Scale-Specific Controller of Carbon and Water Exchanges Over Wheat Field Identified by Ensemble Empirical Mode Decomposition

doi:10.1007/s42106-017-0005-8

	Scale-Specific Controller of Carbon and Water Exchanges Over Wheat Field Identified by Ensemble Empirical Mode Decomposition
	He, Liang 1; Li, Jun 2; Harahap, Mahrita 3; Yu, Qiang 3,4
刊名	INTERNATIONAL JOURNAL OF PLANT PRODUCTION
	2018-03-01
卷号	12 期号:1 页码:43-52
关键词	Multi-scale NEE LE Environmental factor Ensemble empirical mode decomposition
ISSN号	1735-6814
DOI	10.1007/s42106-017-0005-8
通讯作者	He, Liang(heliang_hello@163.com)
英文摘要	The exchange of carbon and water in the ecosystem is influenced not only by weather and climatic perturbations but also by vegetation dynamics. The relationship between carbon and water exchange and environment in agro-ecosystem across different temporal scales is not very often been quantified. Spectral analysis of eddy covariance measurements can identify the interactions between environmental and biological factors at multi-temporal scales. Here, we used a new method, ensemble empirical mode decomposition (EEMD), to study the temporal covariance between ecosystem exchange of carbon dioxide (NEE), latent heat flux (LE) and environmental factors in a winter wheat cropping system located at the North China Plain. The results showed that the NEE, LE and environmental factors can be decomposed into 12 significant quasi-period oscillations on various time-scales i.e. hourly, diurnal, weekly and seasonal timescales. Variance of NEE in diurnal, hourly, seasonal, weekly scale was 58.9, 29.6, 4.7, 0.6%, respectively. Variance of LE in diurnal, hourly, seasonal, weekly scale was 55.2, 15.5, 5.1, 1.8%, respectively. The largest of variance contribution is at diurnal time-scale from net radiation (R-n), wind speed (mu) and vapor pressure deficit (VPD) due to daily rhythms in solar radiation. The soil water content varied significantly at a relatively longer time-scale i.e. weekly and seasonal scale. Large variance contribution of ambient temperature (T) (63.4%) and VPD (33.6%) is in trend term due to the significant increasing seasonal trend from winter to summer. The correlation analysis indicated that NEE and LE was correlated highly with net radiation (R-n) at all time-scale, as well as with VPD, ambient temperature (T), and wind speed (mu) in diurnal scale and with soil water in seasonal time-scales. This implied that solar radiation contributed the main variation of carbon and water in short time-scale, i.e. hourly and diurnal. Soil water variation strongly correlated with the seasonal variation of NEE and LE. Furthermore, seasonal signals of NEE and LE synchronized with LAI, which indicated that carbon dioxide and water flux are also regulated by LAI in seasonal time-scale. The quantification of the variation explained by carbon and water fluxes and environmental factors across different temporal scales using EEMD improved the understanding of carbon and water process in a cropping system.
资助项目	National Natural Science Foundation[41371119]
WOS关键词	INTERANNUAL TIME SCALES ; TEMPORAL VARIABILITY ; MULTISCALE ANALYSIS ; SPECTRAL-ANALYSIS ; HARDWOOD FORESTS ; WAVELET ANALYSIS ; ADJACENT PINE ; CO2 ; ECOSYSTEM ; FLUXES
WOS研究方向	Agriculture
语种	英语
出版者	GORGAN UNIV AGRICULTURAL SCIENCES & NATURAL RESOURCES
WOS记录号	WOS:000428086100005
资助机构	National Natural Science Foundation
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/57164]
专题	中国科学院地理科学与资源研究所
通讯作者	He, Liang
作者单位	1.Natl Meteorol Ctr, 46 Zhongguancui South St, Beijing 100081, Peoples R China 2.Univ Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing, Peoples R China 3.Univ Technol Sydney, Sch Life Sci, POB 123, Broadway, NSW 2007, Australia 4.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	He, Liang,Li, Jun,Harahap, Mahrita,et al. Scale-Specific Controller of Carbon and Water Exchanges Over Wheat Field Identified by Ensemble Empirical Mode Decomposition[J]. INTERNATIONAL JOURNAL OF PLANT PRODUCTION,2018,12(1):43-52.
APA	He, Liang,Li, Jun,Harahap, Mahrita,&Yu, Qiang.(2018).Scale-Specific Controller of Carbon and Water Exchanges Over Wheat Field Identified by Ensemble Empirical Mode Decomposition.INTERNATIONAL JOURNAL OF PLANT PRODUCTION,12(1),43-52.
MLA	He, Liang,et al."Scale-Specific Controller of Carbon and Water Exchanges Over Wheat Field Identified by Ensemble Empirical Mode Decomposition".INTERNATIONAL JOURNAL OF PLANT PRODUCTION 12.1(2018):43-52.