Table 4. Fragmentation indices for total forest cover combining all forest classes, and individual forest classes at each land-cover date. Euclidean nearest neighbor distance (ENN) was used to measure isolation, patch cohesion (PC) was used as an indicator for physical connectivity among like patches, and percentage of like adjacencies (PLA) was used as a measure of aggregation among similar patches.

Isolation: ENN (m) Connectivity: PC (%) Aggregation: PLA (%)
Category 1986 1996 2001   1986 1996 2001   1986 1996 2001
Forest cover 110.8 120.5 115.8 99.86 99.91 99.92 95.62 96.37 96.61
Natural forest 130.6 135.4 142.7 99.76 99.68 99.68 94.83 94.02 93.91
Reforestation 337.0 202.3 187.9 86.59 97.06 97.91 71.34 81.81 81.36
Charral 164.3 191.1 250.9 93.28 93.33 93.82 74.14 75.20 77.28
Secondary forest 526.4 215.7 227.9 83.46 89.09 92.68 67.39 70.48 74.05
Riparian forest 238.5 216.9 188.1 87.57 89.20 92.19 67.66 71.78 74.57