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Scale-Specific Controller of Carbon and Water Exchanges Over Wheat Field Identified by Ensemble Empirical Mode Decomposition
He, Liang1; Li, Jun2; Harahap, Mahrita3; Yu, Qiang3,4
2018-03-01
Source PublicationINTERNATIONAL JOURNAL OF PLANT PRODUCTION
ISSN1735-6814
Volume12Issue:1Pages:43-52
Corresponding AuthorHe, Liang(heliang_hello@163.com)
AbstractThe 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.
KeywordMulti-scale NEE LE Environmental factor Ensemble empirical mode decomposition
DOI10.1007/s42106-017-0005-8
WOS KeywordINTERANNUAL TIME SCALES ; TEMPORAL VARIABILITY ; MULTISCALE ANALYSIS ; SPECTRAL-ANALYSIS ; HARDWOOD FORESTS ; WAVELET ANALYSIS ; ADJACENT PINE ; CO2 ; ECOSYSTEM ; FLUXES
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation[41371119]
Funding OrganizationNational Natural Science Foundation
WOS Research AreaAgriculture
WOS SubjectAgronomy
WOS IDWOS:000428086100005
PublisherGORGAN UNIV AGRICULTURAL SCIENCES & NATURAL RESOURCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/57165
Collection中国科学院地理科学与资源研究所
Corresponding AuthorHe, Liang
Affiliation1.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
Recommended Citation
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.
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