Soil processes dominate the long-term response of forest net primary productivity to increased temperature and atmospheric CO2 concentration
| Autor: | Roderick C. Dewar, Belinda E. Medlyn, Ross E. McMurtrie, Mark P. Jeffreys |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Global and Planetary Change
010504 meteorology & atmospheric sciences Ecology Soil organic matter Soil biology Global warming Soil chemistry Climate change Primary production Forestry 04 agricultural and veterinary sciences 15. Life on land Atmospheric sciences 01 natural sciences Productivity (ecology) 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Nitrogen cycle 0105 earth and related environmental sciences |
| Zdroj: | Canadian Journal of Forest Research. 30:873-888 |
| ISSN: | 1208-6037 0045-5067 |
| Popis: | Predicting the responses of forest growth to elevated temperature (T) and atmospheric CO2 concentration ([CO2]) on decadal time scales presents a formidable challenge because of the many interacting processes involved. A key uncertainty concerns the relative importance of plant and soil processes to the overall long-term response. In this study, the plant-soil model G'DAY was used to simulate forest growth responses to T and [CO2] on different time scales for forests in cool and warm climates. An equilibrium-based graphical analysis was used to distinguish the roles played by plant and soil processes in determining the response. Doubled [CO2] caused a large initial increase (~20%) in net primary productivity (NPP), but this did not persist in the long term. By contrast, a 2°C increase in T caused a persistent long-term increase in NPP of approximately 10-15%. These responses were similar at cool and warm sites. The equilibrium analysis indicated that soil processes dominated the long-term responses predic... |
| Databáze: | OpenAIRE |
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