| DOI: | 10.2172/1088865
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| 报告号: | ER46506-1
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| 报告题名: | Linking ecosystem scale vegetation change to shifts in carbon and water cycling: the consequences of widespread piĂąon mortality in the Southwest |
| 作者: | Litvak, Marcy Ellen [University of New Mexico]
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| 出版年: | 2012
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| 发表日期: | 2012-10-01
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | carbon cycle dynamics
; Southwestern U.S.
; coniferous tree mortality
; biogeochemical cycling
; disturbance
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| 中文主题词: | 碳
; 干旱
; 植被
; 死亡率
; 生物化学过程
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| 主题词: | CARBON
; DROUGHT
; VEGETATION
; MORTALITY
; BIOGEOCHEMICAL PROCESSES
|
| 英文摘要: | The southwestern United States experienced an extended drought from 1999-2002 which led to widespread coniferous tree mortality. PiĂąon-juniper (PJ) woodlands, which occupy 24 million ha throughout the Southwest, were extremely vulnerable to this drought. An abrupt die-off of 40 to 95% of piĂąon pine (Pinus edulis) and 2-25% of juniper (Juniperus monosperma) across 1.5 million ha triggered rapid and extensive changes in the structure of PJ woodlands with potentially large, yet unknown, consequences for ecosystem services and feedbacks between the carbon cycle and climate system. Given the spatial extent of PJ woodlands (3rd largest biome in the US) and climatic predictions of increased frequency and intensity of drought in the region, it is crucial to understand the consequences of these disturbances on regional carbon and energy dynamics, biogeochemical processes and atmospheric CO2. The overall objective of our research was to quantify what impact widespread mortality of piĂąon trees has for carbon and water cycling in PJ woodlands. Our specific objectives for this proposal were: 1) Quantify the carbon, water and energy exchange trajectory after mortality in PJ woodlands; 2) Determine the mechanisms controlling the response and recovery of ecosystem production and respiration processes following large-scale piĂąon mortality; 3) Use the relationships we measure between ecosystem structure and function PJ woodlands recover from mortality to scale the results of our study up to the regional scale. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1088865
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/40508
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1088865.doc（2697KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Litvak, Marcy Ellen [University of New Mexico]. Linking ecosystem scale vegetation change to shifts in carbon and water cycling: the consequences of widespread piĂąon mortality in the Southwest. 2012-01-01.
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