摘要
开展大气CO_(2)浓度升高对华北夏玉米地温室气体排放的影响可为未来气候变化下农业温室气体减排提供依据。研究基于已稳定运行10年的华北典型一年两季自由大气CO_(2)富集平台进行,于2017年设置2个处理,即常规浓度CO_(2)(aCO_(2),平均400μmol·mol^(-1))和高浓度CO_(2)(eCO_(2),550μmol·mol^(-1)),2018年在不同CO_(2)浓度下增设低氮(LN)和高氮(HN)水平下的不同CO_(2)浓度处理(即aCO_(2)-LN、aCO_(2)-HN、eCO_(2)-LN、eCO_(2)-HN)开展试验,监测和分析不同处理下土壤CO_(2)及N_(2)O排放通量特征,结合土壤硝化潜势和反硝化潜势测定解析N_(2)O排放量变化的可能原因。结果表明,eCO_(2)下夏玉米生育期农田N_(2)O和CO_(2)累积排放量分别比aCO_(2)下显著增加45.5%~65.9%和16.7%~19.2%;N_(2)O排放增加主要发生在施肥、灌溉和降雨后,而土壤CO_(2)在玉米营养生长期排放量较高。eCO_(2)条件下土壤硝化潜势和反硝化潜势分别比aCO_(2)下提高了36.4%和59.0%,对土壤N_(2)O排放有贡献潜力。eCO_(2)下,N_(2)O减排需结合排放机理采取合理的田间管理和水肥调控措施。
In order to provide a support basis for agricultural greenhouse gas mitigation under future climate change,the effect of elevated atmospheric CO_(2) concentration on greenhouse gas emissions from the typical summer maize field in North China was studied.This experiment was carried out in a typical maize field based on the platform of free air carbon dioxide enrichment in North China,which has been in run for 10 years.In 2017,two treatments were set up,including ambient concentration of CO_(2)(aCO_(2),400μmol·mol^(-1))and high concentration of CO_(2)(eCO_(2),550μmol·mol^(-1)).In 2018,four treatments were set up,including two CO_(2) concentrations at two different nitrogen levels(LN at N 90 kg·hm^(-2) and HN at N 180 kg·hm-2,briefed as aCO_(2)-LN,aCO_(2)-HN,eCO_(2)-LN,eCO_(2)-HN).The characteristics of soil N_(2)O and CO_(2) emission fluxes and the potential of nitrification and denitrification under aCO_(2) and eCO_(2) conditions were measured in the study.Results showed that under the condition of eCO_(2),the emissions of N_(2)O and CO_(2) were significantly increased by 45.5%~65.9%and 16.7%~19.2%,respectively,in the summer maize growth period.The increase in N_(2)O emissions mainly occurred after fertilization and irrigation,and the increase in CO_(2) emissions mainly occurred in the vegetative growth of summer maize.Both the processes of soil nitrification and denitrification may contributed to the N_(2)O emissions,with the potential increase by 36.4%and 59.0%under eCO_(2) concentration,respectively.Under eCO_(2),mitigation practices on N_(2)O emission should be adopted according to the N_(2)O production mechanisms in the future.
作者
董李冰
郭李萍
马芬
牛晓光
刁田田
李明
柳瀛
郝兴宇
DONG Li-bing;GUO Li-ping;MA Fen;NIU Xiao-guang;DIAO Tian-tian;LI Ming;LIU Ying;HAO Xing-yu(College of Agronomy,Shanxi Agricultural University,Taigu Shanxi 030801;Key Laboratory for Agro-Environment,Ministry of Agriculture and Rural Affairs,Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081)
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2022年第8期84-93,共10页
Soil and Fertilizer Sciences in China
基金
山西农业大学省部共建有机旱作农业国家重点实验室自主研发项目(202105D121008-3-7)
国家自然科学基金(31971773)
国家重点研发计划项目(2017YFD0300301)
中国农业科学院科技创新工程。
关键词
大气CO_(2)浓度升高
夏玉米
温室气体排放
硝化潜势
反硝化潜势
elevated CO_(2)concentration
summer maize
greenhouse gas emission
nitrification potential
denitrification potential
