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Manual for tree allometric equations
Nicolas Picard, Laurent Saint-André, Matieu Henry
To cite this version:
Nicolas Picard, Laurent Saint-André, Matieu Henry. Manual for tree allometric equations. Expert meeting on tree volume, biomass allometric equations and biomass expansion factors, UN-Reducing Emissions from Deforestation and forest Degradation (UN-REDD). Genève, CHE.; Food and Agricul-ture Organization (FAO). ITA., Jun 2012, Hanoi, Vietnam. 11 p. �hal-02804741�
Expert meeting on tree
volume, biomass
allometric equations and
biomass expansion
factors
•
Manual for tree allometric
equations
•
Authors : N. Picard (CIRAD),
L. Saint-André (CIRAD -
INRA), and M. Henry (FAO)
From the idea
….(born in 2005)
Students are not familiar with the appropriate and up-to-date fitting
techniques
û
the “magic” R2 is usually preferred to the biological meaning of the
equations
û
Models are fitted without considering the structure in the data set
(source of variations)
û
And so on ….
There was a strong need to make a new
review on tree allometric equations
Including biological concepts, up-to-date
statistical procedures and training examples
Outliers are too easily removed from the data set while they can
bring information on the structure of the dataset
……To the result
(2012)
Picard N., Saint-André L., Henry M.
2012. Manuel de construction
d’équations allométriques pour
l’estimation du volume et la biomasse
des arbres: de la mesure de terrain à
la prédiction. Organisation des
Nations Unies pour l’alimentation et
’agriculture, et Centre de Coopération
Internationale en Recherche
Agronomique pour le Développement,
Rome, Montpellier, 222 pp.
Content
1 Tree growth, biomass partitioning and biomass allocation - Biological concepts
2 Sampling strategy and stratification
3 Field work
4 Data recording and checking
5 Data analysis and graphical exploration of the structure in the data sets
6 Model fitting
1 Tree growth, biomass partitioning and biomass
allocation - Biological concepts
Tree and stand growth: case of even-aged and monospecific forests
-
Wood production
(volume) of a given tree
species at a given stand
mean (or top) height
should be identical for
all site classes.
- Soil fertility (site index)
determines the time
need to attain this height
and volume.
-
A- Stand production
-
Eichhorn’s rule
-
Assmann’s yield
level theory
-
There are some range of variations of
wood production at a given top height
(variations related to the stockability issue)
-
Langsaeter
Hypothesis
-
Losses in productivity if
the standing stock is too
low
3 Field work
Above-ground biomasses
û
Sampling of cross-sections regularly along the trunk. The width of the cross-sections should be fixed for all heights within the trees For multi-stem trees, take cross-sections in all stems
Stump:
Top limit = above-ground point where the
tree was cut
Down limit = where the roots could be clearly individualized
Mixing leaves before taking a sample
