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。
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