• GEM
  • Login
Gem-network-logo
Nerc-logo-small
  • Thumb_erika
    Erika Berenguer
    About 8 years ago
    Dendrometer bands,  Census,  Jos Barlow,  ECOFOR

    A few photos of ECOFOR's field sites and team. The project is now up and running. More from us to come soon.

    Cheers,
    Erika

    Thumb_b260_t1_xarope Thumb_140821_xarope__bega__amanda_e_galo Thumb_140822_stemless_palm Thumb_b260_t1_cipoz%c3%a3o1 Thumb_b260_t1_cipoz%c3%a3o2 Thumb_b260_the_lonely_brazil_nut_tree
    Add a comment
  • Thumb_p6220034
    Toby Marthews
    Over 8 years ago
    Soil depth profile,  Dendrometer bands,  Coarse litter fall,  RAINFOR methodologies,  Ground coarse litter mass,  Stem respiration,  Census,  Ingrowth cores,  Fine litter fall,  Soil respiration partitionning,  Soil respiration,  Rhizotrons

    Dear All,

    A new version of the RAINFOR-GEM manual is now out and here is the link: http://www.tobymarthews.com/rainfor-gem-manual-v30.html (it'll move across to the permanent URL at http://gem.tropicalforests.ox.ac.uk/page/resources very soon).

    I hope this is useful!

    Best regards,
    Toby

    Add a comment
  • Thumb_erika
    Erika Berenguer
    Over 8 years ago
    Dendrometer bands

    Hi all,

    Is there any reason for the preference of plastic dendrometer bands instead of metallic ones?

    • Thumb_p6220034
      Toby Marthews
      Over 8 years ago

      Hi Erika,
      Basically: it's a cost issue. Also, clipping the metallic band is much more difficult than the plastic band and often has to be done back at the lab rather than in the field.
      Toby

    Add a comment
  • Thumb_photo0133
    Jhon del Aguila Pasquel
    Almost 10 years ago
    Dendrometer bands,  Toby Marthews

    Dear Toby

    The minimum diameter we considered at Allpahuayo, Jenaro Herrera (Peru) and Ducke plots (Brazil) is 10 cm diameter, and it works very well. The trick is the way of dendrometer instalation, which should be standarized for getting the suitable form, it means the spring and the clips should have the exact size. Another thing I could see in Ducke was that the suitable clip material is aluminium which adjusts better to tree shape. Of course, there are some trees where it is a bit complicated to install, but this is a minimal amount.

    Best,

    Jhon

    Add a comment
  • Thumb_p6220034
    Toby Marthews
    About 10 years ago
    Dendrometer bands

    Dear All Who Have Worked With Dendrometer Bands,

    I have a question: what is the minimum diameter of stem on which you have attached a dendrometer? Below a certain cut-off diameter the dendroband doesn't fit snugly against the tree (because of the spring and the clips it becomes 'square' and sticks out even if the stem isn't irregular) and also below a certain cut-off the spring can't exert enough tension for the band to work as it should. At the moment, the RAINFOR-GEM manual doesn't specify what this cut-off is.

    I always thought that the cut-off was at about 20 cm diameter and that you can't attach dendrobands to stems smaller than that. I think I applied this minimum in the SAFE Fragment E plot. However I have a colleague (outside GEM) who is taking a cut-off of 30 cm GBH (i.e. 9.6 cm DBH). I asked her if she's sure she can go that small and she said not sure but she's going to try.

    Preassembled dendrometers claim they can be installed on stems down to 8 cm DBH (e.g. http://www.ictinternational.com.au/brochures/manualbanddendrometer_en_1.0.pdf ). Apparently, Cattelino et al. (1986) suggested a cut-off of 10 cm (http://www.ingentaconnect.com/content/saf/njaf/1986/00000003/00000002/art00012?crawler=true ) but for me I just don't believe this. I can't believe these would really be stable on the stem under heavy rain and/or high winds.

    So: in your experience, what's the smallest stem you've managed to attach a dendrometer to?

    Best,
    Toby

    Add a comment
  • Thumb_p6220034
    Toby Marthews
    Over 10 years ago
    Soil depth profile,  Dendrometer bands,  Coarse litter fall,  RAINFOR methodologies,  Ground coarse litter mass,  Stem respiration,  Census,  Ingrowth cores,  Fine litter fall,  Soil respiration partitionning,  Soil respiration,  Rhizotrons

    Apologies for cross-posting: After much debate and revisions between here and Leeds, the new version (2.2) of the RAINFOR-GEM Intensive Plots manual has now been uploaded on a new subpage of http://gem.tropicalforests.ox.ac.uk/ (see "Resources" on the left).

    This replaces the version 2.0 uploaded on GEM in February and also Dan Metcalfe's original v1.0 of the manual uploaded on http://www.geog.leeds.ac.uk/projects/rainfor/pages/manuals_eng.html (under “Measuring tropical forest carbon allocation and cycling”) and http://www.eci.ox.ac.uk/research/ecodynamics/carbon-balance.php (under “Online Materials” halfway down).

    Hope this is useful for everyone!
    Toby

    Add a comment
  • Thumb_terhi_walkway
    Terhi Riutta
    About 11 years ago
    Carbon dynamics in Wytham Woods,  Dendrometer bands

    Dendrometer band

    Thumb_wytham_026
    Add a comment
Copyright © 2023 Oxford University. All rights reserved. Site by TidyApps Ltd.