A list of variables provided by a single tree. These variable names are used when binding a tree to a expression. See also species parameter. See also the list of variables available at resource unit level resource unit variables and for sapling variables.
General variables
| year |
current simulation year. |
Tree variables
| id |
Unique id (integer) of the tree. |
| dbh |
diameter at breast height (cm) |
| height |
height (m) |
| ruindex |
ID of the RessourceUnit the tree belongs to |
| x |
position of the tree (x-direction) (m) |
| y |
position of the tree (y-direction) (m) |
| volume |
volume of the tree bole (m3) |
| lri |
current LightRessourceIndex (0..1) |
| leafarea |
current leafarea (m2) |
| lightresponse |
LightResonse (f(LRI)) (0..1) |
| stemmass |
stem biomass (kg ODM) |
| branchmass |
branch biomass (kg ODM) |
| rootmass |
root biomass (kg ODM) (fine + coarse roots) |
| foliagemass |
biomass of foliage (kg ODM) linked to leafarea by fixed conversion factor |
| age |
Age of tree (years) |
| opacity |
opacity factor of tree crown (based on leafarea and crown radius) |
| dead |
1: tree is dead, 0: tree is alive |
| stress |
stress level of tree (0..1), 0: no stress, 1: high stress |
| deltad |
last year’s dbh increment (cm) |
| afoliagemass |
foliage mass dervied from allometric equation |
| species |
index of tree species within this simulation. 0..n. Note, that species names are available as constants within expressions, thus e.g., ‘species=Psme’ is valid. |
| basalarea |
basal area (m2) of the individual tree. |
| crownarea |
area of the crown (m2) (derived from LIP-stamp crown radius) |
| markharvest |
1 if trees is flagged for (future) harvests (0 otherwise) |
| markcut |
1 if trees is flagged for (future) cut-down (0 otherwise) |
| markcrop |
1 if trees is flagged as being a crop tree (0 otherwise) |
| markcompetitor |
1 if trees is flagged as a competitor (to a crop tree) (0 otherwise) |