Redefinition and global estimation of basal ecosystem respiration rate

Abstract: 

Basal ecosystem respiration rate (BR), the ecosystem respiration rate at a given temperature, is a common and important parameter in empirical models for quantifying ecosystem respiration (ER) globally. Numerous studies have indicated that BR varies in space. However, many empirical ER models still use a global constant BR largely due to the lack of a functional description for BR. In this study, we redefined BR to be ecosystem respiration rate at the mean annual temperature. To test the validity of this concept, we conducted a synthesis analysis using 276 site-years of eddy covariance data, from 79 research sites located at latitudes ranging from ~3°S to ~70°N. Results showed that mean annual ER rate closely matches ER rate at mean annual temperature. Incorporation of site-specific BR into global ER model substantially improved simulated ER compared to an invariant BR at all sites. These results confirm that ER at the mean annual temperature can be considered as BR in empirical models. A strong correlation was found between the mean annual ER and mean annual gross primary production (GPP). Consequently, GPP, which is typically more accurately modeled, can be used to estimate BR. A light use efficiency GPP model (i.e., EC-LUE) was applied to estimate global GPP, BR and ER with input data from MERRA (Modern Era Retrospective-Analysis for Research and Applications) and MODIS (Moderate resolution Imaging Spectroradiometer). The global ER was 103 Pg C yr-1, with the highest respiration rate over tropical forests and the lowest value in dry and high?latitude areas.

Authors
Authors: 
CESCATTI Alessandro, GIELEN Bert, JACOBS Cor, LI Xianglan, MARCOLLA Barbara, DESAI Ankur R., BLACK Andy, BERNHOFER Christian, YUAN Wenping, ZHOU Tao, BAHN Michael, CHEN Jiquan, LUO Yiqi, LIU Shuguang, BOHRER Gil, AURELA Mika, YU Guirui, GRUNWALD T., DUNN Allison, LECLERC Monique Y., STARR Gregory, BELELLI MARCHESINI Luca, IBROM A, MONTAGNANI Leonardo, PITA G., GIANELLE Damiano, LINDROTH Anders, DRAGONI Danilo, STOY P., LIU H., RODEGHIERO Mirco, COOK D. R., RODRIGUES Abel
Publication Year
Publication Year: 
2011
Type

Type:

Appears in Collections
Appears in Collections: 
Institute for Environment and Sustainability
Science Areas
Science Areas: 
JRC Institutes
IES
Publisher
Publisher: 
AMER GEOPHYSICAL UNION
ISSN
ISSN: 
0886-6236
Citation
Citation: 
GLOBAL BIOGEOCHEMICAL CYCLES p. GB4002 no. 4 vol. 25