As I mentioned in a recent post, I am about to ask permission from the Tree Register to climb and accurately measuresome of the tallest trees in Britain. To help convince them that this is a good idea, I've been trying to think of other things that can be gained from actually climbing the trees. For example: documenting lichens, mosses and other epiphytes, inspection of any damage or decay and a close-up assesment of the leader shoot.

These trees aren't nearing the limits of their lifespans or height for their species so maybe more advanced research like measuring leaf growth vs height or composition of sap, soil and climate data is pointless here (and I'm not a botanist anyway so the best I could do is pass on data to those who will understand it).

However if anyone has any suggestions I would be very grateful.

Michael

... any suggestions at all guys?

A few points to consider..

1. Does the Tree Registry have jurisdiction over each of these trees?
I'm asking this because it's likely that individual champion trees are in a variety of locations, including public and private land. It's more likely that you'd need to get access permission from public land managers or private landowners to climb individual trees rather than from the Tree Registry.

2. Are there scientists active in Great Britain studying canopy biology and related ecosystems?
If you would like to get involved gathering research data it would make sense to contact scientists who are already working in this field and offer to assist them.

3. What is the source for the current measurements?
Is there a uniform system for the current measurements or are they coming from a variety of sources using different methods? The Tree Registry may not think there is a problem with the current measurements, or they may welcome your offer to provide more accurate measurement, it could go either way. If you haven't done this already I'd take a close look at current ground-_base_d and tree-_base_d measuring techniques so you can be prepared to discuss measuring options and suggest improved techniques if outdated or inaccurate techniques have been used to determine champion trees.

In the U.S. the Eastern Native Tree Society has published high-quality information about tree measuring techniques:
ENTS measuring guidelines

-moss

Thanks for replying Moss. In answer to your points:

1. The Tree Register (TROBI) doesn't have jurisdiction over the trees. However TROBI is a recognised organisation and does have _link_s with landowners, the Forestry Commission etc. on a professional and personal level (some of its patrons and members are themselves landowners) and so approaching these parties would best be done via TROBI.

2. To my knowledge there are no dedicated canopy researchers as such in Britain but I'm sure there must be some ecologists who have studied the canopy and may have even climbed into trees as a result. Thanks for the suggestion - I'll look into it.

3. The current height measurements were done with a sextant and more recently with laser clinometers. These methods have been found to be quite inaccurate with trees often needing remeasuring using the same method, coming up with results which differ, sometimes by a couple of metres!

As far as I know, only one company called Tree Dimension in north Wales has ever measured any of these trees by climbing it - the Lake Vyrnwy Douglas Fir, which is situated near them. They (as I'm sure any arborists in Britain are) didn't seem to be equipped for this kind of job - using a 60ft ladder to reach the first branches (scary!) I don't know how they climbed to the top from there but they dropped a length of rope from the top to measure the height (hardly accurate due to rope stretch). The result (62.5m) put this tree ahead of the 62m measured by laser for Dughall Mor in Scotland. A debate raged for 3 years over which country had the tallest tree until the Forestry Commission measured Dughall Mor by laser again, recording a height of 64m.

I'll take a look at the ENTS _link_ now. Again, thanks for your help.

Michael

Sounds like going through the Tree Registry make sense. It is a tricky business because no one likes their champion tree downgraded, you might need security backup Looks like you'll be blazing a new trail to make this happen. Good luck!
-moss

Pertaining to reasons to climb for research: Something that is growing greatly in importance here in the US is the comparison of native species (of anything - insect, bird, plant, etc) vs. non-native/introduced/invasive species.