I need to compare models for predicting DBH and Height from stump diameter at 30 cm. I am looking for allometric models for tropical and subtropical tree species. my objective is to predict stem/bole biomass from stump diameter at 30 cm. I have species wise allometric equations for volume and biomass for a particular region and these equations are based on DBH and Height, but not the stump dia.
And is there any alternative way to reach my objectives.
I need suggestions...
Since you're ultimate goal is to develop an allometric equation that predicts stem biomass (above ground) from stump diameter, you should first calculate volume from DBH and Height. Then calculate stem biomass of trees from volume and species-specific wood density. If you have enough stump dia and stem biomass information, you can easily develop an allometric equation as:
Stem Biomass ~ f(Stump Diameter)
Depending on your data, you can try fitting different linear/ non-linear models and choose the best fit model based on R2/AIC values.
Hope this helps.
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