气候变化领域集成服务门户(CCPortal): The response of CO2 fluxes to the amplitude of diurnal temperature in alpine meadow during growing season from 2002 to 2016 at the southern foot of Qilian Mountains

CCPortal

DOI	10.1360/TB-2020-0896
	The response of CO2 fluxes to the amplitude of diurnal temperature in alpine meadow during growing season from 2002 to 2016 at the southern foot of Qilian Mountains
	Zhu, Jingbin; Zhang, Fawei; Li, Hongqin; Yang, Yongsheng; Wang, Chunyu; Zhang, Guangru; Luo, Fanglin; He, Huidan; Li, Yingnian
通讯作者	He, HD (通讯作者)，Zaozhuang Univ, Coll Tourism Resources & Environm, Zaozhuang 277160, Peoples R China. ; Li, YN (通讯作者)，Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Peoples R China. ; Li, YN (通讯作者)，Chinese Acad Sci, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Peoples R China.
发表日期	2021
ISSN	0023-074X
EISSN	2095-9419
起始页码	85
结束页码	95
卷号	66 期号:1
英文摘要	Known as the Third Pole and Early-warning region of the world, the Qinghai-Tibetan Plateau (QTP) had an intense increase in surface temperature and marked change in the amplitude of diurnal temperature (ADT), which could have significant influences on the ecosystem carbon cycle. The increasing rate of the mean daily minimum temperature (MinTa) was about two times higher than that of maximum temperature (MaxTa) in the last five decades, and this asymmetric pattern has resulted in a smaller ADT, which substantially affected the plant phenology and vegetation productivity. The reduction in the ADT caused by global climate change would have a profound impact on the carbon balance of alpine ecosystems. However, the response of carbon budgets to the ADT over the QTP remained unclear. Here. we analyzed the 15-a growing seasonal (June-September) carbon fluxes (measured by the eddy covariance [EC] technique) in alpine meadow at the southern foot of Qilian Mountains, which is one of the most extensive vegetation types on the QTP. This study aimed to clarify how carbon fluxes respond to ADT at different temporal (daily, monthly and annual) scales in alpine meadow and to understand their potential response to future climate change. The results indicated that both the MaxTa and MinTa showed bell-shaped seasonal patterns, whereas the ADT failed to show an obvious trend during the growing season from 2002 to 2016. Besides, there was a non-significant increase in annual MaxTa. MinTa and ADT (P>0.05). Meanwhile, daily gross primary productivity (GPP) and ecosystem respiration (Re) exhibited a single-peaked trend that increased and then decreased. whereas daily net ecosystem CO2 exchange (NEE) showed a v-shaped trend. The alpine meadow ecosystem is a carbon sink during the growing season. and the annual NEE, GPP. and Re were -230.4 +/- 17.3.668.8 +/- 25.5, 438.3 +/- 27.5 g C m(-2) respectively. Moreover, the annual GPP and Re of alpine meadow in the growing season showed a significant increase trend (P<0.05), but the annual NEE showed no significant inter-annual change trend (P>0.05). Annual CO, fluxes were not related annual ADT. Only annual MaxTa exerted significant influence on variations in annual GPP and Re. Interestingly, the slopes of GPP and Re with respect to MaxTa were similar, also indicating the little impact of MaxTa on annual NEE. On a monthly scale, ADT exerted a negligible influence on CO2 fluxes (P>0.05), but there were significant correlations between MinTa and MaxTa with CO2 fluxes. On a daily scale, there was a significant quadratic relationship between daily NEE and ADT during the whole growing season (P<0.001), with a threshold of 19.8 degrees C. However. linear regression analysis showed that there was a significant negative correlation (P<0.001) between daily NEE and daily ADT in June, July, August and September, respectively. On the whole, the increase in ADT is beneficial to carbon sequestration of the alpine meadow ecosystem. Therefore, the results suggest that the decrease in ADT in the future will cripple the carbon sink of the alpine meadow ecosystem on the Qinghai-Tibetan Plateau.
关键词	CARBON-CYCLE FEEDBACK ECOSYSTEM RESPIRATION WATER-VAPOR EXCHANGE GRASSLAND COMPONENTS SHRUBLAND ENERGY
英文关键词	Qinghai-Tibetan Plateau; alpine meadow; amplitude of diurnal temperature; CO2 fluxes
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000606332500009
来源期刊	CHINESE SCIENCE BULLETIN-CHINESE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254250
作者单位	[Zhu, Jingbin; He, Huidan] Zaozhuang Univ, Coll Tourism Resources & Environm, Zaozhuang 277160, Peoples R China; [Zhang, Fawei; Yang, Yongsheng; Wang, Chunyu; Zhang, Guangru; Luo, Fanglin; Li, Yingnian] Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Peoples R China; [Li, Hongqin] Luoyang Normal Univ, Coll Life Sci, Luoyang 471934, Peoples R China; [Zhang, Fawei; Yang, Yongsheng; Wang, Chunyu; Zhang, Guangru; Luo, Fanglin; Li, Yingnian] Chinese Acad Sci, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Jingbin,Zhang, Fawei,Li, Hongqin,et al. The response of CO2 fluxes to the amplitude of diurnal temperature in alpine meadow during growing season from 2002 to 2016 at the southern foot of Qilian Mountains[J]. 中国科学院西北生态环境资源研究院,2021,66(1).
APA	Zhu, Jingbin.,Zhang, Fawei.,Li, Hongqin.,Yang, Yongsheng.,Wang, Chunyu.,...&Li, Yingnian.(2021).The response of CO2 fluxes to the amplitude of diurnal temperature in alpine meadow during growing season from 2002 to 2016 at the southern foot of Qilian Mountains.CHINESE SCIENCE BULLETIN-CHINESE,66(1).
MLA	Zhu, Jingbin,et al."The response of CO2 fluxes to the amplitude of diurnal temperature in alpine meadow during growing season from 2002 to 2016 at the southern foot of Qilian Mountains".CHINESE SCIENCE BULLETIN-CHINESE 66.1(2021).