Nitrogen Isotopic Composition and Elemental Concentration of Tree-rings May Help Map the Extent of Historic Fire Events

Elemental and nitrogen isotopic compositions of tree-rings adjacent to a fire-scar in a white birch (Betula papyrifera) are compared to those away from the scar in the same tree, and to those of nearby non-scarred yellow birches (Betula alleghaniensis) and white birches. The δ15N value at the fire-scar was 1.5 [per thousand] lower than non-fire-scarred trees and had elevated Ba, Ca, Mg, Sr, and Mn concentrations relative to elsewhere around the bole and to non-scarred trees. Variations in tree-ring chemistry may be useful in mapping the extent and assessing the magnitude of historic fire events.