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

Table 1

Regression models and statistics of relationships between GPP and lagged volumetric soil moisture at 10 cm in open grassland (𝜃₁₀) and at 20 cm in oak savanna (𝜃₂₀). All the relationships are significant at the 99% level.

(a) Open grassland

Year	Lag (day)	Period	Regression models	𝑅^2
2002	18	84–125	GPP=−4.293+44.217∗𝜃10	0.94
2003	15	121–150	GPP=−1.0791+17.161∗𝜃10	0.92
2004	24	63–101	GPP=−5.303+42.952∗𝜃10	0.73
2005	25	92–129	GPP=−4.663+47.295∗𝜃10	0.78
2006	20	96–136	GPP=−3.070+35.811∗𝜃10	0.92

(b) Oak savanna

Year	Lag (day)	Period	Regression models	𝑅^2
2002	22	84–125	GPP=−2.16+0.14∗𝜃20	0.79
2003	5	131–151	GPP=−1.14+0.11∗𝜃20	0.60
2004	20	69–92	GPP=−1.98+0.12∗𝜃20	0.52
2005	22	128–156	GPP=−0.56+0.1∗𝜃20	0.34
2006	20	126–150	GPP=−1.47+0.1822∗𝜃20	0.87