Iowa, U.S., communities benefit from a tree-planting program: characteristics of recently planted trees

Reports on a study of a tree-planting program in 350 Iowa communities. Species diversity, survival, size, growth, carbon uptake, and pollution removal were assessed for 932 trees in 21 communities. [UMN]

"Since 1990, externally funded tree-planting activities have taken place in more than 350 Iowa, U.S., communities. The species diversity, survival, size, growth, carbon uptake, carbon storage, and pollution removal of 932 trees planted in 21 communities of different sizes and in different parts of Iowa were assessed by repeated measurements over a 4-year period. The sample included 40 taxa and was dominated by crabapples (Malus spp.) and green ash (Fraxinus pennsylvanica Marsh.). Species diversity was described using the reciprocal of Simpsons index for the overall population (10.92), by community size, and by location in the state. No differences in species diversity were detected according to community size or location in the state. Overall survival rate for the trees was 91%; no significant differences in survival rate related to community size or location were detected. Estimated carbon stored by all trees was 2,252 kg (4,954 lb), and carbon uptake was estimated to be 568 kg/yr (1,250 lb). Total pollution removal by all trees was estimated at 2 kg/yr (4.4 lb)." [Abstract]