Relationships between GPP, Satellite Measures of Greenness and Canopy Water Content with Soil Moisture in Mediterranean-Climate Grassland and Oak Savanna

Table 2

Correlation coefficients (𝑟) between NDVI, VARI, NDWI, SASI, and instantaneous volumetric soil moisture (𝜃₁₀ and 𝜃₂₀) and 16-day average soil moisture (𝜃_{avg_10} and 𝜃_{avg_20}) in the open grassland (a) and oak savanna (b).

(a) Open grassland

	NDVI	VARI	NDWI	SASI
𝜃10	0.71	0.81	0.43	−0.45
𝜃20	0.69	0.79	0.41	−0.43
𝜃avg_10	0.74	0.82	0.46	−0.48
𝜃avg_20	0.72	0.80	0.44	−0.46

(b) Oak savanna

	NDVI	VARI	NDWI	SASI
𝜃20	0.65	0.79	0.45	−0.50
𝜃50	0.61	0.74	0.40	−0.44
𝜃avg_20	0.69	0.78	0.41	−0.49
𝜃avg_50	0.67	0.74	0.38	−0.45