Dendrometer bands

We determine plot level wood productivity using multiple censuses of the forest plots and monthly dendrometer band measurements.To determine seasonal variation in NPPStem, we install dendrometer bands on a subsample of randomly selected trees (e.g. 200 per plot). The species identity and initial DBH of all trees (with and without dendrometers) are recorded at each plot during the census. Dendrometer diameter increment is recorded every month or every few months to capture seasonal variability. Data is converted to standing biomass using the adequate allometric equation. For example, the following allometric equation is derived from compiling data from destructive harvesting of 2410 trees ≥5cm from 27 study sites across the tropics (Chave et al., 2005):

AGB=0.0776*(ρ * (DBH2) * H)0.94 (1)

Where AGB is above-ground biomass (kg m-2), ρ is density of the wood, DBH is diameter at breast height (cm), and H is tree height (m). To convert biomass values into carbon, we may assume a wood carbon content of 50% (Roy et al., 2001, Malhi et al., 2004, Chave et al., 2005).

To calculate seasonal NPP, we need to scale measurements on the subsample of trees with dendrometer bands per plot to the entire plot (Girardin et al., 2010).

New recruits are included in the census measurements, and mortality rates are captured by teh dendrometer band measurements. Tree fern and palm growth is not well correlated with stem DBH expansion so could not be estimated with the allometric equation chosen. Instead, we include these plants as recruits in our NPP and stem biomass estimates, following Malhi et al. (2004).

Where are we working?

Bullet_red - Site Bullet_blue - Plot Bullet_yellow - Field station

Photos and images

Uploaded 8 Dec 2014 by Erika Berenguer. Copyright © 2022.

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


  • Thumb_b260_t1_xarope
  • Thumb_140821_xarope__bega__amanda_e_galo
  • Thumb_b260_t1_cipoz%c3%a3o2
  • Thumb_140822_stemless_palm
  • Thumb_b260_t1_cipoz%c3%a3o1
  • Thumb_b260_the_lonely_brazil_nut_tree
  • Thumb_wytham_026

Latest news

Older news


  • Thumb_malhi_pic_forest

    Yadvinder Malhi

    I am Professor of Ecosystem Science at Oxford University.
    I lead the Ecosystems Programme at the Environmental Change Institute, with a focus of understanding the functioning of tropical forests and...

  • Thumb_sam_0693

    Sam Moore

    I am a Post-doc at the University of Oxford, School of Geography and the Environment, Environmental Change Institute and I am currently implementing studies of carbon allocation and cycling at...

  • Thumb_nsr

    Norma Salinas

    I am a postdoctoral research assistant at the University of Oxford. I am working with plant traits along altitudinal gradients in tropical forests. My research involve many aspects of tropical...

  • Thumb_goldsmith

    Greg Goldsmith

    I am a tropical plant physiological ecologist with a particular interest in plant-water relations. My doctoral research, based at the University of California, Berkeley, focused on the impacts of drought...

  • Thumb_a

    Beisit Luz Puma Vilca

    I'm a Biologist , I followed my degree at the National University of San Antonio Abad del Cusco - Perú. I focus on plant physiology and cell metabolism.

  • Thumb_img_20181216_215424

    Vilma Champi Ayma

    Im a Biologist with degree at the National University of San Antonio Abad del Cusco - Perú, with interest to make studies regarding the climatic change.

  • Thumb_default

    Gregory Asner

    no details
  • Thumb_dscn0778

    Vianet Mihindou

    no details
  • Thumb_cg_profile_photo

    Cécile Girardin

    I coordinate carbon cycling data for the GEM network. I am an ecosystems scientist focussing on carbon dynamics of tropical forest ecosystems. Following my PhD at Oxford University School of...

  • Thumb_dscn0047

    Walter Huaraca Huasco

    Walter is an experienced botanist and plant biologist who focuses on carbon cycling in tropical forest ecosystems. He has been working on the Andes to Amazon transect established by the...

  • Thumb_barlow3

    Jos Barlow

    I'm interested in understanding how human activities influence the value of tropical forests for species conservation, ecosystem functioning and the livelihoods of local people.

  • Thumb_profile_photo

    Georgia Pickavance

    I am a Database Assistant, supporting the tropical forest database and associated research projects RAINFOR, Afritron and T-FORCES. I am studying for a Masters in GIS alongside my research...

  • Thumb_sdc14680

    Akwasi Duah-Gyamfi

    I am a Research Scientist with the Forestry Research Institute of Ghana (FORIG) with particular interest in the role of tropical forests in global carbon cycle/budget as well as population...

  • Thumb_default
  • Thumb_default
  • Thumb_2011-11-19_21.49.37

    Renata Freitag

    no details
  • Thumb_fred_babweteera

    Assoc Prof Fred Babweteera

    Fred Babweteera is the Director of Budongo Conservation Field Station and Regional Coordinator (AFRICA), Research and Conservation, Royal Zoological Society of Scotland.

    He is a highly motivated tropical forest ecologist...

  • Thumb_erika

    Erika Berenguer

    I am interested in the resilience of tropical forests in human-modified landscapes. Specifically, I investigate how human disturbances, such as selective logging and wildfires, impact carbon stocks in the Amazon.

  • Thumb_foto_esteban

    Esteban Alvarez

    I´m a PhD student in the Department of Ecology at the Alcalá of Henares University, Spain. Currently working with forest diversity, biomass, and dynamics in complex environmental gradients in Colombia.

  • Thumb_default

    Oliver Phillips

    My long-term research goal is to understand the dynamics of carbon and biodiversity across the world’s tropical forests, how these change with our changing climate, and how they may feedback...

  • Thumb_dr-martha-crockatt_cropped

    Martha Crockatt

    I am a Research Manager at Earthwatch (Oxford), leading the research on carbon cycling in fragmented temperate forests in Wytham Woods. Our data is collected with the assistance of Earthwatch...

  • Thumb_default

    Sandra Diaz

    no details
  • Thumb__mmm7065_copy3x4