Deepened snow loosens temporal coupling between plant and microbial N utilization and induces ecosystem N losses

doi:10.1111/gcb.16234

CORC > 植物研究所 > 中国科学院植物研究所 > 植被与环境变化国家重点实验室

	Deepened snow loosens temporal coupling between plant and microbial N utilization and induces ecosystem N losses
	Jia, Zhou 3; Li, Ping 3; Wu, Yuntao 3; Chang, Pengfei 3; Deng, Meifeng ; Liang, Luyin 3; Yang, Sen 3; Wang, Chengzhang 3; Wang, Bin 3; Yang, Lu 3
刊名	GLOBAL CHANGE BIOLOGY
	2022
卷号	28 期号:15 页码:4655-4667
关键词	N-15 labeling deepened snow ecosystem nitrogen retention freeze-thaw growing season N2O emission plant-microbial nitrogen competition temporal coupling
ISSN号	1354-1013
DOI	10.1111/gcb.16234
文献子类	Article
英文摘要	Seasonal differences in plant and microbial nitrogen (N) acquisition are believed to be a major mechanism that maximizes ecosystem N retention. There is also a concern that climate change may interrupt the delicate balance in N allocation between plants and microbes. Yet, convincing experimental evidence is still lacking. Using a N-15 tracer, we assessed how deepened snow affects the temporal coupling between plant and microbial N utilization in a temperate Mongolian grassland. We found that microbial N-15 recovery peaked in winter, accounting for 22% of the total ecosystem N-15 recovery, and then rapidly declined during the spring thaw. By stimulating N loss via N2O emission and leaching, deepened snow reduced the total ecosystem N-15 recovery by 42% during the spring thaw. As the growing season progresses, the N-15 released from microbial biomass was taken up by plants, and the competitive advantage for N shifted from microbes to plants. Plant N-15 recovery reached its peak in August, accounting for 17% of the total ecosystem N-15 recovery. The Granger causality test showed that the temporal dynamics of plant N-15 recovery can be predicted by microbial N-15 recovery under ambient snow but not under deepened snow. In addition, plant N-15 recovery in August was positively correlated with and best explained by microbial N-15 recovery in March. The lower microbial N-15 recovery under deepened snow in March reduced plant N-15 recovery by 73% in August. Together, our results provide direct evidence of seasonal differences in plant and microbial N utilization that are conducive to ecosystem N retention; however, deepened snow disrupted the temporal coupling between plant-microbial N use and turnover. These findings suggest that changes in snowfall patterns may significantly alter ecosystem N cycling and N-based greenhouse gas emissions under future climate change. We highlight the importance of better representing winter processes and their response to winter climate change in biogeochemical models when assessing N cycling under global change.
学科主题	Biodiversity Conservation ; Ecology ; Environmental Sciences
电子版国际标准刊号	1365-2486
出版地	HOBOKEN
WOS关键词	FREEZE-THAW CYCLES ; HIGH-ARCTIC TUNDRA ; NITROGEN UPTAKE ; INORGANIC NITROGEN ; SEASONAL DYNAMICS ; NATURAL-ABUNDANCE ; SOIL RESPIRATION ; GROWING-SEASON ; FUNGAL GROWTH ; WINTER
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	WILEY
WOS记录号	WOS:000799784000001
资助机构	National Natural Science Foundation of China [31988102, 32101307, 32125025] ; Strategic Priority Research Program of the Chinese Academy of Science [XDA23080301, XDA26010303]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/28623]
专题	植被与环境变化国家重点实验室
作者单位	1.Ningde Normal Univ, Technol Res Ctr Characterist Med Plants Fujian, Sch Life Sci, Ningde, Fujian, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Jia, Zhou,Li, Ping,Wu, Yuntao,et al. Deepened snow loosens temporal coupling between plant and microbial N utilization and induces ecosystem N losses[J]. GLOBAL CHANGE BIOLOGY,2022,28(15):4655-4667.
APA	Jia, Zhou.,Li, Ping.,Wu, Yuntao.,Chang, Pengfei.,Deng, Meifeng.,...&Liu, Lingli.(2022).Deepened snow loosens temporal coupling between plant and microbial N utilization and induces ecosystem N losses.GLOBAL CHANGE BIOLOGY,28(15),4655-4667.
MLA	Jia, Zhou,et al."Deepened snow loosens temporal coupling between plant and microbial N utilization and induces ecosystem N losses".GLOBAL CHANGE BIOLOGY 28.15(2022):4655-4667.