Welcome to our interactive
Hubbard Brook forest dynamics program!

This program calculates some basic summaries about forest dynamics at Hubbard Brook, online and on the fly!! The calculations are for the Bird Area, where we have followed the fates of about 6000 uniquely identified trees over 10 hectares with biennial surveys since 1991. Tabular output summarizes the change in health status of individual trees from survey to survey, from which mortality rates can be calculated.

Please do not use any of these numbers in any official way without first checking with the Hubbard Brook research team.

If you are losing the page when reloading images in the calculators, please go back to the W6 front page and reenter by clicking "click here if your browser does not support frames".

This program is optimized for Internet Explorer 6.

Bird Area
(forest dynamics)

Please choose a species:
Please choose a time period:

You may select a diameter range over which you would like to make the summaries. The smallest diameter included in the data is 10 cm and there are no trees over 120 cm dbh. If no diameter range is specified, the program will run for all trees >10 cm dbh.
Enter lower diameter (in cm): 
Enter upper diameter (in cm): 

 

 


Click here for the general overview and details of how all these calculations are being made.

Click here for Tom's very specific miscellaneous notes regarding this calculator.

Click here to access the data used in these calculations.


        Please note that this page may undergo changes in the future as we develop new ideas for calculating forest dynamics. In the meantime, we welcome any suggestions that you may have for this page at thomas.siccama@yale.edu.

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Web page created June 2003
by Thomas Siccama and Ellen Denny