Effects of nitrogen addition on carbonate-derived CO_(2) emission after biochar addition
作者机构：Key Laboratory of Biochemistry and Molecular Biology in University of ShandongCollege of Seed and Facility Agricultural EngineeringWeifang UniversityWeifang 261061China Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Institute of EcologyCollege of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China
出 版 物：《Soil Ecology Letters》 (土壤生态学快报（英文）)
年 卷 期：2023年第5卷第4期
页 面：39-49页
核心收录：
学科分类：09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学] 090301[农学-土壤学]
基 金：supported by the National Natural Science Foundation of China(32072518 and 42141006) the Natural Science Foundation of Shandong Province(ZR2020QD042)
主 题：biochar soil organic carbon soil inorganic carbon three-source partitioning soil CO_(2)emission 13C isotope
摘 要：●We studied the effect of nitrogen and biochar on CO_(2) emission from SOC and SIC.●Nitrogen increased SIC-derived CO_(2) by 41%but decreased SOC-derived CO_(2) by 20%.●Biochar reduced total soil-derived CO_(2) by neutralizing nitrogen-induced acidity.●We proposed a method for 3-or 4-source partitioning CO_(2) emission from calcareous *** addition generally increases the alkalinity regeneration to resist soil acidification driven by nitrogen(N)*** soils contain soil organic carbon(SOC)and inorganic C(SIC).Owing to technical limitations in three-source partitioning CO_(2),how biochar addition affects SOC-and SIC-derived CO_(2) emission has not been clarified ***,we conducted a 70-day incubation experiment of ammonium-N and maize-straw-derived biochar additions to investigate the N plus biochar impacts on SOC-and SIC-derived CO_(2) *** the 70-day incubation,we found that the N-only addition increased the SIC-derived CO_(2) emission by approximately 41%compared with the control,but decreased the SOC-derived CO_(2) emission by approximately 20%.This suggests that the distinct responses of SIC-and SOC-derived CO_(2) emission to N-only addition come from N-induced acidification and preferential substrate(N)utilization of soil microorganisms,*** with N-only addition,N plus biochar addition decreased the SIC-derived CO_(2) emission by 17%−20%during the first 20 days of incubation,but increased it by 54%during the next 50 *** result suggested that biochar addition reduced the SIC-derived CO_(2) emission likely due to the alkalization capacity of biochar exceeding the acidification capacity of ammonium-N in the short term,but it may increase the SIC-derived CO_(2) emission induced by the weak acidity produced from biochar mineralization in the long *** study is helpful to improve the quantification of CO_(2) emission from calcareous soils.
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