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	Exogenous N addition enhances the responses of gross primary productivity to individual precipitation events in a temperate grassland
	Guo Q.; Hu, Z. M.; Li, S. G.; Yu, G. R.; Sun, X. M.; Li, L. H.; Liang, N. S.; Bai, W. M.
	2016
关键词	rain-use efficiency nitrogen addition inner-mongolia soil respiration plant-responses ecosystem water pulses climate carbon
英文摘要	Predicted future shifts in the magnitude and frequency (larger but fewer) of precipitation events and enhanced nitrogen (N) deposition may interact to affect grassland productivity, but the effects of N enrichment on the productivity response to individual precipitation events remain unclear. In this study, we quantified the effects of N addition on the response patterns of gross primary productivity (GPP) to individual precipitation events of different sizes (P-size) in a temperate grassland in China. The results showed that N enrichment significantly increased the time-integrated amount of GPP in response to an individual precipitation event (GPP(total)), and the N-induced stimulation of GPP increased with increasing Psize. N enrichment rarely affected the duration of the GPP response, but it significantly stimulated the maximum absolute GPP response. Higher foliar N content might play an important role in the N-induced stimulation of GPP. GPPtotal in both the N-addition and control treatments increased linearly with Psize with similar Psize intercepts (approximately 5 mm, indicating a similar lower Psize threshold to stimulate the GPP response) but had a steeper slope under N addition. Our work indicates that the projected larger precipitation events will stimulate grassland productivity, and this stimulation might be amplified by increasing N deposition.
出处	Scientific Reports
卷	6
收录类别	SCI
语种	英语
ISSN号	2045-2322
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43235]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Guo Q.,Hu, Z. M.,Li, S. G.,et al. Exogenous N addition enhances the responses of gross primary productivity to individual precipitation events in a temperate grassland. 2016.

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