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Fragmentation of continental United States forests

机译：美国大陆森林的碎片化

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摘要

We report a multiple-scale analysis of forest fragmentation based on 30-m (0,09 ha pixel(-1)) landcover maps for the conterminous United States. Each 0.09-ha unit of forest was classified according to fragmentation indexes measured within the surrounding landscape, for five landscape sizes including 2.25, 7.29, 65.61, 590.49, and 5314.41 ha. Most forest is found in fragmented landscapes. With 65.61-ha landscapes, for example, only 9.9% of all forest was contained in a fully forested landscape, and only 46.9% was in a landscape that was more than 90% forested. Overall, 43.5% of forest was located within 90 In of forest edge and 61.8% of forest was located within 150 In of forest edge. Nevertheless, where forest existed, it was usually dominant-at least 72.9% of all forest was in landscapes that were at least 60% forested for all landscape sizes. Small (less than 7.29 ha) perforations in otherwise continuous forest cover accounted for about half of the fragmentation. These results suggest that forests are connected over large regions, but fragmentation is so pervasive that edge effects potentially influence ecological processes on most forested lands.
机译：我们报告了基于美国本土30米（0.09公顷pixel（-1））土地覆盖图的森林破碎化多尺度分析。根据在周围景观中测得的破碎指数，将每个0.09公顷的森林分类为五个景观尺寸，包括2.25、7.29、65.61、590.49和5314.41公顷。大多数森林都位于零散的景观中。例如，在65.61公顷的景观中，只有9.9％的森林包含在完全森林的景观中，而只有46.9％的森林中有超过90％的森林。总体而言，森林边缘的90 In内有43.5％的森林，森林边缘150 In内有61.8％的森林。不过，在有森林的地方，通常占主导地位-所有森林中至少有72.9％的景观在所有景观尺寸中至少有60％的森林中。否则，连续的森林覆盖中的小孔眼（不到7.29公顷）约占碎片的一半。这些结果表明，森林在大区域之间相连，但是碎片化非常普遍，边缘效应可能影响大多数林地的生态过程。

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