On the geometry and allometry of big-buttressed trees - a challenge for forest monitoring: new insights from 3D-modeling with terrestrial laser scanning
In many old-growth natural and close-to-natural forest types, notably in humid tropical forests, a relatively small number of very tall trees contribute considerably to stand basal area and biomass. Such trees often show distinct buttress roots with irregular non-convex shapes. Buttresses are comple...
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doaj-9c27fcd27a7a4c7c838e49c815cf21ca2020-11-24T21:39:38ZengItalian Society of Silviculture and Forest Ecology (SISEF)iForest - Biogeosciences and Forestry1971-74581971-74582015-10-018157458110.3832/ifor1449-0071449On the geometry and allometry of big-buttressed trees - a challenge for forest monitoring: new insights from 3D-modeling with terrestrial laser scanningNölke N0Fehrmann L1I Nengah Surati J2Tiryana T3Seidel D4Kleinn C5Chair of Forest Inventory and Remote Sensing, Universität Göttingen, Büsgenweg 5, D-37075 Göttingen (Germany)Chair of Forest Inventory and Remote Sensing, Universität Göttingen, Büsgenweg 5, D-37075 Göttingen (Germany)Division of Forestry Planning, Department of Forest Management, Faculty of Forestry, Bogor Agricultural University (Indonesia)Division of Forestry Planning, Department of Forest Management, Faculty of Forestry, Bogor Agricultural University (Indonesia)Chair of Forest Inventory and Remote Sensing, Universität Göttingen, Büsgenweg 5, D-37075 Göttingen (Germany)Chair of Forest Inventory and Remote Sensing, Universität Göttingen, Büsgenweg 5, D-37075 Göttingen (Germany)In many old-growth natural and close-to-natural forest types, notably in humid tropical forests, a relatively small number of very tall trees contribute considerably to stand basal area and biomass. Such trees often show distinct buttress roots with irregular non-convex shapes. Buttresses are complex structures in the lowest stem section, where most tree biomass is located. The methods used to assess the diameter of buttressed trees have a large impact on the determination of volume and biomass, as well as on the resulting estimates of the aboveground carbon stock in tropical forests. As the measurement of diameter at breast height (DBH at 1.3 m) is not feasible in such conditions, the diameter above buttress (DAB), where the cylindrical bole of the tree begins, is usually measured and included as an independent variable in biomass models. We conducted a methodological study aimed at determining the volume and biomass of individual buttressed trees belonging to several tropical species by the application of terrestrial laser scanning (TLS). The geometry and allometry of the buttresses, as well as the change with height along the stem in buttress volume and cross-sectional area were analyzed. Our results suggest that the relationship between cross-sectional areas at DAB height (ADAB) and the actual tree basal area measured at 1.3 m height is relatively strong (R² = 0.87) across a range of different species, buttress morphologies and tree dimensions. Furthermore, the change in stem cross-sectional area with tree height was surprisingly similar and smooth. Despite the small number of trees sampled, the methodological approach used in this study provided new insights on the very irregular geometry of buttressed trees. Our results may help improving the volume and biomass models for buttressed trees, that are crucial contributors to carbon stocks in tropical forests.https://iforest.sisef.org/contents/?id=ifor1449-007BiomassMorphologyVolumeForm Factor |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nölke N Fehrmann L I Nengah Surati J Tiryana T Seidel D Kleinn C |
spellingShingle |
Nölke N Fehrmann L I Nengah Surati J Tiryana T Seidel D Kleinn C On the geometry and allometry of big-buttressed trees - a challenge for forest monitoring: new insights from 3D-modeling with terrestrial laser scanning iForest - Biogeosciences and Forestry Biomass Morphology Volume Form Factor |
author_facet |
Nölke N Fehrmann L I Nengah Surati J Tiryana T Seidel D Kleinn C |
author_sort |
Nölke N |
title |
On the geometry and allometry of big-buttressed trees - a challenge for forest monitoring: new insights from 3D-modeling with terrestrial laser scanning |
title_short |
On the geometry and allometry of big-buttressed trees - a challenge for forest monitoring: new insights from 3D-modeling with terrestrial laser scanning |
title_full |
On the geometry and allometry of big-buttressed trees - a challenge for forest monitoring: new insights from 3D-modeling with terrestrial laser scanning |
title_fullStr |
On the geometry and allometry of big-buttressed trees - a challenge for forest monitoring: new insights from 3D-modeling with terrestrial laser scanning |
title_full_unstemmed |
On the geometry and allometry of big-buttressed trees - a challenge for forest monitoring: new insights from 3D-modeling with terrestrial laser scanning |
title_sort |
on the geometry and allometry of big-buttressed trees - a challenge for forest monitoring: new insights from 3d-modeling with terrestrial laser scanning |
publisher |
Italian Society of Silviculture and Forest Ecology (SISEF) |
series |
iForest - Biogeosciences and Forestry |
issn |
1971-7458 1971-7458 |
publishDate |
2015-10-01 |
description |
In many old-growth natural and close-to-natural forest types, notably in humid tropical forests, a relatively small number of very tall trees contribute considerably to stand basal area and biomass. Such trees often show distinct buttress roots with irregular non-convex shapes. Buttresses are complex structures in the lowest stem section, where most tree biomass is located. The methods used to assess the diameter of buttressed trees have a large impact on the determination of volume and biomass, as well as on the resulting estimates of the aboveground carbon stock in tropical forests. As the measurement of diameter at breast height (DBH at 1.3 m) is not feasible in such conditions, the diameter above buttress (DAB), where the cylindrical bole of the tree begins, is usually measured and included as an independent variable in biomass models. We conducted a methodological study aimed at determining the volume and biomass of individual buttressed trees belonging to several tropical species by the application of terrestrial laser scanning (TLS). The geometry and allometry of the buttresses, as well as the change with height along the stem in buttress volume and cross-sectional area were analyzed. Our results suggest that the relationship between cross-sectional areas at DAB height (ADAB) and the actual tree basal area measured at 1.3 m height is relatively strong (R² = 0.87) across a range of different species, buttress morphologies and tree dimensions. Furthermore, the change in stem cross-sectional area with tree height was surprisingly similar and smooth. Despite the small number of trees sampled, the methodological approach used in this study provided new insights on the very irregular geometry of buttressed trees. Our results may help improving the volume and biomass models for buttressed trees, that are crucial contributors to carbon stocks in tropical forests. |
topic |
Biomass Morphology Volume Form Factor |
url |
https://iforest.sisef.org/contents/?id=ifor1449-007 |
work_keys_str_mv |
AT nolken onthegeometryandallometryofbigbuttressedtreesachallengeforforestmonitoringnewinsightsfrom3dmodelingwithterrestriallaserscanning AT fehrmannl onthegeometryandallometryofbigbuttressedtreesachallengeforforestmonitoringnewinsightsfrom3dmodelingwithterrestriallaserscanning AT inengahsuratij onthegeometryandallometryofbigbuttressedtreesachallengeforforestmonitoringnewinsightsfrom3dmodelingwithterrestriallaserscanning AT tiryanat onthegeometryandallometryofbigbuttressedtreesachallengeforforestmonitoringnewinsightsfrom3dmodelingwithterrestriallaserscanning AT seideld onthegeometryandallometryofbigbuttressedtreesachallengeforforestmonitoringnewinsightsfrom3dmodelingwithterrestriallaserscanning AT kleinnc onthegeometryandallometryofbigbuttressedtreesachallengeforforestmonitoringnewinsightsfrom3dmodelingwithterrestriallaserscanning |
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