CO_(2)浓度缓增对冬小麦田N_(2)O排放的影响  

Effects of gradually elevated CO_(2)concentration on N_(2)O emission from winter wheat field

作　　者：曹琰梅 柯浩楠 商东耀 武熳秋 帅斯樑 胡正华[1] 李琪[1] CAO Yanmei;KE Haonan;SHANG Dongyao;WU Manqiu;SHUAI Siliang;HU Zhenghua;LI Qi(School of Ecology and Applied Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044,China;Henan Institute of Meteorological Science,Key Laboratory of Agrometeorological Support and Applied Technique,China Meteorological Administration,Zhengzhou 450003,China)

机构地区：[1]南京信息工程大学生态与应用气象学院,江苏南京210044 [2]河南省气象科学研究所,中国气象局农业气象保障与应用技术重点实验室,河南郑州450003

出　　处：《江苏农业学报》2024年第5期855-864,共10页Jiangsu Journal of Agricultural Sciences

基　　金：国家自然科学基金项目(42071023、41775152)。

摘　　要：为研究CO_(2)浓度缓增对冬小麦田N_(2)O排放的影响,利用由开顶式气室(OTC)组成的CO_(2)浓度自动调控平台,扬麦22号为供试材料开展田间试验。将大气CO_(2)浓度作为对照(CK),设置CO_(2)浓度缓增处理C_(80)(CO_(2)浓度缓慢增加80μmol/mol)和C_(120)(CO_(2)浓度缓慢增加120μmol/mol)。结果表明,CO_(2)浓度缓增处理没有改变小麦田N_(2)O排放通量的季节性变化特征。在2017-2018年冬小麦生长季,CK、C_(80)处理土壤N_(2)O累积排放量分别为(25.49±3.33) mg/m^(2)、(26.83±3.21) mg/m^(2);2018-2019年冬小麦生长季,CK、C_(120)处理土壤N_(2)O累积排放量分别为(113.06±2.66) mg/m^(2)、(121.20±9.28) mg/m^(2)。在2017-2018年冬小麦生长季,CK、C_(80)处理土壤-冬小麦系统N_(2)O累积排放量分别为(25.99±1.39) mg/m^(2)、(29.83±4.20) mg/m^(2)。各生育期土壤N_(2)O累积排放量与冬小麦地上部分生物量呈极显著正相关(P<0.01),土壤-冬小麦系统N_(2)O累积排放量与冬小麦地上部分生物量呈极显著正相关(P<0.01)。In order to study the effects of gradually elevated CO_(2)concentration on N_(2)O emission from winter wheat field,a field experiment was carried out with Yangmai 22 as the test material by using an open-top chamber(OTC).Using atmospheric CO_(2)concentration as the control(CK),and two gradually elevated CO_(2)concentration treatments,C_(80)(CO_(2)concentration increased by 80μmol/mol)and C_(120)(CO_(2)concentration increased by 120μmol/mol),were set.The results showed that the seasonal variation of N_(2)O emission flux in wheat field was not changed by the slow increase of CO_(2)concentration.During 2017-2018 winter wheat growing season,the cumulative N_(2)O emissions from soil in CK and C_(80)treatment were(25.49±3.33)mg/m 2 and(26.83±3.21)mg/m 2,respectively.During 2018-2019 winter wheat growing season,the accumulative N_(2)O emissions in CK and C_(120)treatment were(113.06±2.66)mg/m 2 and(121.20±9.28)mg/m 2,respectively.During 2017-2018 winter wheat growing season,the cumulative N_(2)O emissions from the soil-winter wheat system in CK and C_(80)treatment were(25.99±1.39)mg/m 2 and(29.83±4.20)mg/m 2,respectively.The cumulative N_(2)O emission from soil was positively correlated with the aboveground biomass of winter wheat(P<0.01),and the cumulative N_(2)O emission from soil-winter wheat system was positively correlated with the aboveground biomass of winter wheat(P<0.01).

关 键 词：冬小麦 N_(2)O排放量 开顶式气室 CO_(2)浓度缓增 

分 类 号：S512.11[农业科学—作物学]