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In the United States, the forest cover by state and territory is estimated from tree-attributes using the basic statistics reported by the Forest Inventory and Analysis (FIA) program of the Forest Service. [2] Tree volumes and weights are not directly measured in the field, but computed from other variables that can be measured. [3] [4]
It has been estimated that before European settlement, forests in the United States mainland covered nearly 1 billion acres (4,000,000 km 2). [1] Since the mid-1600s, about 300 million acres (1,200,000 km 2 ) of forest have been cleared, primarily for agriculture during the 19th century.
Forest cover in the Eastern United States reached its lowest point in roughly 1872 with about 48 percent compared to the amount of forest cover in 1620. The majority of deforestation took place prior to 1910 with the Forest Service reporting the minimum forestation as 721,000,000 acres (2,920,000 km 2 ) around 1920. [ 2 ]
This is a list of countries and territories of the world according to the total area covered by forests, based on data published by the Food and Agriculture Organization of the United Nations (FAO). In 2010, the world had 3.92 billion hectares (ha) of tree cover, extending over 30% of its land area. [1] [need quotation to verify]
Forest cover is the amount of trees that covers a particular area of land. It may be measured as relative (in percent ) or absolute (in square kilometres / square miles ). Nearly a third of the world's land surface is covered with forest, with closed-canopy forest accounting for 4 - 5 billion hectares of land. [ 1 ]
Name A Photo Location [6] B Date formed [4] C Area [1] Description D; Allegheny: Pennsylvania: September 24, 1923: 513,655 acres (2,078.7 km 2) : Pennsylvania's only national forest includes Kinzua Dam and Allegheny Reservoir on the Allegheny Plateau in the northwestern part of the state.
In Australia, compensatory afforestation has been strict since before the adoption of the policy, there was massive destruction of forests which covered as much as 30% of natural forests. [19] Ultimately, compensatory afforestation policies have evolved to better reforms over the years to become valuable contributors to the development of new ...
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