干旱区生态环境知识资源中心(Arid): Carbon flux dynamics and influencing factors in a semi-arid dune ecosystem of northern China

Arid

DOI	10.1016/j.jenvman.2024.121696
	Carbon flux dynamics and influencing factors in a semi-arid dune ecosystem of northern China
	Li, Xia; Liu, Tingxi; Guan, Huade; Batelaan, Okke; Duan, Limin; Tong, Xin; Wang, Guanli
通讯作者	Liu, TX
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2024
卷号	366
英文摘要	The dune ecosystem plays a significant role in the global carbon cycle. The Horqin Sandy Land is a typical semi-arid fragile ecosystem in northern China. Understanding the magnitudes and dynamics of carbon dioxide fluxes within this region is essential for understanding the carbon balance. Used 6 years (2013-2018) measurements from an eddy-covariance system, we analyzed the dynamic patterns of net ecosystem carbon exchange (NEE), gross primary production (GPP), and ecosystem respiration (Reco) of the dune ecosystem in Horqin Sandy Land and examined their responses to climate factors with a focus on the precipitation. The results showed that the NEE of the dune ecosystem fluctuated from -166 to 100 gCO(2)m(-2)year(-1) across the 6 growing seasons, with an average of -56 gCO(2)m(-2)year(-1). The precipitation was not a key factor influencing the carbon flux variability. During the mid-growth stage, GPP was primarily affected by the effective precipitation frequency (R-2 ranging from 0.65 to 0.85, P < 0.05), followed by fractional vegetation cover (R-2 ranging from 0.65 to 0.68, P < 0.05). However, in the early and late growth stages, temperature predominantly drove the carbon flux (R-2 = 0.75, P < 0.01). The interannual variability of carbon flux can be predominantly elucidated by phenological indicators such as CO2 uptake (CUstart), end of CO2 uptake (CUend), CO2 uptake period (CUP), and Spring lag. The results demonstrated the dune ecosystem is a weak carbon sink in semi-arid ecosystems. Furthermore, we emphasized the significance of effective precipitation frequency in regulating carbon fluxes. Our results provide a foundational understanding of the carbon balance in semi-arid ecosystems.
英文关键词	Net ecosystem carbon exchange Gross primary production Ecosystem respiration Effective precipitation frequency Semi -arid area
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001272770400001
WOS关键词	INTERANNUAL VARIABILITY ; DIOXIDE EXCHANGE ; USE EFFICIENCY ; CO2 EXCHANGE ; NET ; LAND ; PRECIPITATION ; PRODUCTIVITY ; GRASSLAND ; TEMPERATURE
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404490
推荐引用方式 GB/T 7714	Li, Xia,Liu, Tingxi,Guan, Huade,et al. Carbon flux dynamics and influencing factors in a semi-arid dune ecosystem of northern China[J],2024,366.
APA	Li, Xia.,Liu, Tingxi.,Guan, Huade.,Batelaan, Okke.,Duan, Limin.,...&Wang, Guanli.(2024).Carbon flux dynamics and influencing factors in a semi-arid dune ecosystem of northern China.JOURNAL OF ENVIRONMENTAL MANAGEMENT,366.
MLA	Li, Xia,et al."Carbon flux dynamics and influencing factors in a semi-arid dune ecosystem of northern China".JOURNAL OF ENVIRONMENTAL MANAGEMENT 366(2024).