HR: 08:45h
AN: B31E-04 [Abstracts]
TI: Latitudinal Patterns of Interannual Variability in Net Ecosystem Exchange
AU: * Yuan, W
EM: wenping yuan
AU: Luo and FluxNet coauthors, Y
EM: yluo@ou.edu
AF: University of Oklahoma, Department of Botany and Microbiology
770 Van Vleet Oval, Norman, OK 73019, United States
AB:
Interannual variability (IAV) in net ecosystem exchange of carbon (NEE) is a common phenomenon observed at
almost all eddy covariance flux site worldwide. However, our understanding of the spatial patterns of IAV is
extremely limited. In this study, we examined latitudinal patterns of IAV in NEE based on 207 years of data at 55
eddy flux sites consisting located from 3.02o south hemisphere to of 56.62o north hemisphere. . We computed
standard deviation (STD) of yearly mean values of NEE at individual sites to represent the absolute IAV (AIAV) and
coefficient of variation (CV) for relative IAV (RIAV). Our results showed that AIAV significantly decreased with
latitude in mixed forests of deciduous broadleaf and evergreen needleleaf forest (MIX) and grasslands (GRS)
(P<0.06). RIAV significantly increased with latitude in in deciduous broadleaf forests (DBF) (P<0.06) but
decreased in GRS (P=0.06) and croplands (CRP) (P<0.06). The spatial patterns of IAV in NEE need to be further
improved once more years of NEE data become available.
UR: http://bomi.ou.edu/luo
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0428 Carbon cycling (4806)
DE: 0430 Computational methods and data processing
DE: 0438 Diel, seasonal, and annual cycles (4227)
DE: 0439 Ecosystems, structure and dynamics (4815)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting