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Trees in the Life of a City
Street Tree Survival in a Concrete Environment
City Street Trees Need Your Help
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air pollution bacteria block branches breathe Calcium chloride Call the parks carbon dioxide cars cavity City Parks city street trees city trees color concrete cool damaged bark dead decay decide which tree dissolved enter the tree evaporate garbage garden supply store ginkgo tree girdling HARM THE TREE help protect helps trees hole humus injured Insects and disease kinds of trees leaves litter London Plane melt snow Mulch helps nature's air-conditioners need a lot nitrogen overhead wires oxygen packed soil pail paint parks department phloem phosphorus photosynthesis plant a tree plant the tree planted street poor soil potassium Pruning a tree Remember salt scar tissue sidewalks soil around street spread sucker growths sunlight support the tree tells the percentage tiny tree census tree guard tree pit tree roots absorb tree trunk trees are planted Trees help TREES NEED PROTECTION twigs winter wood chips wound York York City young trees