| 项目编号: | 1600716
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| 项目名称: | DISSERTATION RESEARCH: Origins of alternate ecosystem states - effects of drought on postfire tree regeneration and shifting dominance of western conifers |
| 作者: | Monica Turner
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| 承担单位: | University of Wisconsin-Madison
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| 批准年: | 2016
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| 开始日期: | 2016-06-01
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| 结束日期: | 2017-05-31
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| 资助金额: | 19890
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Biological Sciences - Environmental Biology
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| 英文关键词: | research
; drought
; tree-seedling
; forest
; widespread rocky mountain tree species
; tree species
; postfire tree-seedling establishment
; alternate dominant tree species
; doctoral dissertation research
; 21st century drought
; many tree species
; tree seedling
; drought condition
; widespread western conifer
; postfire regeneration
; western united states
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| 英文摘要: | This doctoral dissertation research seeks to understand how drought following wildfires affects the establishment of two widespread Rocky Mountain tree species, lodgepole pine and Douglas-fir. In Yellowstone National Park, warming, drying conditions are leading to increased frequency of severe wildfires that kill existing trees and trigger regrowth of the forest. These trends are expected to continue. Many tree species in Yellowstone are well adapted to fire. Yet, early and abundant seedling establishment after fire is critical for forests to recover. Tree seedlings are particularly sensitive to drought, and evidence suggests that sufficiently dry postfire conditions could cause the widespread death of tree-seedlings, with consequences that may last decades. This research will determine how seedlings from two tree species respond to drought conditions expected in the mid-21st century and will identify the mechanisms that influence seedling response to dry conditions. The results of this study will advance understanding of how forests in the western United States will respond to environmental change over the coming decades and provide useful information for western land managers who are grappling with increased wildfires. In addition to providing important scientific knowledge, the study will provide opportunities for undergraduate students to experience research in the field of forest ecology. Researchers will also engage local residents of the Greater Yellowstone area by presenting an exhibit of science art in local shops that features photographs of the research. A handout will accompany the exhibit that presents the study findings to residents, such as how changing forests may influence recreational opportunities.
This research will address the questions: How will 21st century drought alter postfire regeneration of a widespread western conifer? Will future climate conditions favor an alternate dominant tree species of non-forest cover? A greenhouse experiment will be conducted, where a combination of projected growing season daily temperature and soil-moisture conditions will be simulated to determine how expected drought will influence rates of postfire tree-seedling establishment in different soil types. The experiment will be conducted in a unique facility at the University of Wisconsin-Madison in which environmental conditions can be controlled at sub-daily resolutions, and the work will complement an ongoing field-based experiment in Yellowstone. Results will be integrated into process-based models to explore consequences of drought and increased fire activity at landscape and regional scales. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/92234
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Monica Turner. DISSERTATION RESEARCH: Origins of alternate ecosystem states - effects of drought on postfire tree regeneration and shifting dominance of western conifers. 2016-01-01.
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