Table
1. Criteria for the evaluation of champion trees in urban Hong
Kong
(1)
Species Score a.
geographical origin b.
species rarity * c.
aesthetic rating
(2) Dimension Score a.
tree height b.
crown diameter c.
DBH d.
relative height **
(3) Structure Score a.
trunk disposition b.
branching characteristics c.
crown development d.
epiphytic growth e.
wildlife habitat
(4) Condition Score a.
trunk b.
branch c.
foliage d.
root e.
pest and disease
(5)
Location Score a.
landscape value to site b.
relation to setting c.
presence of other trees d.
functional value e.
poor placement ***
(6) Special Score a.
extreme rarity b.
exceptional dimension c.
outstanding tree form d.
unusual habitat e.
notable botanical interest f.
landmark specimen g.
historical significance h.
personality association i.
others
(7) Overall Score [
(1) x (2) x (3) x (4) x (5) x(6) ] / 10 000
* Species rarity with reference to local urban
tree survey data (Jim, 1986, 1987).
** Calculated by (measured tree height/potential species height)
x 100%.
*** Deduction from Location Score.
