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首页> 美国政府科技报告 >Fire and Forest Structure Across Vegetation Gradients in San Juan National Forest, Colorado: A Multi-scaled Historical Analysis. (Project 01-3-3-13)
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Fire and Forest Structure Across Vegetation Gradients in San Juan National Forest, Colorado: A Multi-scaled Historical Analysis. (Project 01-3-3-13)

机译：科罗拉多州圣胡安国家森林植被梯度的火灾和森林结构：多尺度的历史分析。（项目01-3-3-13）

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We used tree-ring and forest structural data to document fire regimes, forest structure, and relationships between climate change, fires, and tree recruitment across gradients in forest types, elevation, and landscape physiography in the middle Piedra River watershed of San Juan National Forest in southwestern Colorado. Our principle objectives were: 1) to document changes in forest conditions - including species composition, stand densities, and disturbance processes - from pre- to post-Euro-American settlement; and 2) to derive inferences about the top-down (climate and land use changes) and bottom-up (vegetation and landscape physiography) spatiotemporal drivers of fire timing, behavior, and tree demography over the past several centuries. Forest types studied include ponderosa pine, mixed-conifer, aspen, and subalpine forests. Our working hypothesis at the beginning of the study was that changes in forest structure and composition over the recent century of fire exclusion varied largely as a function of fire history, with ponderosa pine and dry mixed-conifer forests that experienced frequent, episodic surface fires having undergone greater changes in fuels and forest structure as a result of fire exclusion than higher-elevation mesic mixed-conifer or subalpine forests that burned less often.

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