07, 2007 23:02 PST
Just back from Borneo where I met with Brett Mifsud and Tom
We surveyed many trees but because the ID is pretty tough
samples, we only recorded heights of trees that we climbed and
certain of species.
I am back in Alaska now and busy with classes and chairing my
department. We climbed and measured 9 trees including taller S.
faguetiana in Tawau Hills Park (THP) and some other tall Shorea,
and Koompassia specimens -- we also measured 3 other individuals
> 80 m
but have a good id for just one of these unclimbed specimens.
Here is the current list of trees greater than 265 feet tall
whose ID we
are reasonably certain of in THP:
1 S. faguetiana 290 feet (88.33m)
2 K. excelsa 281
feet (85.76m) Mengaris Knob
3 S. argentifolia 278 feet (84.85m)
4 S. superba 277
feet (84.41 m) Gergassi Ridge
5 Hopea nutans 272 feet (82.82m) Gaharu
6 S. johorensis 270 feet (82.39m)
7 S. smithiana 270 feet (82.27m)
8 S. gibossa 266
feet (81.1m) River Flats
These were all found in less than 2 square km. This rewrites the
species of the world list -- one more trip and I think we'll
biggest Rucker for any watershed in the world.
None of these are conifers. They are all tropical hardwoods
family Dipterocarpaceae, except the Koompassia excelsa which is
08, 2007 06:18 PST
Great to hear from you! Welcome back. Those trees sound awesome
rivaling BVP's Euch's for height! Do you think 300' is a
volume numbers on these or are they slender?
08, 2007 21:23 PST
We looked for a 300 footer, and still think there may be one
there -- it
will just take some more looking.
These are very difficult forests because the trees are tall and
a lot of intervening foliage. Plus climbing them is pretty
heat humidity ants and more. Plus tall!
The big Hopea was the fattest and we are thinking maybe 250
or so, but we did not have time for volume measures.
13, 2007 18:04 PST
Absolutely fantastic. Both the heights and the diversity of
trees is amazing.
Are any of these species deciduous? If so, I believe they would
the tallest deciduous trees in the world.
Are we going to have a chance to read more about these
forests in the future?
14, 2007 11:40 PST
The Koompassia excelsa is drought-deciduous, losing all of its
once. It is a legume, as well. The 85.67 m height is currently
documented champion -- there are rumors of other heights,
porrly documented and no doubt not accurately measured. The
heigh was tape dropped from about one m below the highest point!