Biomass Modelling of Androstachys johnsonii Prain: A Comparison of Three Methods to Enforce Additivity
Joint Authors
Magalhães, Tarquinio Mateus
Seifert, Thomas
Source
International Journal of Forestry Research
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-17, 17 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-04-29
Country of Publication
Egypt
No. of Pages
17
Main Subjects
Abstract EN
Three methods of enforcing additivity of tree component biomass estimates into total tree biomass estimates for Androstachys johnsonii Prain were studied and compared, namely, the conventional (CON) method (a method that consists of using the same independent variables for all tree component models, and for total tree model, and the same weights to enforce additivity), seemingly unrelated regression (SUR) with parameter restriction, and nonlinear seemingly unrelated regression (NSUR) with parameter restriction.
The CON method was found to be statistically superior to any other method of enforcing additivity, yielding excellent fit statistics and unbiased biomass estimates.
The NSUR method ranked second best but was found to be biased.
The SUR method was found to be the worst; it exhibited large bias and had a poor fit for the biomass.
Therefore, we recommend that only the CON and NSUR methods should be used for further estimates, provided that their limitations are considered, that is, exclusion of contemporaneous correlations for the CON method and consideration of the significant bias of the NSUR method.
American Psychological Association (APA)
Magalhães, Tarquinio Mateus& Seifert, Thomas. 2015. Biomass Modelling of Androstachys johnsonii Prain: A Comparison of Three Methods to Enforce Additivity. International Journal of Forestry Research،Vol. 2015, no. 2015, pp.1-17.
https://search.emarefa.net/detail/BIM-1065972
Modern Language Association (MLA)
Magalhães, Tarquinio Mateus& Seifert, Thomas. Biomass Modelling of Androstachys johnsonii Prain: A Comparison of Three Methods to Enforce Additivity. International Journal of Forestry Research No. 2015 (2015), pp.1-17.
https://search.emarefa.net/detail/BIM-1065972
American Medical Association (AMA)
Magalhães, Tarquinio Mateus& Seifert, Thomas. Biomass Modelling of Androstachys johnsonii Prain: A Comparison of Three Methods to Enforce Additivity. International Journal of Forestry Research. 2015. Vol. 2015, no. 2015, pp.1-17.
https://search.emarefa.net/detail/BIM-1065972
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1065972