Quantifying Uncertainty in Ecosystem Studies

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10/06/2015 5:44 pm  #1


Uncertainty between trees with different diametric classes

Hello everyone!!
 
Maybe someone can give me a clue!!
I am working in order to obtain the biomass and uncertainty of a forest inventory in Peru.  The plots has not the same area for the bigger trees (dbh>= 30) and the smallest (dbh <30cm).  Actually I create my function to obtain the biomass and uncertainty. But now I would like to sum both values the big and small trees. but I am not sure its going to be ok, to sum just as a simple way. I imagine I must weight the values, in order to do not make an statistical error.  That any one can give and avise how i must weight de values, could i do it by basal area or number of trees by plot? I would appreciate it any comment!!
 
Best regards

 

3/13/2016 11:23 pm  #2


Re: Uncertainty between trees with different diametric classes

If you calculate the biomass and uncertainty per unit area (you divide by the area measured), then you should be able to sum the two classes.  Am I missing something?

 

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