Biomaterial Database

Isoprene emission from terrestrial ecosystems in response to global change: minding the gap between models and observations. 2007

Russell K Monson, and Nicole Trahan, and Todd N Rosenstiel, and Patrick Veres, and David Moore, and Michael Wilkinson, and Richard J Norby, and Astrid Volder, and Mark G Tjoelker, and David D Briske, and David F Karnosky, and Ray Fall

Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309, USA. russell.monson@colorado.edu

Coupled surface-atmosphere models are being used with increased frequency to make predictions of tropospheric chemistry on a 'future' earth characterized by a warmer climate and elevated atmospheric CO2 concentration. One of the key inputs to these models is the emission of isoprene from forest ecosystems. Most models in current use rely on a scheme by which global change is coupled to changes in terrestrial net primary productivity (NPP) which, in turn, is coupled to changes in the magnitude of isoprene emissions. In this study, we conducted measurements of isoprene emissions at three prominent global change experiments in the United States. Our results showed that growth in an atmosphere of elevated CO2 inhibited the emission of isoprene at levels that completely compensate for possible increases in emission due to increases in aboveground NPP. Exposure to a prolonged drought caused leaves to increase their isoprene emissions despite reductions in photosynthesis, and presumably NPP. Thus, the current generation of models intended to predict the response of isoprene emission to future global change probably contain large errors. A framework is offered as a foundation for constructing new isoprene emission models based on the responses of leaf biochemistry to future climate change and elevated atmospheric CO2 concentrations.

UI	MeSH Term	Description	Entries
D008962	Models, Theoretical	Theoretical representations that simulate the behavior or activity of systems, processes, or phenomena. They include the use of mathematical equations, computers, and other electronic equipment.	Experimental Model,Experimental Models,Mathematical Model,Model, Experimental,Models (Theoretical),Models, Experimental,Models, Theoretic,Theoretical Study,Mathematical Models,Model (Theoretical),Model, Mathematical,Model, Theoretical,Models, Mathematical,Studies, Theoretical,Study, Theoretical,Theoretical Model,Theoretical Models,Theoretical Studies
D010420	Pentanes	Five-carbon saturated hydrocarbon group of the methane series. Include isomers and derivatives.	Isopentanes
D002070	Butadienes	Four carbon unsaturated hydrocarbons containing two double bonds.	Butadiene Derivative,Butadiene Derivatives,Derivative, Butadiene,Derivatives, Butadiene
D001272	Atmosphere	The gaseous envelope surrounding a planet or similar body. (From Random House Unabridged Dictionary, 2d ed)	Atmospheres
D014197	Trees	Woody, usually tall, perennial higher plants (Angiosperms, Gymnosperms, and some Pterophyta) having usually a main stem and numerous branches.	Tree
D014481	United States	A country in NORTH AMERICA between CANADA and MEXICO.
D017752	Greenhouse Effect	The effect of GREENHOUSE GASES and the resulting increase in world temperatures. The predicted health effects of such long-term climatic change include increased incidence of respiratory, water-borne, and vector-borne diseases.	Effect, Greenhouse
D017753	Ecosystem	A functional system which includes the organisms of a natural community together with their environment. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed)	Ecosystems,Biome,Ecologic System,Ecologic Systems,Ecological System,Habitat,Niche, Ecological,System, Ecological,Systems, Ecological,Biomes,Ecological Niche,Ecological Systems,Habitats,System, Ecologic,Systems, Ecologic
D045782	Hemiterpenes	Compounds that include a single 2-methyl-1,3-butadiene (also known as isoprene) within their structure.	Hemiterpene,Hemiterpenoid,Hemiterpenoids