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Details van artikel 24 van 45 gevonden artikelen
| Titel: |
Interactions between nitrogen deposition, land cover conversion, and climate change determine the contemporary carbon balance of Europe |
| Auteur: |
G. Churkina S. Zaehle J. Hughes N. Viovy Y. Chen M. Jung B. W. Heumann N. Ramankutty C. Rödenbeck M. Heimann C. Jones |
| Verschenen in: |
Biogeosciences discussions |
| Paginering: | Jaargang 7 (2010) nr. 2 pagina's 2227-2265 |
| Jaar: |
2010 |
| Inhoud: |
European ecosystems are thought to uptake significant amounts of carbon, but neither the rate nor the contributions of the underlying processes are well known. In the second half of the 20th century, carbon dioxide concentrations have risen by more than 100 ppm, atmospheric nitrogen deposition has more than doubled, and European mean temperatures were increasing by 0.02 °C per year. The extents of forest and grasslands have increase with the respective rates of 5800 km<sup>2 yr-1 and 1100 km<sup>2 yr-1 as agricultural land has been abandoned at a rate of 7000 km<sup>2 yr-1. In this study, we analyze the responses of European land ecosystems to the aforementioned environmental changes using results from four process-based ecosystem models: BIOME-BGC, JULES, ORCHIDEE, and O-CN. All four models suggest that European terrestrial ecosystems sequester carbon at a rate of 100 TgC yr-1 (1980–2007 mean) with strong interannual variability (± 85 TgC yr-1) and a substantial inter-model uncertainty (± 45 TgC yr-1). Decadal budgets suggest that there has been a slight increase in terrestrial net carbon storage from 85 TgC yr-1 in 1980–1989 to 114 TgC yr-1 in 2000–2007. The physiological effect of rising CO2 in combination with nitrogen deposition and forest re-growth have been identified as the important explanatory factors for this net carbon storage. Changes in the growth of woody vegetation are an important contributor to the European carbon sink. Simulated ecosystem responses were more consistent for the two models accounting for terrestrial carbon-nitrogen dynamics than for the two models which only accounted for carbon cycling and the effects of land cover change. Studies of the interactions of carbon-nitrogen dynamics with land use changes are needed to further improve the quantitative understanding of the driving forces of the European land carbon balance. |
| Uitgever: |
Copernicus GmbH (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 24 van 45 gevonden artikelen
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