气候变化领域集成服务门户(CCPortal): Interannual characteristics and driving mechanism of CO2 fluxes in alpine shrubland ecosystem during growing season at the southern foot of Qilian Mountains

CCPortal

DOI	10.1360/TB-2021-0628
	Interannual characteristics and driving mechanism of CO2 fluxes in alpine shrubland ecosystem during growing season at the southern foot of Qilian Mountains
	He, Huidan; Li, Hongqin; Fu, Yiwen; Zhu, Jingbin; Zhang, Fawei; Yang, Yongsheng; Wang, Chunyu; Luo, Fanglin; Li, Yingnian
通讯作者	Zhu, JB (通讯作者)，Zaozhuang Univ, Coll Tourism Resources & Environm, Zaozhuang 277160, Peoples R China. ; Zhu, JB ; Zhang, FW (通讯作者)，Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Peoples R China. ; Zhang, FW (通讯作者)，Chinese Acad Sci, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Peoples R China.
发表日期	2022
ISSN	0023-074X
EISSN	2095-9419
起始页码	173
结束页码	183
卷号	67 期号:2
英文摘要	It is speculated that the cold and relatively humid climate in alpine ecosystems can facilitate the storage of soil carbon. Besides, these ecosystems play an important role in the carbon cycle on a global scale. Alpine ecosystems are also considered highly sensitive to the ongoing trend of global warming and are coupled with the local climate system through various forms of feedback. In some recent short-term observational studies, it has been suggested that the role of alpine ecosystems can vary between carbon sink, carbon neutrality and carbon source, with significant interannual variability as well as confounding abiotic and biotic effects manifested. However, their long-term carbon balance remains unclear due to the non-linear metabolism processes and the plasticity responses of ecosystem to climate variability. The informed knowledge about the inter-annual variations in ground-based carbon fluxes for such ecosystems can be applied to assist our predictions of their potential responses to climate change. Here, we analyzed the continuous net ecosystem CO2 exchange (NEE) measured with the eddy covariance technique over alpine shrubland on the northeastern Qinghai-Tibet Plateau (QTP) during the growing season (May-September) from 2003 to 2016. The purpose of this research is two-fold. On the one hand. it is aimed to reveal the pattern of changes in CO2 fluxes (gross primary production (GPP), ecosystem respiration (Re). and NEE) during the growing season. On the other hand, it is purposed to identify the environmental drivers for the change in seasonal and annual CO2 fluxes. According to the research results. monthly GPP and Re exhibited a single peak that increased and then decreased, whereas monthly NEE showed a V-shaped curve during the growing season from 2003 to 2016. With the alpine shrubland ecosystem as a carbon sink during the growing season, the annual NEE, GPP, and Re reached -143.8 +/- 30.5. 509.0 +/- 65.1, and 365.2 +/- 34.6 g C m(-2). respectively. Moreover. the annual GPP and Re in alpine shrubland during the growing season showed a significant increase (P<0.05), while the annual NEE showed no significant changes annually (P>0.05). At the monthly scale, the classification and regression trees (CART) analysis showed that aggregated growing season degree days (GDD) were the predominant determinant on variations in monthly NEE and monthly GPP. The changes in monthly Re were determined largely by soil temperature (T-s). In addition, the linear regression analysis was also carried out to show that the thermal conditions (GDD, T-s, T-s) in the growing season of the alpine shrub played a crucial role in the dynamics of CO2 fluxes. On an annual basis, the CO2 fluxes in the growing season were affected mainly by soil water content (SWC) and GDD. Moreover. there was a significant positive correlation observed between seasonal GPP and GDD (P<0.05) and a significant negative correlation found between seasonal NEE and GDD (P<0.05), despite no significant con elation discovered between seasonal GDD and Re (P<0.05). It indicates a greater sensitivity of GPP to temperature as compared to Re in the alpine shrub ecosystem during the growing season.
关键词	CARBON EXCHANGE WATER-VAPOR TIBETAN PLATEAU GRASSLAND VARIABILITY DIOXIDE GROWTH MEADOW
英文关键词	Qinghai-Tibet Plateau; alpine shrubland; CO2 fluxes; growing season; driving mechanism
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000754428500007
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/254377
作者单位	[He, Huidan; Zhu, Jingbin] Zaozhuang Univ, Coll Tourism Resources & Environm, Zaozhuang 277160, Peoples R China; [He, Huidan; Zhu, Jingbin; Zhang, Fawei; Yang, Yongsheng; Wang, Chunyu; 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; [Fu, Yiwen] Suzhou Univ, Coll Environm Mapping & Engn, Suzhou 234000, Peoples R China; [Zhang, Fawei; Yang, Yongsheng; Wang, Chunyu; 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	He, Huidan,Li, Hongqin,Fu, Yiwen,et al. Interannual characteristics and driving mechanism of CO2 fluxes in alpine shrubland ecosystem during growing season at the southern foot of Qilian Mountains[J]. 中国科学院西北生态环境资源研究院,2022,67(2).
APA	He, Huidan.,Li, Hongqin.,Fu, Yiwen.,Zhu, Jingbin.,Zhang, Fawei.,...&Li, Yingnian.(2022).Interannual characteristics and driving mechanism of CO2 fluxes in alpine shrubland ecosystem during growing season at the southern foot of Qilian Mountains.CHINESE SCIENCE BULLETIN-CHINESE,67(2).
MLA	He, Huidan,et al."Interannual characteristics and driving mechanism of CO2 fluxes in alpine shrubland ecosystem during growing season at the southern foot of Qilian Mountains".CHINESE SCIENCE BULLETIN-CHINESE 67.2(2022).