High nitrogen fertilizer input enhanced the microbial network complexity in the paddy soil

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外文摘要：·N fertilizer altered bacterial community compositions by changing soil nutrients.·Bacterial ammonia oxidation became predominated with the increasing N rate.·Excessive N input caused the information of a more complex microbial network.·Intensified microbial competition by excessive N was due to negative link increase.Nitrogen(N)fertilization drives the structure and function of soil microbial communities,which are crucial for regulating soil biogeochemical cycling and maintaining ecosystem stability.Despite the N fertilizer effects on soil microbial composition and diversity have been widely investigated,it is generally overlooked that ecosystem processes are carried out via complex associations among microbiome members.Here,we examined the effects of five N fertilization levels(0,135,180,225,and 360 kg N ha-1)on microbial co-occurrence networks and key functional taxa such as ammonia-oxidizers in paddy soils.The results showed that N addition altered microbial community composition,which were positively related to soil total N and available phosphorus(P)contents.The abundance of ammonia-oxidizing archaea(AOA)significantly decreased after N addition,whereas ammonia-oxidizing bacteria(AOB)increased in N360 treatment.Compared with low-N group(N0 and N135),the high-N group(N225 and N360)shaped more complex microbial webs and thus improved the stability of the microbial community.Partial least squares path modeling further revealed that N fertilizer had a higher effect on microbial network complexity in the high-N group(0.83)than the low-N group(0.49).Although there were more positive links across all microbial networks,the proportion of negative links significantly increased in the high-N network,suggesting that excess N addition aggravated the competition among microbial species.Disentangling these interactions between microbial communities and N fertilization advances our understanding of biogeochemical processes in paddy soils and their effects on nutrient supply to rice production.Our findings highlighted that highly N-enriched paddy soils have more stable microbial networks and can better sustain soil ecological functions to cope with the ongoing environmental changes.

外文关键词：

nitrogen fertilizerpaddy soilco-occurrence networkmicrobial interaction

作者：

Yanan Chen、Yan Li、Tianyi Qiu、Haoran He、Ji Liu、Chengjiao Duan、Yongxing Cui、Min Huang、Chunyan Wu、Linchuan Fang

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作者单位：

The Research Center of Soil and Water Conservation and Ecological Environment,Chinese Academy of Sciences and Ministry of Education,Yangling 712100,China

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation CAS and MWR,Yangling 712100,China

University of Chinese Academy of Sciences,Beijing 100049,China

Institute of Environment Resource and Soil Fertilizer,Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,China

College of Natural Resources and Environment,Northwest A&F University,Yangling 712100,China

Hubei Province Key Laboratory for Geographical Process Analysis and Simulation,Central China Normal University,Wuhan 430079,China

Department of Ecohydrology,Leibniz Institute of Freshwater Ecology and Inland Fisheries,Berlin 12587,Germany

Sino-French Institute for Earth System Science,College of Urban and Environmental Sciences,Peking University,Beijing 100871,China

College of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China

CAS Center for Excellence in Quaternary Science and Global Change,Xi'an 710061,China

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基金：

Joint Funds of the National Natural Science of China

项目编号：

U21A20237

出版年：

2024

DOI：

10.1007/s42832-023-0205-3

土壤生态学快报(英文)

ISSN：

年,卷(期)：2024.6(2)