Effects of organic fertilizers on organic carbon accumulation in alkalized saline soil and silage maize yield  

作　　者：Lidong Ji Lei Li Rui Wang Xing Xu Fengju Zhang Guilian Mao Teng Wang 

机构地区：[1]School of Forestry and Prataculture,Ningxia University,Yinchuan,750021,China [2]School of Agriculture,Ningxia University,Yinchuan,750021,China [3]School of Ecological Environment,Ningxia University,Yinchuan 750021,China [4]School of Life Sciences,Ningxia University,Yinchuan 750021,China

出　　处：《International Journal of Agricultural and Biological Engineering》2024年第2期159-168,共10页国际农业与生物工程学报（英文）

基　　金：supported by the project of the National Key Research and Development Program of China(Grant No.2021YFD1900605);The Joint Open Research Fund Program of State key Laboratory of Hydroscience and Engineering and Tsinghua-Ningxia Yinchuan Joint Institute of Internet of Waters on Digital Water Governance(Grant No.sklhse-2022-Iow05);The data supporting the findings of this study are available from the corresponding author upon reasonable request.

摘　　要：To understand the combined effect of organic and chemical fertilizers on soil carbon emissions and carbon balance of a farmland ecosystem,this study investigated the organic fertilizer nitrogen replacing different proportions of chemical fertilizer nitrogen.The results showed that,compared to F_(100),the O_(15)F_(85) treatment increased the yield and net ecosystem productivity carbon sequestration of silage maize under mild,moderate,and severe salinization levels,as well as the contents of soil organic carbon,microbial carbon,and humin carbon,while reducing plant carbon emissions.The O_(15)F_(85) treatment did not significantly increase soil carbon emissions(CEC),but O_(30)F_(70),O_(45)F_(55) and O_(100) treatments significantly increased CEC.The soil carbon balance analysis showed that the farmland ecosystem was a“sink”for atmospheric CO_(2) under each treatment.The O_(15)F_(85) treatment produced an“excitation effect”to enhance the carbon sink effect of silage maize farmland under mild,moderate and severe salinization levels while maintaining stable production and emissions.Although the O_(100) treatment increased the carbon sink of farmland under different salinization levels,the yield was significantly reduced and did not represent practical production levels.Correlation analysis showed that soil organic carbon components and ecosystem carbon balance were closely related to soil total salt,pH and bulk density,while soil dissolved organic carbon,humus carbon components and carbon emissions were closely related to soil moisture and temperature.Therefore,the purpose of improving the carbon sink of saline-alkali land can be achieved through soil salt inhibition,soil structure remodeling and water supplement and warming regulation,which provides technical and theoretical support for reducing carbon emissions,achieving carbon neutrality and alleviating global warming.

关 键 词：carbon balance carbon component organic carbon organic substitution saline-alkali land 

分 类 号：S15[农业科学—土壤学] S513[农业科学—农业基础科学]