Long-term manure application increased soil organic carbon and nitrogen mineralization through accumulation of unprotected and physically protected carbon fractions  

作　　者：Muhammad Nadeem ASHRAF Cheng HU Xiangru XU Tariq AZIZ Lei WU Muhammad Ahmed WAQAS Muhammad FAROOQ Xu HU Wenju ZHANG Minggang XU 

机构地区：[1]Key Laboratory of Cultivated Land Quality Monitoring and Evaluation,Ministry of Agriculture and Rural Affairs,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081(China) [2]Institute of Soil and Environmental Sciences,University of Agriculture,Faisalabad 38040(Pakistan) [3]Institute of Plant Protection and Soil Science,Hubei Academy of Agricultural Sciences,Wuhan 430064(China) [4]Institute of Soil and Environmental Sciences,University of Agriculture,Faisalabad,Sub-Campus Depalpur,Okara 56130(Pakistan) [5]Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081(China) [6]Department of Plant Sciences,College of Agricultural and Marine Sciences,Sultan Qaboos University,Al-Khoud 123(Oman) [7]Shanxi Province Key Laboratory of Soil Environment and Nutrient Resources,Engineer and Technology Academy of Ecology and Environment,Shanxi Agricultural University,Taiyuan 030031(China)

出　　处：《Pedosphere》2023年第2期343-354,共12页土壤圈（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41877105,4190709398,and 41620104006)。

摘　　要：Soil organic carbon(SOC)and nitrogen(N)mineralization are important biogeochemical processes associated with soil fertility.These processes are influenced by physically,chemically,and biologically stabilized SOC fractions,the mechanisms of which are not well known.The present study was conducted to evaluate the combined effect of manure and mineral fertilizers on the contents of SOC fractions to promote the mineralization of SOC and N.Treatments included:i)no fertilizer control(CK);ii)a combination of mineral N,phosphorus,and potassium fertilizers(NPK);iii)manure alone(M);iv)manure combined with NPK(MNPK);and v)a high dose of manure combined with NPK(hMNPK).The combined uses of manure and mineral fertilizers(MNPK and hMNPK)enhanced the accumulation of the unprotected coarse particulate organic carbon(C)fraction(cPOC)by 44%-72%compared to CK.Manure applications(M,MNPK and hMNPK)enhanced physically microaggregate-protected organic C(μagg),physicochemically protected organic C within the microaggregate-derived silt(μsilt)fraction(H-μsilt),and physicobiochemically protected organic C within theμsilt fraction(NH-μsilt)by 30%-56%,62%-150%,and 27%-51%,respectively.In contrast,all chemically and biochemically protected SOC fractions showed a minor response to manure application.Accumulation of cPOC,μagg,H-μsilt,and physicochemically protected organic C within the microaggregate-derived clay fraction(H-μclay)significantly contributed to the mineralization of SOC and N,resulting in a significant increase in rice grain yield with long-term manure application.In summary,long-term combined use of manure and mineral fertilizers improved SOC accumulation in unprotected and physically protected fractions,which enhanced SOC and N mineralization and benefited soil productivity in a rice-wheat cropping system.

关 键 词：fertilization strategy grain yield organic C fraction organic matter stabilization protection mechanism 

分 类 号：S141[农业科学—肥料学]