2019
DOI: 10.1590/1678-992x-2017-0173 View full text |Buy / Rent full text
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Abstract: This study aimed to characterize the average seasonal pattern of the vegetation in southern grassland in Brazil, and the variability found in the time series of vegetation indices. It also sought to identify similarities in the seasonal pattern of different grassland typologies. Moderate Resolution Imaging Spectroradiometer (MODIS), Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) images from Feb to Dec, 2000 to 2014 were analyzed for ten regions. The grassland typologies studi… Show more

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“…Thus, the vegetation indices (particularly, NDVI, OSAVI, EVI, and others) are widely used for plant remote sensing on the basis of manual measurements and different mobile platforms, including UAS and satellites [23,49,53]. Vis can be used for the remote sensing of spatial [59] and temporal [109] changes in the green vegetation, including the estimation of the morphological characteristics of plants (e.g., LAI or the total biomass [74,99,101]) or activity of important physiological processes (e.g., the light absorption by leaves or gross primary productivity (GPP) [110]). These changes can be observed for weeks, season(s), year(s), or tens of years [49,106,109].…”
Section: Reflectance Index Formula Referencesmentioning
“…Vis can be used for the remote sensing of spatial [59] and temporal [109] changes in the green vegetation, including the estimation of the morphological characteristics of plants (e.g., LAI or the total biomass [74,99,101]) or activity of important physiological processes (e.g., the light absorption by leaves or gross primary productivity (GPP) [110]). These changes can be observed for weeks, season(s), year(s), or tens of years [49,106,109]. Flying platforms, including UAS and satellites, are widely used for measurements of the vegetation indices; particularly, satellites can be used for measuring the GPP and other parameters on an ecosystem and landscape scale.…”
Section: Reflectance Index Formula Referencesmentioning
“…The rocky substrate consists of intermediate volcanic rocks (andesites and basalts) [92]. The area belongs to the Pampa Biome, where the Vachellia caven grasslands predominate [93]. However, there is a high grassland conversion to crop areas, mainly from rice and secondarily to soybeans, corn, and vegetables.…”
Section: Study Areamentioning
“…Moreover, the specific features of each biome are essential to formulate proper conservation strategies, appropriate infrastructure, and to understand the impacts of land use changes in each environment (Oliveira et al 2017;Wagle et al 2017). Natural grasslands are fundamental to preserve water resources and carbon accumulation in the soil (Moreira et al 2019) and around the world they cover vast regions including the North American Great Plains, the Eurasian steppes of Russia, China and Mongolia, and the South American Pampas (Chaneton et al 2012). In Brazilian territory, the Pampa biome represents 2.07% and is recognized as containing a rich biodiversity characterized by a meadow mosaic, with small scrub vegetation areas and forests (Ruviaro et al 2016).…”
Section: Introductionmentioning
“…Although there are a considerable number of studies on the seasonal variations of Pampa biome vegetation along with climate variables, vegetation-LST relationship is not properly addressed on the literature. Most researches focused on air temperature data in conjunction with IVs or applied LST standard products (Fontana et al 2018;Moreira et al 2019), which present known limitations (Mukherjee et al 2014;Simó et al 2016).…”
Section: Introductionmentioning