干旱区生态环境知识资源中心(Arid): Uncertainty in gap filling and estimating the annual sum of carbon dioxide exchange for the desert Tugai forest, Ebinur Lake Basin, Northwest China

Arid

DOI	10.7717/peerj.8530
	Uncertainty in gap filling and estimating the annual sum of carbon dioxide exchange for the desert Tugai forest, Ebinur Lake Basin, Northwest China
	Teng, Dexiong 1,2; He, Xuemin 1,2; Wang, Jingzhe 1,2; Wang, Jinlong 1,2; Lv, Guanghui1,2
通讯作者	Lv, Guanghui
来源期刊	PEERJ
ISSN	2167-8359
出版年	2020
卷号	8
英文摘要	In most eddy covariance (EC) studies, carbon flux measurements have a high defect rate for a variety of reasons. Obtaining the annual sum of carbon dioxide exchange requires imputation of data gaps with high precision and accuracy. This study used five methods to fill the gaps in carbon flux data and estimate the total annual carbon dioxide exchange of the Tugai forest in the arid desert ecosystem of Ebinur Lake Basin, Northwest China. The Monte Carlo method was used to estimate the random error and bias caused by gap filling. The results revealed that (1) there was a seasonal difference in the friction velocity threshold of nighttime flux, with values in the growing season and non-growing season of 0.12 and 0.10 m/s, respectively; (2) the five gap-filling methods explained 77-84% of the data variability in the fluxes, and the random errors estimated by these methods were characterized by non-normality and leptokurtic heavy tail features, following the Laplacian (or double-exponential) distribution; (3) estimates of the annual sum of carbon dioxide exchange using the five methods at the study site in 2015 ranged from -178.25 to -155.21 g C m(-2) year(-1), indicating that the Tugai forest in the Ebinur Lake Basin is a net carbon sink. The standard deviation of the total annual carbon dioxide exchange sums estimated by the five different methods ranged from 3.15 to 19.08 g C m(-2) year(-1), with bias errors ranging from -13.69 to 14.05 g C m(-2) year(-1). This study provides a theoretical basis for the carbon dioxide exchange and carbon source/sink assessment of the Tugai forest in an arid desert ecosystem. In order to explore the functioning of the Tugai forest at this site, a greater understanding of the underlying ecological mechanisms is necessary.
英文关键词	Carbon dioxide flux Tugai forest Uncertainty Eddy covariance Gap-filling
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000512759600014
WOS关键词	NET ECOSYSTEM EXCHANGE ; EDDY-COVARIANCE MEASUREMENTS ; INTERANNUAL VARIABILITY ; LONG-TERM ; QUALITY ASSESSMENT ; FLUX MEASUREMENTS ; OLD-GROWTH ; CO2 ; MODEL ; ENERGY
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
来源机构	新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315291
作者单位	1.Xinjiang Univ, Coll Resources & Environm Sci, Urumqi, Xinjiang, Peoples R China; 2.Xinjiang Univ, Key Lab Oasis Ecol, Educ Minist, Urumqi, Xinjiang, Peoples R China
推荐引用方式 GB/T 7714	Teng, Dexiong,He, Xuemin,Wang, Jingzhe,et al. Uncertainty in gap filling and estimating the annual sum of carbon dioxide exchange for the desert Tugai forest, Ebinur Lake Basin, Northwest China[J]. 新疆大学,2020,8.
APA	Teng, Dexiong,He, Xuemin,Wang, Jingzhe,Wang, Jinlong,&Lv, Guanghui.(2020).Uncertainty in gap filling and estimating the annual sum of carbon dioxide exchange for the desert Tugai forest, Ebinur Lake Basin, Northwest China.PEERJ,8.
MLA	Teng, Dexiong,et al."Uncertainty in gap filling and estimating the annual sum of carbon dioxide exchange for the desert Tugai forest, Ebinur Lake Basin, Northwest China".PEERJ 8(2020).