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Long-term fertilization and residue return affect soil stoichiometry characteristics and labile soil organic matter fractions

Long-term fertilization and residue return affect soil stoichiometry characteristics and labile soil organic matter fractions

作     者:Shasha LUO Qiang GAO Shaojie WANG Lei TIAN Qi ZHOU Xiujun LI Chunjie TIAN Shasha LUO;Qiang GAO;Shaojie WANG;Lei TIAN;Qi ZHOU;Xiujun LI;Chunjie TIAN

作者机构:Key Laboratory of Mollisols AgroecologyNortheast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102(China) College of Resources and EnvironmentJilin Agricultural UniversityChangchun 130118(China) 

出 版 物:《Pedosphere》 (土壤圈(英文版))

年 卷 期:2020年第30卷第5期

页      面:703-713页

核心收录:

学科分类:09[农学] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0901[农学-作物学] 

基  金:This research was financially supported by the Special Foundation for State Major Basic Research Program of China(No.2016YFC0501202) the Special Foundation for Basic Research Program in Soil of Chinese Academy Sciences(Nos.XDB 15030103 and XDA23070501) the National Natural Science Foundation of China(Nos.41920104008 and 41701332) the Key Laboratory Foundation of Mollisols Agroecology(No.2016ZKHT-05) the 135 Project of Northeast Institute of Geography and Agroecology of Chinese Academy Sciences(No.Y6H2043001). 

主  题:balanced fertilization carbon management index ecological stoichiometry microbial biomass soil organic C 

摘      要:Ecological stoichiometry provides the possibility for linking microbial dynamics with soil carbon(C),nitrogen(N),and phosphorus(P)metabolisms in response to agricultural nutrient management.To determine the roles of fertilization and residue return with respect to ecological stoichiometry,we collected soil samples from a 30-year field experiment on residue return(maize straw)at rates of 0,2.5,and 5.0 Mg ha^-1 in combination with 8 fertilization treatments:no fertilizer(F0),N fertilizer,P fertilizer,potassium(K)fertilizer,N and P(NP)fertilizers,N and K(NK)fertilizers,P and K(PK)fertilizers,and N,P,and K(NPK)fertilizers.We measured soil organic C(SOC),total N and P,microbial biomass C,N,and P,water-soluble organic C and N,KMnO4-oxidizabIe C(KMnO4-C),and carbon management index(CMI).Compared with the control(F0 treatment without residue return),fertilization and residue return significantly increased the KMn〇4-C content and CMI.Furthermore,compared with the control,residue return significantly increased the SOC content.Moreover,the NPK treatment with residue return at 5.0 Mg ha^-1 significantly enhanced the C:N,C:P,and N:P ratios in the soil,whereas it significantly decreased the C:N and C:P ratios in soil microbial biomass.Therefore,NPK fertilizer application combined with residue return at 5.0 Mg ha^-1 could enhance the SOC content through the stoichiometric plasticity of microorganisms.Residue return and fertilization increased the soil C pools by directly modifying the microbial stoichiometry of the biomass that was C limited.

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