Linking ecosystem scale vegetation change to shifts in carbon and water cycling: the consequences of widespread piĂąon mortality in the Southwest

doi:10.2172/1088865

GSTDTAP > 地球科学

DOI	10.2172/1088865
报告编号	ER46506-1
来源ID	OSTI ID: 1088865
	Linking ecosystem scale vegetation change to shifts in carbon and water cycling: the consequences of widespread piĂąon mortality in the Southwest
	Litvak, Marcy Ellen [University of New Mexico]
	2012-10-01
出版年	2012
语种	英语
国家	美国
领域	地球科学
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.
英文关键词	carbon cycle dynamics Southwestern U.S. coniferous tree mortality biogeochemical cycling disturbance
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/5768
专题	地球科学
推荐引用方式 GB/T 7714	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.