Little direct effect of diurnal temperature amplitude on growing seasonal CO(2)fluxes in alpine humid shrubland, Qinghai-Tibetan Plateau

NWIPB OpenIR

	Little direct effect of diurnal temperature amplitude on growing seasonal CO(2)fluxes in alpine humid shrubland, Qinghai-Tibetan Plateau
	Zhu, Jingbin; Li, Hongqin; Zhang, Fawei; He, Huidan; Li, Yingnian; Yang, Yongsheng; Zhang, Guangru; Wang, Chunyu; Luo, Fanglin
	2020
发表期刊	ECOLOGICAL RESEARCH
卷号	35 期号:4
摘要	The amplitude of the diurnal temperature (ADT) has been decreasing under climate change, with substantial anticipated effects on alpine grassland carbon budgets. Here, we quantified the temporal response of the growing seasonal CO(2)fluxes to ADT over alpine shrubland on Qinghai-Tibetan Plateau (QTP) from 2003 to 2016. At a daily scale, net ecosystem exchange (NEE) and gross primary production (GPP) quadratically responded to ADT with optimum values of 15.4 and 13.4 degrees C, respectively. Ecosystem respiration (RES) negatively linearly correlated with ADT. Partial correlation, and classification and regression trees (CART) analysis, both showed that the maximal (MaxTa) or minimal air temperature (MinTa), rather than ADT, played much more important role in daily variations of CO(2)fluxes. At a monthly scale, GPP and NEE were both positively and negatively controlled by MaxTa while RES was negatively determined by MinTa, respectively. Monthly ADT exerted a negligible influence on monthly CO(2)fluxes. At an annual scale, only MaxTa played a significant role in variations of GPP and RES. NEE did not significantly respond to ADT, MaxTa or MinTa. The little direct correlations between NEE and ADT at daily, monthly or annual scales contradicts a previous hypothesis that a larger ADT would enhance carbon sequestration capacity over alpine ecosystems. Given the positive impact of MaxTa on GPP and MinTa on RES, our study would suggest that a decreasing ADT could indirectly stimulate more carbon loss and weaken the carbon sequestration capacity of alpine shrublands under the scenario of further increases in MinTa over QTP.
关键词	amplitude of diurnal temperature carbon fluxes classification and regression trees net ecosystem exchange Qinghai-Tibetan Plateau
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/60305
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Zhu, Jingbin,Li, Hongqin,Zhang, Fawei,et al. Little direct effect of diurnal temperature amplitude on growing seasonal CO(2)fluxes in alpine humid shrubland, Qinghai-Tibetan Plateau[J]. ECOLOGICAL RESEARCH,2020,35(4).
APA	Zhu, Jingbin.,Li, Hongqin.,Zhang, Fawei.,He, Huidan.,Li, Yingnian.,...&Luo, Fanglin.(2020).Little direct effect of diurnal temperature amplitude on growing seasonal CO(2)fluxes in alpine humid shrubland, Qinghai-Tibetan Plateau.ECOLOGICAL RESEARCH,35(4).
MLA	Zhu, Jingbin,et al."Little direct effect of diurnal temperature amplitude on growing seasonal CO(2)fluxes in alpine humid shrubland, Qinghai-Tibetan Plateau".ECOLOGICAL RESEARCH 35.4(2020).