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Development of post-fire vegetation response-ability model in grassland mountainous ecosystem using GIS and remote sensing

Author(s): Efosa G. Adagbasa, Samuel A. Adelabu, Tom W. Okello
Year Published: 2020
Description:

The mountainous grassland ecosystem in Golden Gate National Park (South Africa) has post-fire ecological resilience. However, vegetation species composition and structure can alter when the ecosystem continually has uncontrolled fires. This study developed a vegetation response-ability model by integrating environmental factors (elevation, aspect, rainfall, land surface temperature, soil, and fire severity), adaptive strategies (flowering months, water requirements, resprouter/seeders) and ecological status (increaser or decreaser) for the park. Vegetation recovery index derived from pre- and post-fire normalised difference vegetation index (NDVI) was used with correlation and regression analysis to validate the model. The results showed that amongst the environmental variables, elevation and fire were the most important factors influencing vegetation response-ability followed by soil, aspect, rainfall, and land surface temperature. Almost half (48%) of the park had a high vegetation response-ability, 43% medium, and 9% low. On the other hand, the vegetation recovery index showed 34% of the park fully recovered to pre-fire conditions, while 61% and 5% largely and slightly recovered, respectively. There was a strong correlation between vegetation response-ability and vegetation recovery index. The regression analysis showed a good relationship between vegetation response-ability and vegetation recovery index (R = 0.91) with 83.34% coefficient of determination.

Citation: Adagbasa, Efosa G.; Adelabu, Samuel A.; Okello, Tom W. 2020. Development of post-fire vegetation response-ability model in grassland mountainous ecosystem using GIS and remote sensing. ISPRS Journal of Photogrammetry and Remote Sensing 164:173-183. https://doi.org/10.1016/j.isprsjprs.2020.04.006
Topic(s): Fire Ecology, Fire Effects, Mapping, Recovery after fire, Resilience
Ecosystem(s): None
Document Type: Book or Chapter or Journal Article
NRFSN number: 21458
FRAMES RCS number: 61268
Record updated: Jul 8, 2020