Retrenchment Images

[David Humphries]

Hello all

 

Retrenchment

 

"......roots are unable to finance new peripheral extension, being limited by the canopy having developed to its maximum capacity. Crown retrenchment defines the onset of the ancient phase - often the longest phase. Retrenchment can occur many times in the tree’s lifespan"

 

"peripheral dieback occurs as the tree redirects energy and

growth to the formation of a consolidated lower region of the crown"

 

(Fay, 2002/3)

 

I'm embarking on some research with others, that will look at this natural process a little further.

 

Part of this project will be looking to categorize the various stages/phases of natural retrenchment.

 

It will be very useful to try and pool as many images as we can.

If anyone can help us with providing images of different species at various stages of retrenchment, this would be greatly appreciated.

 

Of course, If we use any of these images they will be fully credited.

 

Some examples below, thanks for looking.

 

.

[10 Bears]

David - PM sent.

[sean]

Interesting stuff David. I have a fair few good examples from early to later stage. I will get some together for you.

[David Humphries]

Thank you Sean.

 

Look forward to seeing them.

 

 

 

.

[Kveldssanger]

Sounds interesting.

 

Attached is a retrenching ash. It's not massively old - I suspect the grazing of horses and the farming practices nearby have triggered the retrenchment.

 

https://i.imgur.com/sJfhBRm.jpg

 

I can get plenty more. Just veteran trees, or are you looking for 'pseudo'-veterans too (urban trees reducing mass)?

 

Note the magpie sitting in the top-right of the ash, too. Birds love them. An old oak right by the work depot that is a favourite of crows.

[David Humphries]

Thanks Chris, great image.

 

Yes, we're looking at trees across as wide a growing environment and age structure as possible.

 

 

 

.

[Kveldssanger]

I'll make sure I get pictures of any I come across, then. Both rural and urban.

[sean]

Hi David....

 

if any of these are suitable then please let me know and i can send you the files in a folder. I have more on my hard drive so will dig them out.

 

These are of various Oaks in Herts and Ashton Court. Also Sweet Chestnut.

 

The bottom one is a corker.

Edited September 21, 2015 by sean

[Quercus Robert]

Any good? It seems like I'm joking but it didn't look as bad as this when I was next to it.

[David Humphries]

Any good? It seems like I'm joking but it didn't look as bad as this when I was next to it.

 

 

Robert I think this is a declining tree in poor health rather than a retrenching tree.

 

Difficult to tell from that image I'm afraid.

 

Thanks for putting it up in the thread though.

 

 

 

.