农业环境科学学报2025，Vol.44Issue(4)：890-898,9.DOI:10.11654/jaes.2024-0240
大气CO2浓度和温度升高对黑土禾谷类作物根际土壤有机氮组分的影响
The impact of elevated atmospheric CO2 concentrations and temperatures on the organic nitrogen composition in the rhizosphere soil of cereals in Mollisol
摘要
Abstract
To elucidate the potential impacts of increased atmospheric CO2 concentration and temperature rise on the changes in soil organic nitrogen components of major cereal crops in Mollisol,this study employed open-top chambers(OTCs)to simulate elevated atmospheric CO2 concentration(550 μmol·mol-1)and temperature(+2 ℃).Normal atmospheric CO2 concentration and temperature were used as controls.Soil samples from the rhizosphere of different crops were analyzed for acid hydrolyzable organic nitrogen components,and their correlation with soil physicochemical properties was investigated.The results revealed that the influence of elevated atmospheric CO2 concentration and temperature on acid hydrolyzable total nitrogen and its components in wheat rhizosphere was greater than that in maize and rice.Specifically,in wheat rhizosphere soil,both total nitrogen and its components were affected to varying degrees by elevated atmospheric CO2 concentration and temperature,as well as their interaction.In rice rhizosphere,total nitrogen and unidentified nitrogen was affected by the interaction between the two factors,while in maize rhizosphere,neither total nitrogen nor its components were affected by either the increase in CO2 concentration or temperature alone,or their interaction.Furthermore,compared to the control,under the interactive effect of CO2 concentration and temperature increase,the proportions of different organic nitrogen components to total nitrogen varied among different crops.In the soils of three types of crops,amino acid nitrogen and ammonium nitrogen remain the primary contributors to acid hydrolysable nitrogen components,followed by unknown nitrogen,with amino sugar nitrogen content being the lowest.Correlation analyses showed that acid hydrolysable nitrogen compontents are significantly affected by total nitrogen and available phosphorus.The results of the study indicated that under future conditions of elevated atmospheric CO2 concentration and temperature,the application of N fertiliser for wheat should be moderately reduced,the use of N fertiliser for rice and maize should be increased,and the soil physicochemical properties should be adjusted to improve the soil nitrogen effectiveness.关键词
气候变化/酸解有机氮/氮矿化/禾本科作物Key words
climate change/organic nitrogen fractions/nitrogen mineralization/gramineous crops分类
农业科学引用本文复制引用
毛梦凡,高利正,龙永,徐影,李彦生,金剑,于镇华..大气CO2浓度和温度升高对黑土禾谷类作物根际土壤有机氮组分的影响[J].农业环境科学学报,2025,44(4):890-898,9.基金项目
国家自然科学基金项目(42177435) （42177435）
国际大科学计划培育专项项目(131323KYSB20210004)National Natural Science Foundation of China(42177435) （131323KYSB20210004）
Internation Big Science Cultivation Program(131323KYSB20210004) （131323KYSB20210004）
