Fig. 3: Spectral-diversity–plant-diversity relationships at the alpha-scale depend on leaf area index (LAI).
From: Plant beta-diversity across biomes captured by imaging spectroscopy
Relationships between spectral alpha-diversity and a plant species richness (LAI 1: n = 157, P = NS; LAI 2: n = 165, r2 = 0.08, b = 3.23, t163 = 3.96, P < 0.001; LAI 3: n = 149, r2 = 0.05, b = 3.10, t147 = 3.05, P = 0.003; LAI 4: n = 118, r2 = 0.02, b = 2.65, t116 = 1.90, P = 0.06), b Shannon index (LAI 1: n = 157, r2 = 0.16, b = − 0.17, t155 = −5.54, P < 0.001; LAI 2: n = 165, P = NS; LAI 3: n = 149, r2 = 0.05, b = 0.21, t147 = 2.85, P = 0.005; LAI 4: n = 118, r2 = 0.05, b = 0.25, t116 = 2.70, P = 0.008), and c phylogenetic diversity (LAI 1: n = 157, P = NS; LAI 2: n = 164, r2 = 0.05, b = 0.02, t162 = 3.21, P = 0.002; LAI 3: n = 149, r2 = 0.04, b = 0.03, t147 = 2.60, P = 0.01; LAI 4: n = 118, r2 = 0.12, b = 0.06, t116 = 4.13, P < 0.001). As phylogenetic diversity measure we used phylogenetic species evenness (PSE). Significance was assessed using two-sided t-tests; colors represent four classes of LAI: LAI 1 = [0.13, 0.634], LAI 2 = (0.634, 1.183], LAI 3 = (1.183, 1.84], LAI 4 = (1.84, 3.80]). For spectral-diversity–plant-diversity relationships at the alpha-scale per site see Supplementary Fig. 3.
