Ecological Archives A021-146-A1

S. Luyssaert, D. Hessenmöller, N. von Lüpke, S. Kaiser, and E. D. Schulze. 2011. Quantifying land use and disturbance intensity in forestry, based on the self-thinning relationship. Ecological Applications 21:3271–3283.

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
cdbh Scaling factor of the self-thinning relationship (-) Calculated from least-square fitting of Eq. 2b to N and dbh
Nmin, Nmax, NA, NB, Npristine Minimal and maximal observed stand density. Stand density for point A and B. Mean stand density of pristine forest. (trees ha-1) Observed
dmax Distance on the self-thinning curve between Nmin and Nmax Calculated from Eq. 2b and cdbh using the iterative procedure described in Appendix B
dAB Distance on the self-thinning curve between NA and NB Calculated from Eq. 2b and cdbh
dAB / dmax Relative distance between NA and NB (-) Calculated from dmax and dAB
LUDIp Planning component of the land use disturbance intensity (%) Calculated from Eq. 4 making use of dmax and dAB
Nobs, dbhobs, Observed stand density and diameter breast height (trees ha-1, m) Observed
dbhmax Maximum diameter at breast height for a stand with stand density Nobs (m) Calculated from Eq. 2b Nobs and cdbh
LUDIo Operational component of the land use disturbance intensity (%) Calculated from Eq. 5
LUDI Land use and disturbance intensity (%) Calculated from LUDIp and LUDIo
dbhmax-pristine Maximum diameter at breast height for a stand with stand density Npristine (m) Calculated from Eq. 2b and cdbh
dbhmaxx Largest individual tree diameter observed in pristine forest (m) Observed
Nmaxx Maximum stand density for a stand with dbhmaxx (trees ha-1) Calculated from Eq 2c and cdbh

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