Figure 1.
The Sacramento-San Joaquin River confluence and associated Delta within California’s Central Valley, USA. Locations of the Mayberry wetland impoundment and experimental site are indicated.
Table 1.
Previously identified relationships between leaf N concentration and hyperspectral vegetation indices.
Table 2.
Differences between Schoenoplectus acutus biophysical parameters within N-addition and control treatments based on permutation tests (N = 4 per treatment).
Table 3.
Relationship of plant biophysical parameters with potential biophysical, chemical, and remote sensing-based nitrogen predictors (N = 8); 95% CI is the bootstrap bias corrected, accelerated 95% confidence interval based on 10,000 bootstrap replicates.
Figure 2.
Reflectance spectra for treatments.
Averaged reflectance spectrum for N-addition and control plants (N = 4 each). The shaded grey areas represent ± one standard error. Spectra associated with foliar N in the literature are indicated, with corresponding citations in brackets.
Table 4.
Best new indices for each index type.