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Menu: Edit | Combine relevés

 

Using this option you can combine different relevés into a new one. Species that occur in more than one relevé are summed up using the following formula:

 

 C = A + (100 – A) * B / 100

 

where C = summed cover in percentages, A = cover in percentages of a species in relevé A and B = the cover in percentages of the same species in relevé B. We assume that the species have a random distribution in the plot.

The cover of each species is multiplied with the quotient of the size of the plot in which the species exists divided by total size of all plots.  

 

Preserve layer differentiation: indicate whether species that occur in different vegetation layers (strata)  should be combined.

 

For a slightly more sophisticated way of summing up relevés consider using the option Combine subplots into plots.