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Full-Text Articles in Life Sciences
Natural Tree Reproduction In Urban Environments, John Boyd, Forest Stearns
Natural Tree Reproduction In Urban Environments, John Boyd, Forest Stearns
Field Station Bulletins
Three contrasting urban areas in Milwaukee County were sampled to determine the tree species reproducing and the habitats in which seedlings become established. Habitats most favorable for seedling establishment were shrub hedges and areas along fence lines or adjacent to buildings. Overall, elm and ash were the taxa most successful in establishing seedlings. In the Menomonee Valley, seedlings of boxelder and tree-of-heaven were most abundant with elm and ash close behind, while in Shorewood and Brown Deer, a great variety of seedlings was present. Elm, ash, boxelder, Norway maple, buckthorn, cherry and mountain ash were the most prevalent. Successful seedling …
Leachable Phosphorus Levels Of Urban Street Trees: Contributions To Urban Runoff, John R. Dorney
Leachable Phosphorus Levels Of Urban Street Trees: Contributions To Urban Runoff, John R. Dorney
Field Station Bulletins
Intelligent environmental management of urban areas depends upon a thorough understanding of urban ecosystem properties, such as structure, energy flow and materials cycles. This report examines the phosphorous cycle in urban runoff - a portion of the urban phosphorous cycle - which is involved in diffuse (non-point) source pollution from urban areas. The goals of my research were to determine if street tree leaves and seeds are a source of phosphorous in urban runoff and if so, how these levels varied between tree species.
Salt And Milwaukee Street Trees, Susan Van Wyck, Forest Stearns
Salt And Milwaukee Street Trees, Susan Van Wyck, Forest Stearns
Field Station Bulletins
Many trees are not well-adapted to the rigors of urban life. Some are highly susceptible to the effects of S02. Others, such as the oaks, grow too slowly while cottonwood and horse chestnut for example, good city trees, in most respects, produce quantities of fruit or seeds considered a nuisance by many residents. Trees best adapted to urban life appear to be those native to floodplains such as elm, ash, silver maple and sycamore. These species evolved to survive spring floods, summer droughts and therefore are better suited to the poorly aerated city soils. Since the rapid demise of elms …