Impact of elevated CO2 on a Florida Scrub-oak Ecosystems

doi:10.2172/1061299

GSTDTAP > 地球科学

DOI	10.2172/1061299
报告编号	DOE-SMITHSONIAN INSTITUTION-61993
来源ID	OSTI ID: 1061299
	Impact of elevated CO2 on a Florida Scrub-oak Ecosystems
	Drake, Bert G
	2013
出版年	2013
页数	11
语种	英语
国家	美国
领域	地球科学
英文摘要	Since May of 1996, we have conducted an experiment in Florida Scrub Oak to determine the impact of elevated atmospheric CO2 and climate change on carbon, water, and nutrient cycling in this important terrestrial ecosystem. Florida scrub oak is the name for a collective of species occupying much of the Florida peninsula. The dominant tree species are oaks and the dwarf structure of this community makes it an excellent system in which to test hypotheses regarding the potential capacity of woody ecosystems to assimilate and sequester anthropogenic carbon. Scrub oak is fire dependent with a return cycle of 10-15 years, a time which would permit an experiment to follow the entire cycle. Our site is located on Cape Canaveral at the Kennedy Space Center, Florida. After burning in 1995, we built 16 open top chambers, half of which have been fumigated with pure CO2 sufficient to raise the concentration around the plants to 350 ppm above ambient. In the intervening 10 years we have non destructively measured biomass of shoots and roots, ecosystem gas exchange using chambers and eddy flux, leaf photosynthesis and respiration, soil respiration, and relevant environmental factors such as soil water availability, temperature, light, etc. The overwhelming result from analysis of our extensive data base is that elevated CO2 has had a profound impact on this ecosystem that, overall, has resulted in increased carbon accumulation in plant shoots, roots and litter. Our measurements of net ecosystem gas exchange also indicate that the ecosystem has accumulated carbon much in excess of the increased biomass or soil carbon suggesting a substantial export of carbon through the porous, sandy soil into the water table several meters below the surface. A major discovery is the powerful interaction between the stimulation of growth, photosynthesis, and respiration by elevated CO2 and other environmental factors particularly precipitation and nitrogen. Our measurements focused attention on: stimulation of ecosystem gas exchange by elevated atmospheric CO2; the architecture and distribution of coarse roots using the novel approach of ground penetrating radar; mechanisms for the disturbance of soil carbon pools via the "priming" effect; and how interannual and seasonal variation in precipitation alters the physiological response of key species to elevated CO2. This project was a collaboration between research groups at the Smithsonian Institution, NASA, the Dynamac Corporation, Northern Arizona University, and Old Dominion University in Norfolk, Virginia.
英文关键词	CO2 Ecosystem Gas Exchange Biomass accumulation Soil Carbon Florida Scrub Oak elevated atmospheric CO2 climate change assimilate and sequester anthropogenic carbon ecosystem carbon accumulation in plant shoots roots and litter
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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/6203
专题	地球科学
推荐引用方式 GB/T 7714	Drake, Bert G. Impact of elevated CO2 on a Florida Scrub-oak Ecosystems,2013.