Modeling winter wheat phenology and carbon dioxide fluxes at the ecosystem scale based on digital photography and eddy covariance data
Zhou, Lei(周磊); He, HL; Sun, XM; Zhang, L; Yu, GR; Ren, XL; Wang, JY; Zhao, FH
2013
Source PublicationECOLOGICAL INFORMATICS
Volume18Pages:69-78
Corresponding AuthorHe, HL
AbstractRecent studies have shown that the greenness index derived from digital camera imagery has high spatial and temporal resolution. These findings indicate that it can not only provide a reasonable characterization of canopy seasonal variation but also make it possible to optimize ecological models. To examine this possibility, we evaluated the application of digital camera imagery for monitoring winter wheat phenology and modeling gross primary production (GPP).

By combining the data for the green cover fraction and for GPP, we first compared 2 different indices (the ratio greenness index (green-to-red ratio, G/R) and the relative greenness index (green to sum value, G%)) extracted from digital images obtained repeatedly over time and confirmed that G/R was best suited for tracking canopy status. Second, the key phenological stages were estimated using a time series of G/R values. The mean difference between the observed phenological dates and the dates determined from field data was 33 days in 2011 and 4 days in 2012, suggesting that digital camera imagery can provide high-quality ground phenological data.

Furthermore, we attempted to use the data (greenness index and meteorological data in 2011) to optimize a light use efficiency CLUE) model and to use the optimal parameters to simulate the daily GPP in 2012. A high correlation (R-2 = 0.90) was found between the values of LUE-based GPP and eddy covariance (EC) tower-based GPP, showing that the greenness index and meteorological data can be used to predict the daily GPP. This finding provides a new method for interpolating GPP data and an approach to the estimation of the temporal and spatial distributions of photosynthetic productivity.

In this study, we expanded the potential use of the greenness index derived from digital camera imagery by combining it with the LUE model in an analysis of well-managed cropland. The successful application of digital camera imagery will improve our knowledge of ecosystem processes at the temporal and spatial levels.
KeywordDigital Camera Greenness Index Phenological Date Gross Primary Production Winter Wheat
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China 41071251;Chinese Academy of Sciences XDA05050600;Environmental Protection Public Welfare Industry Targeted Research Fund gyh5031103
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/28621
Collection生态系统网络观测与模拟院重点实验室_生态系统综合研究中心
Corresponding AuthorHe, HL
Recommended Citation
GB/T 7714
Zhou, Lei,He, HL,Sun, XM,et al. Modeling winter wheat phenology and carbon dioxide fluxes at the ecosystem scale based on digital photography and eddy covariance data[J]. ECOLOGICAL INFORMATICS,2013,18:69-78.
APA Zhou, Lei.,He, HL.,Sun, XM.,Zhang, L.,Yu, GR.,...&Zhao, FH.(2013).Modeling winter wheat phenology and carbon dioxide fluxes at the ecosystem scale based on digital photography and eddy covariance data.ECOLOGICAL INFORMATICS,18,69-78.
MLA Zhou, Lei,et al."Modeling winter wheat phenology and carbon dioxide fluxes at the ecosystem scale based on digital photography and eddy covariance data".ECOLOGICAL INFORMATICS 18(2013):69-78.
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