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Volume Models for Single Trees in Tropical Rainforests in Tanzania

Received: 15 October 2014     Accepted: 31 October 2014     Published: 10 November 2014
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Abstract

The present study was the first to develop total tree, stem and branches volume models for rainforests in south-eastern Africa based on destructive sampling. The number of sample trees was 60 and diameter at breast height (dbh) and total tree height (h) ranged from 6 to 117 cm and from 6.4 m to 50 m, respectively. Large parts of the total volume and stem volume variations were explained by the models (Pseudo-R2 ranged from 0.85 to 0.93) and they performed relatively well over different size classes. When considering the challenges in height measurements in rainforests, we in general recommend applying model 3 with dbh only as independent variable. For large trees we recommend model 2 (dbh and h as independent variables) because of the moderating effect h has on volume predictions. If accurate stem volumes are needed for forestry licensing or for calculating compensation of timber loss, we also recommend model 2. As long as the allometry of the trees obviously is not different from that of our study site, the developed models may also be applied for rainforests elsewhere in Tanzania, but further testing of the models is also recommended.

Published in Journal of Energy and Natural Resources (Volume 3, Issue 5)
DOI 10.11648/j.jenr.20140305.12
Page(s) 66-76
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2014. Published by Science Publishing Group

Keywords

Total, Branches and Stem Volume, Form Factor, Destructive Sampling

References
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Cite This Article
  • APA Style

    Abel Malyango Masota, Eliakimu Zahabu, Rogers Ernest Malimbwi, Ole Martin Bollandsås, Tron Haakon Eid. (2014). Volume Models for Single Trees in Tropical Rainforests in Tanzania. Journal of Energy and Natural Resources, 3(5), 66-76. https://doi.org/10.11648/j.jenr.20140305.12

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    ACS Style

    Abel Malyango Masota; Eliakimu Zahabu; Rogers Ernest Malimbwi; Ole Martin Bollandsås; Tron Haakon Eid. Volume Models for Single Trees in Tropical Rainforests in Tanzania. J. Energy Nat. Resour. 2014, 3(5), 66-76. doi: 10.11648/j.jenr.20140305.12

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    AMA Style

    Abel Malyango Masota, Eliakimu Zahabu, Rogers Ernest Malimbwi, Ole Martin Bollandsås, Tron Haakon Eid. Volume Models for Single Trees in Tropical Rainforests in Tanzania. J Energy Nat Resour. 2014;3(5):66-76. doi: 10.11648/j.jenr.20140305.12

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  • @article{10.11648/j.jenr.20140305.12,
      author = {Abel Malyango Masota and Eliakimu Zahabu and Rogers Ernest Malimbwi and Ole Martin Bollandsås and Tron Haakon Eid},
      title = {Volume Models for Single Trees in Tropical Rainforests in Tanzania},
      journal = {Journal of Energy and Natural Resources},
      volume = {3},
      number = {5},
      pages = {66-76},
      doi = {10.11648/j.jenr.20140305.12},
      url = {https://doi.org/10.11648/j.jenr.20140305.12},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jenr.20140305.12},
      abstract = {The present study was the first to develop total tree, stem and branches volume models for rainforests in south-eastern Africa based on destructive sampling. The number of sample trees was 60 and diameter at breast height (dbh) and total tree height (h) ranged from 6 to 117 cm and from 6.4 m to 50 m, respectively. Large parts of the total volume and stem volume variations were explained by the models (Pseudo-R2 ranged from 0.85 to 0.93) and they performed relatively well over different size classes. When considering the challenges in height measurements in rainforests, we in general recommend applying model 3 with dbh only as independent variable. For large trees we recommend model 2 (dbh and h as independent variables) because of the moderating effect h has on volume predictions. If accurate stem volumes are needed for forestry licensing or for calculating compensation of timber loss, we also recommend model 2. As long as the allometry of the trees obviously is not different from that of our study site, the developed models may also be applied for rainforests elsewhere in Tanzania, but further testing of the models is also recommended.},
     year = {2014}
    }
    

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  • TY  - JOUR
    T1  - Volume Models for Single Trees in Tropical Rainforests in Tanzania
    AU  - Abel Malyango Masota
    AU  - Eliakimu Zahabu
    AU  - Rogers Ernest Malimbwi
    AU  - Ole Martin Bollandsås
    AU  - Tron Haakon Eid
    Y1  - 2014/11/10
    PY  - 2014
    N1  - https://doi.org/10.11648/j.jenr.20140305.12
    DO  - 10.11648/j.jenr.20140305.12
    T2  - Journal of Energy and Natural Resources
    JF  - Journal of Energy and Natural Resources
    JO  - Journal of Energy and Natural Resources
    SP  - 66
    EP  - 76
    PB  - Science Publishing Group
    SN  - 2330-7404
    UR  - https://doi.org/10.11648/j.jenr.20140305.12
    AB  - The present study was the first to develop total tree, stem and branches volume models for rainforests in south-eastern Africa based on destructive sampling. The number of sample trees was 60 and diameter at breast height (dbh) and total tree height (h) ranged from 6 to 117 cm and from 6.4 m to 50 m, respectively. Large parts of the total volume and stem volume variations were explained by the models (Pseudo-R2 ranged from 0.85 to 0.93) and they performed relatively well over different size classes. When considering the challenges in height measurements in rainforests, we in general recommend applying model 3 with dbh only as independent variable. For large trees we recommend model 2 (dbh and h as independent variables) because of the moderating effect h has on volume predictions. If accurate stem volumes are needed for forestry licensing or for calculating compensation of timber loss, we also recommend model 2. As long as the allometry of the trees obviously is not different from that of our study site, the developed models may also be applied for rainforests elsewhere in Tanzania, but further testing of the models is also recommended.
    VL  - 3
    IS  - 5
    ER  - 

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Author Information
  • Tanzania Forest Services (TFS), P.O. Box 40832, Dar es Salaam, Tanzania

  • Sokoine University of Agriculture, Department of Forest Mensuration and Management, P.O. Box 3013, Morogoro, Tanzania

  • Sokoine University of Agriculture, Department of Forest Mensuration and Management, P.O. Box 3013, Morogoro, Tanzania

  • Norwegian University of Life Sciences, Department of Ecology and Natural Resource Management, P.O. Box 5003, 1432 ?s, Norway

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