TABLE 3

Environmental Asset Functions for Pinus sp., Quercus ilex, and Q. suber for the Main Scenario

VariableaPinus sp.Quercus ilex
EAPrEACEAPrEAC
Coef.Std. Err.(3)Coef.Std. Err.Coef.Std. Err.Coef.Std. Err.
Constant227.75***51.22303.10***86.411,253.78***18.2891.43***30.89
Slope−407.48438.46−87.941,603.64−217.67*122.45658.69***115.47
Density (BA)12.64***2.4879.32***10.73−15.29***0.7448.22***1.29
HMQ−424.64**165.71429.93***24.91436.15***22.67
EAF−200.39***15.12−236.72***19.39
Pinea454.69***62.82
R20.350.590.520.80
Number of observations1711711,3171,317
 Quercus suberQuercus sp.Pinus sp.
EAPrEACEAWEAW
Coef.Std. Err.Coef.Std. Err.Coef.Std. Err.Coef.Std. Err.
Constant1,713.79***483.80303.43***68.35678.26***73.36317.27***52.25
Slope5,433.83*3,184.9899.91313.613,411.47***495.71−355.48431.01
Density (BA)53.79***15.9933.97***2.24−8.21***2.232.123.63
Q1−1,981.28***354.82
Q2−1,382.77***270.37
Q44,726.77***464.97
Suber473.78***59.73
Halep−218.42***48.26
Nigra779.04**340.53
Pinst121.93139.07
R20.380.500.060.25
Number of
observations7207202,037171

  • Note: EAPr, environmental asset value of silvopastoral provisioning services; EAC, environmental asset value of carbon sequestration; EAW, environmental asset value of water provisioning service. Data for the main scenario: discount rate = 3%; price level 2010 = 1.0. Robust standard error.

  • ↵a Slope gradient is estimated as a percentage; density (BA) is the basal area in m2/ha. The remainder are dummies: HMQ is high-medium quality; EAF is even-aged forest; Suber, Halep, Nigra, and Pinst are Quercus suber, Pinus halepensis, P. nigra, and P. pinaster forests, respectively; and Q1, Q2, and Q4 are the cork quality indexes (Q1 being the lowest and Q4 the highest).

  • ↵* p<0.10;

  • ↵** p<0.05;

  • ↵*** p<0.01.