3). Using the upper and lower edges of NRV provides a more http://www.selleckchem.com/products/c646.html conservative estimate of restoration need based upon the variability a biophysical setting may experience over time. Based upon the first transition (e.g. row 1) in that biophysical setting’s rules table (Table 2) we determined if there was an over-abundance of hectares in the “excess” s-class and an under abundance in the “deficit” s-class. If no, we skipped that transition step. If yes, we “moved” hectares from the excess to the deficit s-class, such that the deficit s-class does not become overabundant and the excess s-class does not become under abundant relative to the NRV reference condition.
These “moved” hectares were then considered “restoration hectares” and were added to the tally for that particular transition category. We then recalculated the excess or deficit abundance of each s-class following the hypothetical GSK126 datasheet redistribution of acres between s-class in the previous step. Based upon the second transition in that biophysical setting’s rules table (row 2) we determined if there was an
overabundance in the “excess” s-class and a under abundance in the “deficit” s-class. If yes, we “moved” hectares following the same procedure as for the first priority transition and added them to the tally of restoration hectares. If no, we skipped this transition step. Docetaxel supplier This process was then repeated for all transition steps for all 1729 strata. Calculations were conducted using a custom Python script (Python Software Foundation) within ArcMap 10.1 (Environmental Systems Resources Institute, 2013). We determined the order of operation for each biophysical setting’s rules table based on the following logic. First we considered disturbance transitions that were analogous to the predominant historical disturbances
within that setting (e.g., thin/low fire for FRG I biophysical settings). Second we considered other disturbance transitions that were less common based on the biophysical setting’s historical disturbance regime. Third we considered successional transitions analogous to that setting’s historical growth dynamics. Fourth we considered other multi-step disturbance treatments, and fifth we considered multi-step successional treatments. To assess the potential bias introduced by the order of transitions we compared the number of all disturbance and all successional restoration hectares per biophysical setting and landscape unit combination calculated with the specified order of operation (Appendix A.5) versus a randomized order of operation. The absolute difference (mean ± 1 SD) in all disturbance and in all succession restoration hectares was inconsequential (1.8 ± 3.5% and 2.3 ± 4.8% of total hectares respectively per biophysical setting and landscape unit, n = 1729).