Reducing Uncertainty in the Use of Allometric Biomass Equations for Predicting Above-Ground Tree Biomass in Mixed Secondary Forests.

TitleReducing Uncertainty in the Use of Allometric Biomass Equations for Predicting Above-Ground Tree Biomass in Mixed Secondary Forests.
Publication TypeJournal Article
Year of Publication2001
AuthorsKetterings Q, Coe R, van Noordwijk M, Ambagau Y, Palm C
ContactAuthorasb@cgiar.org, qmk2@cornell.edu
JournalForest Ecology and Management
Volume146
Issue1-3
Start Page199
Pagination199-209
Date PublishedJune 2001
ISSN0378-1127
KeywordsAbove-ground biomass, allometric biomass equation, breast height diameter, Carbon stocks, secondary forest, wood density
AbstractEstimates of forest biomass are needed for tracking changes in C stocks, as well as for other purposes. A common method for estimating forest biomass is through use of allometric equations which relate the biomass of individual trees to easily obtainable non-destructive measurements, such as diameter. A common form is B=aDb for biomass B, diameter D and parameters a and b. Field data collected in Sumatra and compared with previously published data show that the values of a and b vary between sites. This variation is likely to be the major source of uncertainty if biomass estimates are produced using equations that are not calibrated for individual sites. However, calibration by collection of B and D data for each site is unrealistic, requiring destructive measures. Methods of choosing values for a and b are, therefore, proposed that do not require destructive measurements. The parameter b can be estimated from the site-specific relationship between height (H) and diameter, H=kDc as b=2+c. The parameter a can be estimated from the average wood density (ρ) at the site as a=rρ, where r is expected to be relatively stable across sites. The allometric equation proposed is therefore B=rρD2+c.
URLhttp://www.sciencedirect.com/science/article/pii/S0378112700004606
DOI10.1016/S0378-1127(00)00460-6