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| Titel |
Response of the grassland ecosystem to climate change in a theoretical model |
| VerfasserIn |
Guodong Sun, Mu Mu |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250032714
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| Zusammenfassung |
| The response of a grassland ecosystem to climate change was investigated within a
theoretical model. An optimization approach, i.e., a conditional nonlinear optimal
perturbation related to parameter (CNOP-P) approach, was employed in this study.
The CNOP-P, which is a perturbation of a moisture index in the theoretical model,
represents a nonlinear climate perturbation. A linear climate perturbation was also used
in order to study the grassland ecosystem response to different types of climate
change.
The numerical results show that the extent of grassland ecosystem variation caused by
CNOP-P-type climate change is greater than that caused by the two kinds of linear climate
change. In addition, the grassland ecosystem affected by CNOP-P-type climate change
evolves into a desert ecosystem, while the two kinds of linear climate change 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 were found for a desert ecosystem 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. This study implies that the CNOP-P approach is a
potentially effective tool for assessing the impact of climate change on the grassland
ecosystem. |
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