Biomass Regression for Liquidambar styraciflua


Jason Fults

Growth response of Liquidambar styraciflua (Sweetgum) trees to elevated CO2 on the ORNL Free-Air CO2 Enrichment (FACE) facility is quantified by monthly measurements of tree diameter. These measurements are used to estimate total biomass production via mathematically-expressed allometric relationships. These relationships were established by harvesting several non-experimental trees, measuring various aspects of them, and combining this data with measurements taken some years ago from younger trees on the same plot. Ten trees were harvested, stripped of their leaves, and measured in separate components: the bole, primary and secondary branches, leaves, stump, and roots. Fresh-to-dry ratios were derived from subsamples of each section to determine the total above-ground dry mass of each tree. This information was plotted against the basal area of each tree, arriving at a relationship between the diameter and biomass similar to that documented earlier. This extended data set will be used in future research on the FACE site.

Presentation: Biomass Regression for Liquidambar styraciflua


The Global Change Education Program is funded by the
U.S. Department of Energy

Office of Biological and Environmental Research