Table 2. Factors associated with changes in percentage tree cover (means with 95% confidence intervals in square brackets) within the Hukaung Valley landscape during two time periods.
Factor (transformation) | Change in percentage tree cover 2000–2005 | Change in percentage tree cover 2005–2010 |
---|---|---|
Altitude (metres, log) | 0.475 [0.400, 0.550] (16.5%) | 1.625 [1.560, 1.689] (84.5%) |
Slope (degrees, square root) | −0.018 [−0.043, 0.008] (6.0%) | −0.09 [−0.118, −0.063] (9.5%) |
Distance to drainage (rivers and streams, metres, square root) | 0.005 [0.004, 0.007] (5.5%) | 0.004 [0.002, 0.006] (4.5%) |
Distance to roads (metres, square root) | −0.008 [−0.009, −0.008] (25.0%) | −0.001 [−0.002, −0.000] (0.5%) |
Distance to communities (metres, square root) | 0.008 [0.007, 0.008] (10.5%) | 0.009 [0.008, 0.010] (11.5%) |
Inside concession (binary: yes/no) | −0.441 [−0.634, −0.248] (2.5%) | −6.489 [−6.220, −6.758] (97.0%) |
Distance to gold mine (metres, square root) | 0.019 [0.018, 0.020] (90.5%) | 0.007 [0.006, 0.007] (1.5%) |
Distances are measured in metres. Generalized least squares with constant power of covariance structure for altitude and a rational covariance function to correct for spatial correlation, over 200 repeated runs. Overall model p values were under 0.05 for 80% of models for 2000–2005, and 100% models for 2005–2010. Figures in square brackets show 95% CI of the means for 200 runs. P-values are summarised for each factor in round brackets as the percentage of values across 200 runs less than 0.05.