Abstract
An effective technique to measure foliage chlorophyll concentration (Chl) at a large scale and within a short time could be a powerful tool to determine fertilization amount for crop management. The objective of this study was to investigate the inversion of foliage Chl vertical-layer distribution by bi-directional reflectance difference function (BRDF) data, so as to provide a theoretical basis for monitoring the growth and development of winter wheat and for providing guidance on the application of fertilizer. Remote sensing could provide a powerful tool for large-area estimation of Chl. Because of the vertical distribution of leaves in a wheat stem, Chl vertical distribution characteristics show an obvious decreasing trend from the top of the canopy to the ground surface. The ratio of transformed chlorophyll absorption reflectance index (TCARI) to optimized soil adjusted vegetation index (OSAVI) was called the canopy chlorophyll inversion index (CCII) in this study. The value of CCII at nadir, ±20 and ±30°, at nadir, ±30 and ±40°, and at nadir, ±50 and ±60° view angles were selected and assembled as bottom-layer Chl inversion index (BLCI), middle-layer Chl inversion index (MLCI), and upper-layer Chl inversion index (ULCI), respectively, for the inversion of Chl at the vertical bottom layer, middle layer, and upper layer. The root mean squared error (RMSE) between BLCI-, MLCI-, and ULCI-derived and laboratory-measured Chl were 0.7841, 0.9426, and 1.7398, respectively. The vertical foliage Chl inversion could be used to monitor the crop growth status and to guide fertilizer and irrigation management. The results suggested that vegetation indices derived from bi-directional reflectance spectra (e.g., BLCI, ULCI, and MLCI) were satisfactory for inversion of the Chl vertical distribution.
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Abbreviations
- Chl:
-
Chlorophyll concentration
- BRDF:
-
Bi-directional reflectance difference function
- TCARI:
-
Transformed chlorophyll absorption reflectance index
- CARI:
-
Chlorophyll absorption in reflectance index
- OSAVI:
-
Optimized soil adjusted vegetation index
- CCII:
-
TCARI/OSAVI
- BLCI:
-
Bottom-layer Chl inversion index
- MLCI:
-
Middle-layer Chl inversion index
- ULCI:
-
Upper-layer Chl inversion index
- RMSE:
-
The root mean squared error
- LOV:
-
Leaf orientation value
- LAD:
-
Leaf angle distribution
- VZA:
-
View zenith angles
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Acknowledgments
This work was subsidized by the National High Tech R&D Program of China (2006AA10A302, 2006AA10Z203, 2008AA10Z214), National Natural Science Foundation of China (40701119, 40701120), and Special Funds for Major State Basic Research Project (2007CB714406, 2005CB121103). The authors are grateful to Mr. Weiguo Li, and Mrs. Hong Chang for data collection. We also thank Dr. Benjiamin Li for his editing and improving of the paper.
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Wenjiang Huang is an associate professor of application of quantitative remote sensing in agriculture.
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Huang, W., Wang, Z., Huang, L. et al. Estimation of vertical distribution of chlorophyll concentration by bi-directional canopy reflectance spectra in winter wheat. Precision Agric 12, 165–178 (2011). https://doi.org/10.1007/s11119-010-9166-5
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DOI: https://doi.org/10.1007/s11119-010-9166-5