Appendix A (TABLE A1). Overview of the variables, their units, and sources required for calculation LUDI.
Variable(s) | Description | Unit | Source |
N, dbh | Stand density and diameter at breast height | (trees ha^{-1}, m) | Observed |
c_{dbh} | Scaling factor of the self-thinning relationship | (-) | Calculated from least-square fitting of Eq. 2b to N and dbh |
N_{min}, N_{max}, N_{A}, N_{B}, N_{pristine} | Minimal and maximal observed stand density. Stand density for point A and B. Mean stand density of pristine forest. | (trees ha^{-1}) | Observed |
d_{max} | Distance on the self-thinning curve between N_{min} and N_{max} | Calculated from Eq. 2b and c_{dbh} using the iterative procedure described in Appendix B | |
d_{AB} | Distance on the self-thinning curve between NA and NB | Calculated from Eq. 2b and c_{dbh} | |
d_{AB} / d_{max} | Relative distance between N_{A} and N_{B} | (-) | Calculated from d_{max} and d_{AB} |
LUDI_{p} | Planning component of the land use disturbance intensity | (%) | Calculated from Eq. 4 making use of d_{max} and d_{AB} |
N_{obs}, dbh_{obs}, | Observed stand density and diameter breast height | (trees ha^{-1}, m) | Observed |
dbh_{max} | Maximum diameter at breast height for a stand with stand density N_{obs} | (m) | Calculated from Eq. 2b N_{obs} and c_{dbh} |
LUDI_{o} | Operational component of the land use disturbance intensity | (%) | Calculated from Eq. 5 |
LUDI | Land use and disturbance intensity | (%) | Calculated from LUDI_{p} and LUDI_{o} |
dbh_{max-pristine} | Maximum diameter at breast height for a stand with stand density N_{pristine} | (m) | Calculated from Eq. 2b and c_{dbh} |
dbh_{maxx} | Largest individual tree diameter observed in pristine forest | (m) | Observed |
N_{maxx} | Maximum stand density for a stand with dbh_{maxx} | (trees ha^{-1}) | Calculated from Eq 2c and c_{dbh} |