A nonparametric method for separating photosynthesis and respiration components in CO2 flux measurements
Article first published online: 4 SEP 2004
Copyright 2004 by the American Geophysical Union.
Geophysical Research Letters
Volume 31, Issue 17, September 2004
How to Cite
2004), A nonparametric method for separating photosynthesis and respiration components in CO2 flux measurements, Geophys. Res. Lett., 31, L17107, doi:10.1029/2004GL020490., et al. (
- Issue published online: 4 SEP 2004
- Article first published online: 4 SEP 2004
- Manuscript Accepted: 9 AUG 2004
- Manuscript Revised: 23 JUL 2004
- Manuscript Received: 10 MAY 2004
 Future climate change is expected to affect ecosystem-atmosphere CO2 exchange, particularly through the influence of temperature. To date, however, few studies have shown that differences in the response of net ecosystem CO2 exchange (NEE) to temperature among ecosystems can be explained by differences in the photosynthetic and respiratory processes that compose NEE. Using a new nonparametric statistical model, we analyzed data from four forest ecosystems. We observed that differences among forests in their ability to assimilate CO2 as a function of temperature were attributable to consistent differences in the temperature dependence of photosynthesis and respiration. This observation provides empirical validation of efforts to develop models of NEE from the first-principle relationships between photosynthetic and respiratory processes and climate. Our results also showed that models of seasonal dynamics in NEE that lack specific consideration of the temperature dependence of respiration and photosynthesis are likely to carry significant uncertainties.