HR: 0800h
AN: B51A-0040    [Abstracts]
TI: Phenology of Net Ecosystem Exchange: A Simple Estimation Method
AU: * Losleben, M V
EM: losleben@email.arizona.edu
AF: National Phenology Network, 1955 E. Sixth St., Rm 101, Tucson, AZ 85719, United States
AB: Carbon sequestration is important to global carbon budget and ecosystem function and dynamics research. Direct measurement of Net Ecosystem Exchange (NEE), a measure of the carbon sequestration of an ecosystem, is instrument, labor, and fiscally intensive, thus there is value to establish a simple, robust estimation method. Six ecosystem types across the United States, ranging from deciduous and coniferous forests to desert shrub land and grasslands, are compared. Initial results suggest instrumentally measured NEE and this proxy method are promising, showing excellent temporal matches of the two methods for onset and termination of carbon sequestration in a sub-alpine forest for the study period, 1997-2006. Moreover, the similarity of climatic signatures in all six ecosystems of this study suggests this proxy estimation method may be widely applicable across diverse environmental zones This estimation method is simply the interpretation of annual accumulated daily precipitation plotted against the annual daily accumulated degree growing days above a zero degree C base. Applicability at sub-seasonal time scales will also be discussed in this presentation.
DE: 0428 Carbon cycling (4806)
DE: 0429 Climate dynamics (1620)
DE: 0430 Computational methods and data processing
DE: 0434 Data sets
DE: 0439 Ecosystems, structure and dynamics (4815)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting