture, 21(5): 1488-1500.
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