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Fig. 6. Profile of Pb in tree rings of baldcypress along Transects 1 and 2 running perpendicular to Bayou Trepagnier into the adjacent cypress-tupelo community, and Stinking Bayou, a bayou that empties into Lake Pontchartrain 35 km north of Bayou Trepagnier. Error bars indicate standard error. The level of Pb in trees along Stinking Bayou, the reference area, was significantly different from the levels in trees along the two transects (see Table 2). The detection limit is 1 mg/kg.
