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David Humphries

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Everything posted by David Humphries

  1. David Humphries
    There are roughly 150 of the 650 plots landing within private residential locations. These addresses will be pre-notified of the visits to hopefully enable access. When the Torbay survey took place only 2 out of the 70 plots that were within residential sites were unable to be recorded. It will be interesting to see how Londons property owners/tennants react On the day of the training the group were accosted by a grounds maintenance guy for 'trespassing' within his planting scheme .
  2. David Humphries
    The training involves looking at the size of the 650 (randomly located) plots and the issues that may arise for the three member teams when they come to survey them. The 11.3m radius plots (rough size in images below) will be marked out and have two landmarks tagged against the Tree measurement point. data to be recorded will include; % of area able to be plotted on the day Total tree cover % of shrub cover Plantable space Land use (residential, park, utility, Agri etc......) Ground cover (bare soil, grass, trarmac etc...) Tree & shrub information (Id, dimensions, % of crown dieback, light exposure etc....) .
  3. David Humphries
    For those who are not involved but are interested, I will try and update the thread regarding the progress of the project. As Nick elluded to, the training for the volunteers & team leaders has begun. There is a wide mix of people involved from TO's & Tree proffessionals through to tree wardens, students, retirees & local open space user group members. The London project is now regarded as being the largest City scale tree survey ever undertaken by volunteers with close on 300 people now involved. .
  4. David Humphries
    I suppose what we don't know is the scale of Sean's shot I think seans annual rings are a lot narrower than either of the two examples above, which may account for how big they look. .
  5. David Humphries
    Early spring wood xylem vessels within annual rings of partially white rotted Turkey oak. Two areas of differing levels of degradation shown......... .
  6. David Humphries
    Early spring wood xylem vessels within annual rings of brown rotted native oak. Two areas of differing levels of degradation shown......... .
  7. David Humphries
    here, the remnants of turkey oak that has been white rotted by Ganoderma resinaceum. Pretty much just leaving the medullary rays intact. The rays are formed with parenchyma cells which are predominantly made up of cellulose. Fantastic invertebrate habitat, it literally crawled with millipedes, wood lice and beetles .
  8. David Humphries
    yes, the middle lamella is a pectin layer which binds adjoining cells together. What I was trying to get across (to myself, as I continue to learn about this stuff, as well as to others who pehaps like to learn along) is that the brown rot (due to its prefered food source) will be leaving the lignin chemically and physiologically unchanged. Because of this, I don't believe that the xylem vessels (drinking straws in essence which are the large water transfering holes/tubes created in the early spring wood) being partly made up of lignin, will enlarge or shrink as the lignin will remain intact, (only the cellulose/hemi cellulose is altered/diminished) If any one has reference that shows that the xylem vessels are altered in size due to the effect of brown rot, please feel free to post up .
  9. David Humphries
    I'm not entirely convinced that what we can see in this shot is 'enlargement' of the vessels by decay, I think the 'holes' are just the cell lumen (the central void within the primary and secondary cell walls) I think they look 'large' because it's a ring porous species and these will be the large spring vessels. From how I understand it, the brown rot of Laetiporus will be degrading the hemicellulose & cellulose of the cell wall structures which is surrounded by the unchanged/undegraded lignin within the middle lamella, primary and secondary cell walls. .
  10. David Humphries
    That first shot of the ring porous vessels is a cracker sean Would imagine your on the money with Laeti .
  11. David Humphries
    these man made landmarks would be hasher in their landscape without their accompanying urban forest .
  12. David Humphries
    Well done Chris certainly agree with that .
  13. David Humphries
    So when you come to sell these at an environmentally inspired gallery at some point, will you bump the price to take account of the life long visits to a chiropractor that you will undoubtedly have to endure, due to getting down in ridiculous positions to take repeated shots at wood-elf eye level? All in the name of art, eh Nice mate .
  14. David Humphries
    these branches were up to 5m in length & 7cm in diameter, .
  15. David Humphries
    ongoing management checking the Plane populations three times a year as per guidance, but still finding new Massaria branches whilst out doing other tasks & looking at other trees. Here's this mornings collection of infected branches whilst carrying out an oak proccessionary moth inspection. Worth looking up even when focussing on other things. Noted that the plane Anthracnose was starting to be fairly heavy also. .
  16. David Humphries
    Good to hear, thanks for providing more of the story I do get that the customer is usually in the strongest position, but it's the standing upright deadwood that is the most important and scarce type of invertebrate, bat & owl habitat. It's down to us Arbs to educate the masses .
  17. David Humphries
    Liked the idea of the internal camera, but did it really need to be removed to ground level ? Shocking loss of habitat in my opinion .
  18. David Humphries
    I see it across a wide range of species but probably oak more often. .
  19. David Humphries
    fair few Bee related threads knocking about already, here's the results of a 'search'....... Arbtalk.co.uk | Discussion Forum for Arborists - Search Results We could perhaps set a sticky thread in the ecology section? But it should have a vague 'tree' slant to it as there's loads of web bee resources out there already. .
  20. David Humphries
    ........particularly when you start looking for it .
  21. David Humphries
    I've found that its not too uncommon, but I'd imagine getting the opportunity to keep one & sell it is fairly rare. Any shots of it in its 'whole' tree setting? Inosculation - the grafting of two separate trees or parts of a tree .
  22. David Humphries
    really useful guide to the lepidoptera leaf miners in the UK, listing food plants as a key....... mine key .
  23. David Humphries
    The Major Oak at Sherwood Forest 11 years apart (thanks for the updated shots Agent Arb) .
  24. David Humphries
    No 'think' about it .
  25. David Humphries
    neighbour had a swarm in her laburnum this afternoon. .

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