U.S. lumber production peaked at 40.5 billion board feet in 2005 and plunged to 23.4 billion in 2009, according to Western Wood Products Association and Southern Forest Products Association estimates.
据美国西部木材产品协会和南方森林产品协会的统计，2005年，美国木材生产创下405亿板英尺的最高产量，到2009年骤减到234亿板英尺。
Additionally, spatial association index was computed to characterize the spatial interactions between forest class and other target land use types of interest.
另外，计算景观类型间的空间关联指数，以刻画森林与其他土地利用类型的空间交互效应。
Forest vegetation was classified into 3 vegetation type groups, 9 vegetation types, 41 association.
森林植被可划分为3个植被型组，9个植被型，41个群系。
The Alliance for Environmental Technology (AET) is an association of chemical manufacturers and forest product companies in North America.
环境技术联盟(AET)是由北美的化学制造商和森林产品公司组成的联盟。
The Alliance for Environmental Technology (AET) is an association of chemical manufacturers and forest product companies in North America.
环境技术联盟(AET)是由北美的化学制造商和森林产品公司组成的联盟。
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