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There is broad consensus that we need a greater understanding of the interaction between trees and urban planting sites. This study was conducted to correlate annual increment growth with different street-tree planting specifications, with a primary emphasis on effective rooting volume of soil. The primary site of analysis was Pennsylvania Avenue in Washington, D. C., with four outlying sites chosen for comparison. From a cohort of 450, a randomly generated sample of 60 Pennsylvania Avenue willow oaks was chosen and increment cores taken at diameter breast height. A total of 60 cores was taken from willow oaks at the comparison sites. The annual incremental growth was measured using a microscope equipped with a computerized stage micrometer. The incremental growth per year in the nursery ranged between 6 and 8 mm and transplant shock generally lasted for 2 to 3 years, until growth regained or exceeded pretransplant levels.

CALIBRATING TREE GROWTH WITH DIFFERENT STREET-TREE PLANTING SPECIFICATIONS: A STUDY OF WASHINGTON, D.C., AREA WILLOW OAKS