Journal
NEW PHYTOLOGIST
Volume 196, Issue 2, Pages 472-488Publisher
WILEY
DOI: 10.1111/j.1469-8137.2012.04269.x
Keywords
climate feedback; CO 2; dynamic global vegetation model; greenhouse gas; nitrogen cycle; nitrous oxide (N2O)
Categories
Funding
- National Natural Science Foundation of China [40975096, 40871032, 41175128]
- Strategic Priority Research Program-Climate Change: Carbon Budget and Related Issues of the Chinese Academy of Sciences [XDA05020402, XDA05050404-3-2]
- UK Natural Environment Research Council under the QUEST (Quantifying and Understanding the Earth System) core team contract
- Oeschger Centre for Climate Change Research
- Swiss National Science Foundation
Ask authors/readers for more resources
Ecosystem nitrous oxide (N2O) emissions respond to changes in climate and CO2 concentration as well as anthropogenic nitrogen (N) enhancements. Here, we aimed to quantify the responses of natural ecosystem N2O emissions to multiple environmental drivers using a process-based global vegetation model (DyN-LPJ). We checked that modelled annual N2O emissions from nonagricultural ecosystems could reproduce field measurements worldwide, and experimentally observed responses to step changes in environmental factors. We then simulated global N2O emissions throughout the 20th century and analysed the effects of environmental changes. The model reproduced well the global pattern of N2O emissions and the observed responses of N cycle components to changes in environmental factors. Simulated 20th century global decadal-average soil emissions were c. 8.29.5 Tg N yr-1 (or 8.310.3 Tg N yr-1 with N deposition). Warming and N deposition contributed 0.85 +/- 0.41 and 0.80 +/- 0.14 Tg N yr-1, respectively, to an overall upward trend. Rising CO2 also contributed, in part, through a positive interaction with warming. The modelled temperature dependence of N2O emission (c. 1 Tg N yr-1 K-1) implies a positive climate feedback which, over the lifetime of N2O (114 yr), could become as important as the climatecarbon cycle feedback caused by soil CO2 release.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available