The Impact of Non-Photosynthetic Vegetation on LAI Estimation by NDVI in Mixed Grassland
Abstract
:1. Introduction
2. Methods
2.1. Study Area
2.2. Data Collection
2.3. The Relationship between Green Leaf Area Index (LAI), Photosynthetic Matter Area Index (NPVAI), Plant Area Index (PAI) and Green, Dead, and Mixed Normalized Difference Vegetation Index (NDVI)
2.4. Impact of NPV on Field Measured LAI by LAI-2000
3. Results
3.1. The Relationship between Green, Dead, PAI and Green, Dead, Mixed NDVI
3.2. Contribution of GV and NPV Cover on Field Measured PAI by LAI-2000
3.3. Validation of the Estimated Green LAI and NPVAI
4. Discussion
4.1. The Relationship between NDVI and LAI
4.2. Contribution of GV and NPV on In-Situ Measured PAI
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A
Abbreviations | Terms |
---|---|
LAI | Leaf Area Index |
NDVI | Normalized Difference Vegetation Index |
NPV | Non-Photosynthetic Vegetation |
NPVAI | Non-Photosynthetic Matter Area Index |
PAI | Plant Area Index |
GV | Green Vegetation |
GNP | Grasslands National Park |
ASD | Analytical Spectral Devices |
Appendix B
Community Type | Before Removing Green Vegetation | After Removing Green Vegetation | Dominant Species | ||
---|---|---|---|---|---|
NDVIHyper | LAI | NDVIHyper | LAI | ||
Disturbed community | 0.64 | 4.27 | 0.28 | 1.54 | Smooth brome Crested wheatgrass |
Sloped grassland | 0.52 | 2.83 | 0.25 | 1.18 | Western wheatgrass Needle-and-thread grass Blue grama grass |
Sloped grassland | 0.56 | 3.25 | 0.20 | 1.82 | Western wheatgrass Needle-and-thread grass Blue grama grass |
Sloped grassland | 0.36 | 0.46 | 0.27 | 0.21 | Western wheatgrass |
Sloped grassland | 0.46 | 1.22 | 0.24 | 0.72 | Western wheatgrass Needle-and-thread grass Blue grama grass |
Sloped grassland | 0.49 | 2.16 | 0.29 | 0.92 | Needle-and-thread grass Blue grama grass |
Upland grassland | 0.49 | 2.38 | 0.21 | 1.48 | Needle-and-thread grass Blue grama grass Northern wheatgrass |
Upland grassland | 0.39 | 3.44 | 0.15 | 2.07 | Western wheatgrass |
Valley grassland | 0.59 | 4.01 | 0.24 | 1.61 | Western wheatgrass Smooth brown Crested wheatgrass |
Valley grassland | 0.41 | 3.72 | 0.16 | 2.07 | Western wheatgrass |
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Site Data | Coefficient | Sum Sq | F | P | Explained Variation (%) | Relative Effects (%) |
---|---|---|---|---|---|---|
dead cover | 0.04151 | 60.532 | 68.333 | <0.001 | 15.45% | 39.67% |
green cover | 0.04139 | 92.056 | 103.92 | <0.001 | 23.50% | 60.33% |
residual | 239.177 | |||||
total | 391.765 | 38.95% | 100.00% |
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Xu, D.; An, D.; Guo, X. The Impact of Non-Photosynthetic Vegetation on LAI Estimation by NDVI in Mixed Grassland. Remote Sens. 2020, 12, 1979. https://doi.org/10.3390/rs12121979
Xu D, An D, Guo X. The Impact of Non-Photosynthetic Vegetation on LAI Estimation by NDVI in Mixed Grassland. Remote Sensing. 2020; 12(12):1979. https://doi.org/10.3390/rs12121979
Chicago/Turabian StyleXu, Dandan, Deshuai An, and Xulin Guo. 2020. "The Impact of Non-Photosynthetic Vegetation on LAI Estimation by NDVI in Mixed Grassland" Remote Sensing 12, no. 12: 1979. https://doi.org/10.3390/rs12121979