Daniel E. Crane

Carbon storage and sequestration by urban trees in the USA.

Based on field data from 10 USA cities and national urban tree cover data, it is estimated that urban trees in the coterminous USA currently store 700 million tonnes of carbon (

Potential effect of Anoplophora glabripennis (Coleoptera: Cerambycidae) on urban trees in the United States

14,300 million value) with a gross carbon sequestration rate of 22.8 million tC/yr (

Tree mortality rates and tree population projections in Baltimore, Maryland, USA

460 million/year). Carbon storage within cities ranges from 1.2 million tC in New York, NY, to 19,300 tC in Jersey City, NJ. Regions with the greatest proportion of urban land are the Northeast (8.5%) and the southeast (7.1%). Urban forests in the north central, northeast, south central and southeast regions of the USA store and sequester the most carbon, with average carbon storage per hectare greatest in southeast, north central, northeast and Pacific northwest regions, respectively. The national average urban forest carbon storage density is 25.1 tC/ha, compared with 53.5 tC/ha in forest stands. These data can be used to help assess the actual and potential role of urban forests in reducing atmospheric carbon dioxide, a dominant greenhouse gas.

Brooklyn's urban forest

Abstract Anoplophora glabripennis Motschulsky, a wood borer native to Asia, was recently found in New York City and Chicago. In an attempt to eradicate these beetle populations, thousands of infested city trees have been removed. Field data from nine U.S. cities and national tree cover data were used to estimate the potential effects of A. glabripennis on urban resources through time. For the cities analyzed, the potential tree resources at risk to A. glabripennis attack based on host preferences, ranges from 12 to 61% of the city tree population, with an estimated value of

Modeling the Effects of Urban Vegetation on Air Pollution

72 million–

Assessing urban forest effects and values, New York City's urban forest

2.3 billion per city. The corresponding canopy cover loss that would occur if all preferred host trees were killed ranges from 13–68%. The estimated maximum potential national urban impact of A. glabripennis is a loss of 34.9% of total canopy cover, 30.3% tree mortality (1.2 billion trees) and value loss of

Assessing urban forest effects and values, Minneapolis' urban forest

669 billion.

Assessing urban forest effects and values, Chicago's urban forest

Based on re-measurements (1999 and 2001) of randomly-distributed permanent plots within the city boundaries of Baltimore, Maryland, trees are estimated to have an annual mortality rate of 6.6% with an overall annual net change in the number of live trees of -4.2%. Tree mortality rates were significantly different based on tree size, condition, species, and Land use. Morus alba, Ailanthus altissima, and trees in small diameter classes, poor condition, or in transportation or commercial - industrial land uses exhibited relatively high mortality rates. Trees in medium- to low-density residential areas exhibited low mortality rates. The high mortality rate for A. altissima is an artifact of this species distribution among land use types (24% were in the transportation land use). Based on a new tree population projection model that incorporates Baltimores existing tree population and annual mortality estimates, along with estimates of annual tree growth, Baltimores urban forest is projected to decline in both number of trees and canopy area over the next century. Factors affecting urban tree mortality are discussed.

Assessing urban forest effects and values, Washington, D.C.'s urban forest

An assessment of trees in Brooklyn, New York, reveal that this borough has approximately 610,000 trees with canopies that cover 11.4 percent of the area. The most common trees are estimated to be tree of heaven, white mulberry, black locust, Norway maple and black cherry. Brooklyns trees currently store approximately 172,000 metric tons of carbon with an estimated value of

Assessing urban forest effects and values, San Francisco's urban forest

3.5 million. In addition, these trees remove about 2,500 tC per year (