Retrenchment Images

[rapalaman]

Here's one for you - sorry for the lack of quality - camera phone

[David Humphries]

Thanks for sharing

 

 

 

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[treeseer]

A few early images here show natural retrenchment; many others show human-induced crown regeneration.

 

Are you interested in solely the former?

 

https://meeting.psu.edu/p94y60hp9zi/ You're welcome to anything in there.

[David Humphries]

A few early images here show natural retrenchment; many others show human-induced crown regeneration.

 

Are you interested in solely the former?

 

https://meeting.psu.edu/p94y60hp9zi/ You're welcome to anything in there.

 

Thank you for sharing this Guy, will have a longer look at it later.

 

Looking at both but mainly the former.

 

 

 

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[treeseer]

Here's a 'before', a leaning oak with basal issues that is shedding its top.

 

The 'inner crown' is visible below the declining top. Pruning to condense the crown for treee health and stability involves cuts < 10 cm. Cuts larger than that to benefit fung and insects would seem to conflict with BS3998, and ZTV.

[treeseer]

an array of natural retrenchment

[treeseer]

Other trees in way but still the shedding top and lower regrowth are evident.

 

Q nigra maybe; MS, US

[David Humphries]

Thanks again for sharing Guy.

 

Is the term already within the relevant ANSI guide and well known to Arborists in the US?

 

 

 

 

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[Kveldssanger]

Some thoughts on retrenching trees: does the presence of mature trees with crown retrenchment correlate with the the visitation (for perching) and subsequent hunting success of birds of prey / scavengers (crows)? From observing the oaks in our fields, the retrenching crowns' dead branches / limbs are often used by sparrowhawks and crows in particular as perches, most likely because visibility is increased from such elevated and 'clear' platforms.

[David Humphries]

I would think that's a fair shout.

 

I often see kestrels at work resting and having a good look around on a protruding dead branch.

 

 

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