干旱区生态环境知识资源中心(Arid): Drivers of carbon flux in drip irrigation maize fields in northwest China

Arid

DOI	10.1186/s13021-021-00176-5
	Drivers of carbon flux in drip irrigation maize fields in northwest China
	Guo, Hui; Li, Sien; Wong, Fuk-Ling; Qin, Shujing; Wang, Yahui; Yang, Danni; Lam, Hon-Ming
通讯作者	Li, S (corresponding author), China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China. ; Lam, HM (corresponding author), Chinese Univ Hong Kong, State Key Lab, Ctr Soybean Res, Hong Kong, Peoples R China. ; Lam, HM (corresponding author), Chinese Univ Hong Kong, Sch Life Sci, Hong Kong, Peoples R China.
来源期刊	CARBON BALANCE AND MANAGEMENT
ISSN	1750-0680
出版年	2021
卷号	16 期号:1
英文摘要	Background: Under the escalating threat to sustainable development from the global increase in carbon dioxide concentrations, the variations in carbon flux in the farmland ecosystem and their influencing factors have attracted global attention. Over the past few decades, with the development of eddy covariance technology, the carbon fluxes of farmlands have been determined in many countries. However, studies are very limited for drip irrigation maize the arid regions in northwestern China, which covers a large area where a mixed mode of agriculture and grazing is practiced. Results: To study the effects of drip irrigation on the net ecosystem productivity (NEE), ecosystem respiration (ER), gross primary production (GPP) and net biome productivity (NBP) in the arid regions of northwestern China, we measured the carbon flux annually from 2014 to 2018 using an eddy covariance system. Our results showed that the maize field carbon flux exhibited single-peak seasonal patterns during the growing seasons. During 2014-2018, the NEE, ER and GPP of the drip-irrigated maize field ranged between - 407 similar to - 729 g C m(-2), 485.46 similar to 975.46 g C m(-2), and 1068.23 similar to 1705.30 g C m(-2). In four of the 5 study years, the ER released back to the atmosphere was just over half of the carbon fixed by photosynthesis. The mean daily NEE, ER and GPP were significantly correlated with the net radiation (Rn), air temperature (Ta), leaf area index (LAI) and soil moisture (SWC). The results of path analysis showed that leaf area index is the main driving force of seasonal variation of carbon flux. When harvested removals were considered, the annual NBP was - 234 g C m(-2), and the drip-irrigated maize field was a carbon source. Conclusions: This study shows the variation and influencing factors of NEE, ER and GPP in the growth period of spring maize under film drip irrigation in arid areas of northwest China. The ecosystem was a carbon sink before maize harvest, but it was converted into a carbon source considering the carbon emissions after harvest. The variation of carbon flux was influenced by both environmental and vegetation factors, and its leaf area index was the main driver that affects the seasonal variation of carbon flux.
英文关键词	Carbon flux Drip-irrigated maize field Gross primary productivity Net ecosystem productivity Ecosystem respiration Net biome productivity
类型	Article
语种	英语
开放获取类型	Green Published, gold, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000646572000001
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349783
作者单位	[Guo, Hui; Li, Sien; Qin, Shujing; Wang, Yahui; Yang, Danni] China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China; [Wong, Fuk-Ling; Lam, Hon-Ming] Chinese Univ Hong Kong, State Key Lab, Ctr Soybean Res, Hong Kong, Peoples R China; [Wong, Fuk-Ling; Lam, Hon-Ming] Chinese Univ Hong Kong, Sch Life Sci, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Guo, Hui,Li, Sien,Wong, Fuk-Ling,et al. Drivers of carbon flux in drip irrigation maize fields in northwest China[J]. 中国农业大学,2021,16(1).
APA	Guo, Hui.,Li, Sien.,Wong, Fuk-Ling.,Qin, Shujing.,Wang, Yahui.,...&Lam, Hon-Ming.(2021).Drivers of carbon flux in drip irrigation maize fields in northwest China.CARBON BALANCE AND MANAGEMENT,16(1).
MLA	Guo, Hui,et al."Drivers of carbon flux in drip irrigation maize fields in northwest China".CARBON BALANCE AND MANAGEMENT 16.1(2021).