Table 1 Disturbance patch metrics selected to characterize the structure of disturbances (values rounded to two decimal places)
From: Landscape patterns in stand-replacing disturbances across the world’s forests
Class | Metric | Description | Unit | Theoretical range | Statistics for the disturbance patches | |||||
|---|---|---|---|---|---|---|---|---|---|---|
Mean | s.d. | Minimum | Maximum | 1st percentile | 99th percentile | |||||
Magnitude | Growth (count of years) | Number of years over which the patch showed continuous growth | Years | ≥1 | 1.07 | 0.28 | 1.00 | 8.00 | 1 | 3 |
Area | Patch area | ha | >0 | 1.08 | 60.43 | 0.09 | 221,025.49 | 0.09 | 12.06 | |
Shape | Shape index | Indicates the complexity of the patch shape, with increasing values indicating increasing complexity | Unitless | ≥1 | 1.20 | 0.41 | 0.98 | 142.88 | 0.98 | 2.71 |
Elongation | The extent to which a patch adopts a linear (1) or circular (0) form | Unitless | [0,1[ | 0.49 | 0.13 | 0.00 | 1.00 | 0.36 | 0.81 | |
Context | Spatial clustering | Number of concomitantly occurring surrounding patches within a 5 km radius from the centroid of the focal patch, reflecting whether a patch is isolated or part of a cluster | Patches | ≥0 | 120.08 | 141.69 | 0.00 | 4,155 | 2 | 667 |
Temporal clustering | Percentage of total area disturbed within a 5 km radius from the centroid of the focal patch, which occurred within a single year, reflecting whether forest loss is pulsatile or steady over time | % | >0 | 12% | 16% | 0% | 100% | 2% | 92% | |
