Impacts of dry and frost period on vigor of vegetation: a case study for the Guariroba watershed, Campo Grande, Mato Grosso do Sul

• Autor(a) principal: Capoane, Viviane
• Data de Publicação: 2022
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista Cerrados (Montes Claros. Online)
• Texto Completo: https://www.periodicos.unimontes.br/index.php/cerrados/article/view/4856
• topic: Mudanças climáticas; Seca; Geada; Índice orbital; NDVI.; Climate changes; Dry; Frost; Orbital index; NDVI.; Cambios climáticos; Sequia; Escarcha; Índice orbital; NDVI.

Dry periods occur in all regions, even in humid climates, due to climatic seasonality and the dynamism of the processes which generate rainfall. Meanwhile, anthropogenic climate change is impacting precipitation and temperature patterns, and some areas of the planet are experiencing changes in the frequency and severity of weather extremes such as heavy rains, droughts, cold and heat waves, forest fires and dust storms. The Guariroba watershed is a naturally fragile environment, highly susceptible to soil erosion, however current land management practices do not take into consideration agricultural restrictions and skills. Given a context of climatic change, which constitutes a powerful stressor for ecosystems and biodiversity, this work analyzes the response of vegetation to climatic indicators based on the Normalized Difference Vegetation Index. The radiometric vegetation indices were derived from Sentinel-2 images using the software SNAP 8.0 of the year 2021. The results obtained show that the vigour of the vegetation in the Midwest region reflects the annual cycle of climatic patterns and the characteristics of temperature and precipitation. However, for the year 2021, vegetation vigour was severely impacted in response to drought and frost. Although the rainy season has started in the region and the vegetation responds to the first rains by regrowth and emergence, in the context of environmental degradation in the area and anthropogenic climate change, the 2021 scenario tends to be repeated and worsen in the coming years.