Effect of Different Nitrogen Compounds Addition on CH4 Flux of Leymus secalinus Grassland in Northern Shanxi Province

doi:10.11733/j.issn.1007-0435.2023.07.025

Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (7): 2146-2154.DOI: 10.11733/j.issn.1007-0435.2023.07.025

Effect of Different Nitrogen Compounds Addition on CH₄ Flux of Leymus secalinus Grassland in Northern Shanxi Province

LU Ying-shuai^1,2,3, PENG Jie^1,2,3, LI Yan-jie^1,2,3, YAN Xue-dong^1,2,3, HAO Jie^1,2,3, DIAO Hua-jie^1,2,3, SU Yuan^1,2,3, XU Pei-dong^1,2,3, DONG Kuan-hu^1,2,3, WANG Chang-hui^1,2,3, CHEN Xiao-peng^1,2,3

1. College of Grassland Science, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China;
2. Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation, Taigu, Shanxi Province 030801, China;
3. Youyu Loess Plateau Grassland Ecosystem National Research Station, Youyu, Shanxi Province 03720, China

Received:2022-12-08 Revised:2023-03-06 Online:2023-07-15 Published:2023-08-01

不同氮化合物添加对晋北赖草草地CH₄通量的影响

卢英帅^1,2,3, 彭洁^1,2,3, 李彦颉^1,2,3, 燕学东^1,2,3, 郝杰^1,2,3, 刁华杰^1,2,3, 苏原^1,2,3, 徐沛东^1,2,3, 董宽虎^1,2,3, 王常慧^1,2,3, 陈晓鹏^1,2,3

1. 山西农业大学草业学院, 山西太谷 030801;
2. 草地生态保护与乡土草种质创新山西省重点实验室, 山西太谷 030801;
3. 山西右玉黄土高原草地生态系统国家定位观测研究站, 山西右玉 037200

通讯作者: 陈晓鹏,E-mail:chenxp@sxau.edu.cn
作者简介:卢英帅(1997-),男,汉族,河南滑县人,硕士研究生,主要从事草地生态与管理研究,E-mail:luysmomd@163.com
基金资助:
国家自然科学基金项目(32271682)；山西省科技厅平台专项(202104010910017)；山西农业大学高层次引进人才专项(2021XG008)资助

Abstract

Abstract: CH₄ fluxes can be affected by the form of soil nitrogen. To clarify the effect of different nitrogen compounds input on CH₄ fluxes and its influencing mechanism,we installed six treatments as the control,ammonium nitrate addition,ammonium sulfate addition,ammonium bicarbonate addition,urea addition and slow-release urea addition into a grassland community dominated by Leymus secalinus in northern Shanxi Province. The CH₄ fluxes were measured by static chamber-gas chromatography method and its potential influencing factors were also investigated during the growing season of 2021. The results showed that the Leymus secalinus grassland was a weak CH₄ sink during the growth season,and the average CH₄ uptake rate of control was 5.35 μg·m^-2·h^-1. Different nitrogen compounds additions had no significant effect on CH₄ fluxes,and did not change seasonal fluctuation pattern of CH₄ fluxes. There was no significant difference in CH₄ uptake rate between inorganic and organic nitrogen addition. Soil CH₄ fluxes were mainly determined by soil NO^-₃-N and carbon：nitrogen ratio of microbial biomass. Path analysis showed that the increase of NO^-₃-N content inhibited CH₄ uptake,indicating that it was the availability of soil nitrogen that regulated CH₄ uptake in Leymus Secalinus grassland in northern Shanxi,rather than the chemical composition of nitrogen sources.

Key words: Nitrogen addition, Greenhouse gas, Nitrogen forms, Methane uptake

摘要： 土壤中氮的存在形式是影响CH₄通量的因子之一。为阐明不同氮化合物输入对草地生态系统CH₄通量的影响及其机制，本研究以晋北赖草草地为研究对象，设置对照、硝酸铵、硫酸铵、碳酸氢铵、尿素和缓释尿素添加6个处理，采用静态箱-气相色谱法对2021年生长季草地CH₄通量及其潜在影响因子进行测定，结果表明：晋北赖草草地在生长季是大气CH₄的弱汇，生长季对照处理平均CH₄吸收速率为5.35 μg·m^-2·h^-1；不同氮化合物添加对CH₄吸收速率无显著影响且并未改变CH₄通量的季节波动趋势；无机态与有机态氮添加处理间CH₄吸收速率无显著差异；土壤硝态氮含量和微生物生物量碳氮比是CH₄吸收的主要影响因子；路径分析发现硝态氮含量增加抑制CH₄吸收，表明调控晋北赖草草地CH₄吸收的是土壤氮的有效性而非氮源的化学组成。

关键词: 氮添加, 温室气体, 氮形态, 甲烷吸收

CLC Number:

S812.2

LU Ying-shuai, PENG Jie, LI Yan-jie, YAN Xue-dong, HAO Jie, DIAO Hua-jie, SU Yuan, XU Pei-dong, DONG Kuan-hu, WANG Chang-hui, CHEN Xiao-peng. Effect of Different Nitrogen Compounds Addition on CH₄ Flux of Leymus secalinus Grassland in Northern Shanxi Province[J]. Acta Agrestia Sinica, 2023, 31(7): 2146-2154.

卢英帅, 彭洁, 李彦颉, 燕学东, 郝杰, 刁华杰, 苏原, 徐沛东, 董宽虎, 王常慧, 陈晓鹏. 不同氮化合物添加对晋北赖草草地CH₄通量的影响[J]. 草地学报, 2023, 31(7): 2146-2154.

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Effect of Different Nitrogen Compounds Addition on CH₄ Flux of Leymus secalinus Grassland in Northern Shanxi Province

不同氮化合物添加对晋北赖草草地CH₄通量的影响

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