If no biomass equation could be found for an individual species, the average of results from equations of the same genus was used. If no equations for the genus were found, the average of results from all broad leaf or conifer equations was used. Standard errors given for carbon report sampling error rather than error of estimation. Estimation error is unknown and likely larger than the reported sampling error. Estimation error also includes the uncertainty of using biomass equations and conversion factors, which may be large, as well as measurement error, which is typically small.