Dissertation Research: Ecological Effects of Temporal and Spatial Variability in the Disturbance Regime of an Old-growth Ponderosa Pine Forest

论文研究：老黄松林干扰状况时空变化的生态效应

• 批准号: 0105155
• 负责人: Thomas Swetnam
• 金额: $ 0.51万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0105155&HistoricalAwards=false
• 关键词: Dissertation; Research; Ecological; Effects; Temporal

Proposal: DEB-0105155PI: Swetnam, Thomas W., and Donald A. FalkTitle: Dissertation Research: Ecological Effects of Temporal and Spatial Variability in the Disturbance Regime of an Old-growth Ponderosa Pine ForestAlthough southwestern forests historically have been subjected to a disturbance regime that includes frequent fires, many tree species are sensitive to fire, especially during juvenile states of development. Paradoxically, fires occurring at mean intervals should exclude even dominant species such as Ponderosa Pine. This suggests that extended intervals without fire are required for the establishment of Ponderosa pine and other fire-sensitive species. Within this context, the proposed research addresses central issues in disturbance ecology with important implications to forestry and resource management. The effects of temporal variation in fire-return intervals are investigated with respect to the demography of dominant and sub-dominant species of tree, as this can have a significant impact on forest diversity. In addition, mathematical models are developed which consider the likelihood of fires occurring within a specified area. This provides quantitative insights concerning the scaling of effects for disturbance.

题目：论文研究：原始黄松森林扰动机制时空变异的生态效应尽管西南森林历史上一直受到包括频繁火灾在内的扰动机制的影响，但许多树种对火灾很敏感，特别是在幼年发育阶段。矛盾的是，平均间隔发生的火灾甚至应该排除优势物种，如黄松。这表明黄松和其他对火敏感的树种需要较长的无火间隔期。在此背景下，提出的研究解决了干扰生态学的核心问题，对林业和资源管理具有重要意义。本文从优势和次优势树种的人口统计学角度研究了还火间隔时间变化的影响，因为这对森林多样性有重要影响。此外，还开发了数学模型，考虑在特定区域内发生火灾的可能性。这为扰动效应的尺度提供了定量的见解。