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| Titel |
Response of the grassland ecosystem equilibrium state to climate change within a theoretical model |
| VerfasserIn |
Guodong Sun, Mu Mu |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250047648
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| Zusammenfassung |
| The response of a grassland ecosystem equilibrium state to climate change is discussed within a theoretical model. An optimization approach, i.e., a conditional nonlinear optimal perturbation related to parameter (CNOP-P) approach, is employed in this study. Two kinds of linear type climate perturbations are also used in order to study the grassland ecosystem equilibrium state response to different types of climate changes. The numerical results show that the extent of grassland ecosystem variation caused by the CNOP-P-type climate change is greater than that caused by the two kinds of linear type climate changes. In addition, the grassland ecosystem affected by the CNOP-P-type climate change evolves into a desert ecosystem equilibrium state, while the two kinds of linear type climate changes fail within a specific amplitude range when the moisture index recovers to its reference state. This demonstrates that the grassland ecosystem response to climate change is nonlinear. Similar results are found for a desert ecosystem equilibrium state seeded with litter of both living and wilted biomass. The numerical analysis also accounts for the role of soil moisture in the root zone and the shading effect of wilted biomass on the grassland ecosystem through the nonlinear interaction between the soil and the vegetation. |
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