气候变化领域集成服务门户(CCPortal): Variations in seasonal and inter-annual carbon fluxes in a semi-arid sandy maize cropland ecosystem in China's Horqin Sandy Land

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DOI	10.1007/s11356-021-15751-z
	Variations in seasonal and inter-annual carbon fluxes in a semi-arid sandy maize cropland ecosystem in China's Horqin Sandy Land
	Niu, Yayi; Li, Yuqiang; Wang, Mingming; Wang, Xuyang; Chen, Yun; Duan, Yulong
通讯作者	Li, YQ (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, 320 Donggang West Rd, Lanzhou 730000, Peoples R China. ; Li, YQ (通讯作者)，Univ Chinese Acad Sci, Beijing 100049, Peoples R China. ; Li, YQ (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Naiman Desertificat Res Stn, Tongliao 028300, Peoples R China.
发表日期	2022
ISSN	0944-1344
EISSN	1614-7499
起始页码	5295
结束页码	5312
卷号	29 期号:4
英文摘要	Sandy cropland ecosystems are major terrestrial ecosystems in semi-arid regions of northern China's Horqin Sandy Land, where they play an important role in the regional carbon balance. Continuous observation of the CO2 flux was conducted from 2014 to 2018 using the eddy covariance technique in a sandy maize cropland ecosystem in the Horqin Sandy Land. We analyzed carbon fluxes (the net ecosystem exchange (NEE) of CO2, ecosystem respiration (R-eco), and the gross primary productivity (GPP) and their responses to environmental factors at different temporal scales using Random Forest models and correlation analysis. We found that the sandy cropland was a carbon sink, with an annual mean NEE of -124.4 g C m(-2) yr(-1). However, after accounting for carbon exports and imports, the cropland became a net carbon source, with net biome production ranging from -501.1 to -266.7 g C m(-2) yr(-1). At a daily scale, the Random Forest algorithm revealed that photosynthetic photon flux density, soil temperature, and soil moisture were the main drivers for variation of GPP, R-eco, and NEE at different integration periods. At a monthly scale, GPP and R-eco increased with increasing leaf area index (LAI), so the maize ecosystem's carbon sequestration capacity increased with increasing LAI. At an annual scale, water availability (precipitation and irrigation) played a dominant role in explaining inter-annual variability of GPP and R-eco. Affected by climate (e.g., precipitation) and field management (e.g., cultivation, irrigation), carbon fluxes differed greatly between years in the maize system.
关键词	SOIL ORGANIC-CARBON GROSS PRIMARY PRODUCTION NET PRIMARY PRODUCTION DIOXIDE EXCHANGE CO2 EXCHANGE PRECIPITATION PULSES GRASSLAND ECOSYSTEM NORTHEASTERN CHINA RESIDUE MANAGEMENT IRRIGATED MAIZE
英文关键词	Net ecosystem exchange (NEE); Gross primary productivity (GPP); Ecosystem respiration (R-eco); Eddy covariance; Horqin Sandy Land
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000687004900004
来源期刊	ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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/253609
作者单位	[Niu, Yayi; Li, Yuqiang; Wang, Mingming; Wang, Xuyang; Chen, Yun; Duan, Yulong] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, 320 Donggang West Rd, Lanzhou 730000, Peoples R China; [Niu, Yayi; Li, Yuqiang; Wang, Mingming; Wang, Xuyang; Chen, Yun; Duan, Yulong] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Niu, Yayi; Li, Yuqiang; Wang, Mingming; Wang, Xuyang; Chen, Yun; Duan, Yulong] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Naiman Desertificat Res Stn, Tongliao 028300, Peoples R China
推荐引用方式 GB/T 7714	Niu, Yayi,Li, Yuqiang,Wang, Mingming,et al. Variations in seasonal and inter-annual carbon fluxes in a semi-arid sandy maize cropland ecosystem in China's Horqin Sandy Land[J]. 中国科学院西北生态环境资源研究院,2022,29(4).
APA	Niu, Yayi,Li, Yuqiang,Wang, Mingming,Wang, Xuyang,Chen, Yun,&Duan, Yulong.(2022).Variations in seasonal and inter-annual carbon fluxes in a semi-arid sandy maize cropland ecosystem in China's Horqin Sandy Land.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,29(4).
MLA	Niu, Yayi,et al."Variations in seasonal and inter-annual carbon fluxes in a semi-arid sandy maize cropland ecosystem in China's Horqin Sandy Land".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 29.4(2022).