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	Comparative analysis of temperature and CO2 fluxes for winter wheat in Tibetan Plain and North China Plain using the EMD method
	Zhaoyang J. ; Qiang Y. ; Shuhe L. ; Tianduo W. ; Xiaomin S. ; Renhua Z.
	2006
关键词	empirical mode decomposition (EMD) intrinsic mode function (IMF) flux Hilbert transform wheat Tibet water-vapor exchange hilbert spectrum deciduous forest carbon-dioxide model photosynthesis conductance transpiration canopy leaf
英文摘要	Comparative study of spectral properties of temperature and CO2 fluxes measured by eddy covariance method at Yucheng (36 degrees 57'N, 116 degrees 36'E, 28 m a. s. l., in the North China Plain) and at Lhasa (29 degrees 41'N, 91 degrees 20'E, 3688 m a. s. l., on the Tibetan Plateau) is described using the empirical mode decomposition (EMD) method. The main results are: (1) The intrinsic oscillation modes or intrinsic mode functions (IMFs) were extracted from data of temperature (T) and CO2 fluxes (F) measured at Yucheng (T-1 and F-1) and Lhasa (T-2 and F-2). (2) Hilbert transform was applied to these IMF components, then the Hilbert-Huang spectra and the marginal spectra of these data were obtained. (3) Comparison of temperature and CO2 fluxes in North China Plain and on Tibetan Plain illustrated that the characteristic frequencies corresponding to T-1, F-1, T-2 and F-2 are 0.05 Hz, 0.03 Hz, 0.014 Hz and 0.005 Hz, respectively.
出处	Progress in Natural Science
卷	16
期	10
页	1066-1071
收录类别	SCI
语种	英语
ISSN号	1002-0071
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22281]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Zhaoyang J.,Qiang Y.,Shuhe L.,et al. Comparative analysis of temperature and CO2 fluxes for winter wheat in Tibetan Plain and North China Plain using the EMD method. 2006.

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