Response of soil respiration to nitrogen fertilization: Evidence from a 6-year field study of croplands

doi:10.1016/j.geoderma.2020.114829

	Response of soil respiration to nitrogen fertilization: Evidence from a 6-year field study of croplands
	Yan, Weiming 1,2; Zhong, Yangquanwei 3; Liu, Jin 1; Shangguan, Zhouping 1
刊名	GEODERMA
	2021-02-15
卷号	384 页码:9
关键词	Nitrogen fertilization Soil respiration Respiration components Q(10) C emission Farmland ecosystem
ISSN号	0016-7061
DOI	10.1016/j.geoderma.2020.114829
通讯作者	Shangguan, Zhouping(shangguan@ms.iswc.ac.cn)
英文摘要	Agroecosystems receive large amounts of nitrogen (N), which can have a profound impact on soil respiration (Rs). Although Rs is the largest carbon dioxide (CO2) flux from terrestrial ecosystems to the atmosphere, the potential effects of N fertilization on Rs and its components (heterotrophic respiration (Rh) and autotrophic respiration (Ra)) remain controversial, and information on the impacts of N fertilization on C emission from long-term experiments is lacking. In this study, we conducted a field experiment during 6 growing seasons (2012-2018) in which we applied N fertilizer at three rates (0, 180 and 360 kg N ha(-1), referred to as NO, N180 and N360, respectively) to two wheat varieties (Changhan No. 58 (CH) and Zhengmai No. 9023 (ZM)) and investigated the effects of N fertilization on Rs and its components by continuous half-hourly observations. We found that over the 6 growing seasons, N180 and N360 increased the mean growing season soil C emission by 29.7% and 11.6%, respectively, due to the increased C emission through Ra under fertilization, which was related to an increased leaf area index (LAI) and canopy photosynthesis (Pn). Significant seasonal variations in the Rs rate were observed; both Rh and Ra contributed to these variations, and the variations were significantly correlated with both soil and air temperature and plant-related traits (LAI and canopy Pn). In addition, the C emission through Rs during the growing season increased throughout the experiment, mainly because of an increase in C emissions through Rh that was caused by increasing temperature during the observation period due to climate change at the experimental site. However, C emission through Rs increased relatively rapidly under the N180 treatment due to the increased Rh throughout the experiment. Furthermore, interaction effects of soil moisture and temperature on the Rs rate and its components were also observed. Overall, our findings highlight the significance of N fertilization in term of soil C emission and its feedback under global warming in agroecosystems.
资助项目	Science and Technology Innovation Program of Shaanxi Academy of Forestry[SXLK2020-0101] ; National Natural Science Foundation of China[41701336] ; National Natural Science Foundation of China[41807323] ; National Natural Science Foundation of China[42077452] ; Natural Science Basic Research Plan in Shaanxi Province of China[2020JM-096] ; Fundamental Research Funds for the Central Universities[2452020184] ; Association of Science and Technology Youth Talents Support Project in Shaanxi Province[201902-04]
WOS关键词	HETEROTROPHIC RESPIRATION ; CARBON-DIOXIDE ; TEMPERATURE SENSITIVITY ; INTERANNUAL VARIABILITY ; AUTOTROPHIC RESPIRATION ; SEMIARID GRASSLAND ; CO2 EFFLUX ; N ADDITION ; COMPONENTS ; ECOSYSTEM
WOS研究方向	Agriculture
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000594244300023
资助机构	Science and Technology Innovation Program of Shaanxi Academy of Forestry ; National Natural Science Foundation of China ; Natural Science Basic Research Plan in Shaanxi Province of China ; Fundamental Research Funds for the Central Universities ; Association of Science and Technology Youth Talents Support Project in Shaanxi Province
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/136541]
专题	中国科学院地理科学与资源研究所
通讯作者	Shangguan, Zhouping
作者单位	1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling, Shaanxi, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling, Shaanxi, Peoples R China 3.Northwestern Polytech Univ, Sch Ecol & Environm, Xian, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Yan, Weiming,Zhong, Yangquanwei,Liu, Jin,et al. Response of soil respiration to nitrogen fertilization: Evidence from a 6-year field study of croplands[J]. GEODERMA,2021,384:9.
APA	Yan, Weiming,Zhong, Yangquanwei,Liu, Jin,&Shangguan, Zhouping.(2021).Response of soil respiration to nitrogen fertilization: Evidence from a 6-year field study of croplands.GEODERMA,384,9.
MLA	Yan, Weiming,et al."Response of soil respiration to nitrogen fertilization: Evidence from a 6-year field study of croplands".GEODERMA 384(2021):9.