American chestnut, C. dentata, was a dominant overstorey species in United States forests, but now they have been completely replaced within the ecosystem.
而他们该种在那儿呢?1971年,美国森林科学家们想看看经过太空之旅的种子是否会影响生长。
In 1971, US Forest Service scientists were curious to see whether a journey into space would affect seed growth.
美国森林服务部门报告称,已经在美国港口的坚实木质包装材料中发现了这种树蜂。
The US Forest Service reports it has been detected in solid wood packing material in US ports.
年,火灾相关费用占美国森林服务预算的16%。
In 1995 the budget for fighting fire made up 16 percent of the US Forest Service's budget.
该声明称,迪基已经违反了美国森林管理局有关规定,属于犯罪行为。
According to the statement, Dickey has violated the relevant provisions of the US Forest Service and is a criminal act.
Government land agencies, including the National Park Service, generally followed the fire management policies established by the U.S. Forest Service, which oversees the majority of the nation's forestlands.
The American Forestry Association took up the cause, preparing legislation that would allow the United States president to set aside lands as"forest reservations" through an executive order.
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