RELATIONSHIP BETWEEN FIRE AND VEGETATION DYNAMICS IN CHAPADA DAS MESAS NATIONAL PARK, MARANHÃO - BRAZIL: AN APPROACH FROM PHENOLOGICAL METRICS DERIVED FROM REMOTE SENSING
The Cerrado is one of the main Brazilian biomes, considered as one of the most important biodiversity hotspots on the planet. Although fire plays a very important role in the functioning of this ecosystem, the recent state of strong anthropic changes in natural fire regimes are a significant threat...
| Authors: | , , , , |
|---|---|
| Format: | article |
| Status: | Published version |
| Publication Date: | 2024 |
| Country: | Brasil |
| Institution: | Universidade Federal de Roraima (UFRR) |
| Repository: | Revista geográfica acadêmica |
| Language: | Portuguese |
| OAI Identifier: | oai:oai.revista.ufrr.br:article/8276 |
| Online Access: | https://revista.ufrr.br/rga/article/view/8276 |
| Access Level: | Open access |
| Keyword: | Cerrado Fogo NDVI TIMESAT Fenologia vegetativa Unidade de Conservação da Natureza Vegetação Áreas protegidas Fire Vegetative phenology Conservation Units Vegetation Protected areas Fuego Fenología vegetativa Unidades de conservación Vegetación Areas protegidas |
| Summary: | The Cerrado is one of the main Brazilian biomes, considered as one of the most important biodiversity hotspots on the planet. Although fire plays a very important role in the functioning of this ecosystem, the recent state of strong anthropic changes in natural fire regimes are a significant threat to its conservation. In this context, this article aims to monitor the historical time series of the NDVI between the years 2000 and 2018 in the region of the Chapada das Mesas National Park (PNCM). Thus, first, a classification of the Cerrado plant physiognomies in the area was generated based on a mosaic of high spatial resolution images (Dove PlanetScope), using the random forest algorithm, while the fire history (between 2000-2018) of the area was obtained based on time series dataset of Landsat images. In a second time, smoothed NDVI time series images from MODIS sensor were processed with TIMESAT software, where metrics related to the phenological cycle of vegetation (beginning, peak and end of vegetation growth cycle, its duration and maximal productivity) were derived. We found that the increase or decrease in fire occurrence promotes a change in the phenological cycles of the vegetation, changing the beginning and end dates of the vegetation growing cycle, as well as the maximum levels of NDVI. Our results highlight the potential for using remote sensor data to use the vegetative phenology as an indicator to assess the effects of fire on vegetation dynamics, generating information that can contribute to a better management and monitoring of fires in the PNCM, since this is one of the greatest riches ecosystems of the cerrado biome in the State of Maranhão. |
|---|