Abstract
This paper assesses the capability of hyperspectral remote sensing to estimate chlorophyll a (Chl a), chlorophyll b (Chl b), and chlorophyll a + b (Chl a + b) concentration at cherry leaf scale using a variety of spectral variables during the growth season. A field experiment was conducted in cherry orchard. The leaf reflectance spectra of cherry plants were acquired within 350–1050 nm wavelengths. A variety of spectral variables were mathematically computed based on the leaf spectra and transformation of reflectance spectra. The relationships between all of spectral variables and chlorophyll concentration were discussed. Estimating Chl a, Chl b, and Chl a + b concentration by stepwise linear regression method and curve estimation method were carried out. Results demonstrated that the best spectral variable for prediction of chlorophyll concentration was the new spectral variable (the first derivative of log (1/R741) and D751/D511), with the root mean square error prediction (RMSEP) of 4.802 mg L−1 for Chl a concentration, 1.659 mg L−1 for Chl b concentration, and 6.419 mg L−1 for Chl a + b concentration. It should be noted that spectral variables such as D715/D705, EBFR, D705/D722, and BND showed a good performance with the RMSEP of 5.768, 7.838, 12.146, and 14.437 mg L−1 for Chl a concentration, 1.795, 1.985, 1.765, and 3.164 mg L−1 for Chl b concentration, and 7.935, 11.49, 17.99, and 21.79 mg L−1 for Chl a + b concentration respectively. Further investigation is needed to evaluate the effectiveness of such techniques on other orchard varieties or at the canopy level.
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Abbreviations
- Chl:
-
Chlorophyll
- Chl a b, and a + b :
-
Chlorophyll a, b, and a + b.
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Acknowledgments
This research was financially supported by a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions and was also subsidized by major research projects of the National Natural Science Fund (Project 91025022). The authors wish to thank Dr. Rui Zhang at Huaihai Institute of Technology for his invaluable assistance during the fieldwork in China.
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Lu, X., Peng, H. Predicting Cherry Leaf Chlorophyll Concentrations Based on Foliar Reflectance Spectra Variables. J Indian Soc Remote Sens 43, 109–120 (2015). https://doi.org/10.1007/s12524-014-0397-1
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DOI: https://doi.org/10.1007/s12524-014-0397-1