Welcome Guest 

Show/Hide Header

Welcome Guest, posting in this forum requires registration.





Pages: [1]
Author Topic: Tree Growth Measurement
Chilterns
Administrator
Posts: 169
Permalink
Post Tree Growth Measurement
on: September 4, 2012, 07:04
Quote

I saw a band fitted to an oak tree at Wytham Woods that had a spring device that allowed the band to expand as the tree grows. Presumeably this is an experimental tree growth measuring device.

Image

Can anyone confirm how this works ? and where can I buy / obtain such a device ?

Chilterns

Ken Hume
Administrator
Posts: 418
Permalink
Post Re: Tree Growth Measurement
on: September 8, 2012, 07:55
Quote

Dr. Martha Crockatt of Earthwatch [ http://www.earthwatch.org/europe ] has been in touch with information on how she fitted the above growth measurement bands to the trees at Wytham Wood. She informs me as follows :-

" The device that your member saw is indeed for measuring tree growth. When the band is first attached to the tree there is a 1-3 month settling-in period. The dendrometer is constructed so that the loose end of the packing tape is held under the spring. After the settling-in period a notch is cut into the band, and the loose end of the band moves away from the notch as the tree grows.

Here is a link to the methods for how to make them yourself, and descriptions of how they work.

http://www.ctfs.si.edu/data///documents/Plastic_Band_Dendrometer_Protocol_20091105.pdf

I'm not sure if you can actually buy pre-fabricated bands, but they are not complicated to make (see link). Here's another link to what is perhaps a simpler design for the same bit of equipment, but made out of metal instead of plastic. Again, pretty easy to make.

http://www.ctfs.si.edu/data///documents/Metal_Band_Dendrometer_Protocol_20100330.pdf

The advantage of using a dendrometer band rather than returning regularly with a tape measure is that the band remains in exactly the same position, so the measurements are much more reliable than a tape measure.

Let me know if you want to have a go at making either type and I can give you further advice.

Earthwatch have been working with Oxford University's Environmental Change Institute for the last few years looking at carbon cycling in forest edges and cores, using these bands to assess growth throughout the season. As tree diameter can be quite accurately related to volume and hence biomass, by recording tree growth throughout the season we can see how much carbon is being accumulated.

Hope that helps. If you do an internet search for dendrometer bands you'll find more info.

Best wishes,

Martha"

I have asked Martha if she could come along to the OWG AGM to be held at 13.45 on Saturday 15th September 2012 in the car park at Wytham Wood.

Ken Hume - Trustee OWG

David Rees
Newbie
Posts: 10
Permalink
Post Re: Tree Growth Measurement
on: September 10, 2012, 11:25
Quote

These gauges have an application in tree quality determination. When growing for high quality timber such as veneer, it is useful to try to maintain an even growth over a period of years, as measured in the sawmill as 'number of rings per inch'. In the wood these gauges could be used firstly to identify the top quality trees and secondly to provide an instant dbh reading (but only if the bands are made up using tape measure tapes). For the best trees, measurements would be useful in determining when to apply more thinning around the favoured crown to maintain growth within the desired limits. This is clearly impossible to achieve for large scale growers but possible for the small woodland owner/ enthusiast (... so lets make the most of it when the effects of woodland scale works for the small grower!).
If anyone is interested by these considerations, contact me at the Project office 01865 815427: I am gauging interest for developing and registering high quality stands of trees in Oxon.

Ken Hume
Administrator
Posts: 418
Permalink
Post Re: Tree Growth Measurement
on: September 10, 2012, 12:25
Quote

Unfortunately Martha can't make the AGM and has also advised that the cost of the kit to apply plastic banding is greater than that for metal banding. I suppose that this is where the Oxfordshire Woodland Group could help by purchasing the kit needed and then assisting owners to fix one or two of these devices (at nominal cost to the owner) either via the Oxfordshire Woodland Project or through Dan Bebber at Earthwatch who also might be prepared to help in this respect as part of their ongoing tree growth mesurement project.

Ken Hume

Chilterns
Administrator
Posts: 169
Permalink
Post Re: Tree Growth Measurement
on: September 16, 2012, 20:16
Quote

Image

I took another picture of the same oak tree almost two years after I took the first picture and then checked the measuring device which revealed that this big oak has expanded it's girth by almost exactly 1.5 inches in 2 years.

Note how the spring has expanded.

Chilterns

Chilterns
Administrator
Posts: 169
Permalink
Post Re: Tree Growth Measurement
on: June 23, 2013, 06:25
Quote

The same oak tree was measured in June 2013 and when comparing photographs taken of the same tree during September 2012 no significant growth is evident.

Image

A good place to learn more about choosing and fixing a dendrometer can be found at the National Wetlands Research Centre website.

Could this be related to the long cold winter and spring of 2012/13 ?

Chilterns

Pages: [1]
Mingle Forum by cartpauj
Version: 1.0.34 ; Page loaded in: 0.015 seconds.

Events Calendar

July  2017
Mon Tue Wed Thu Fri Sat Sun
   
  1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31  

Training

Download our .pdf here.

Up Coming Events

Annual General Meeting Saturday 15th September 2012 will be held at Wytham Wood, please contact us for details.