The objective of this work was to evaluate the effect of the conversion of native vegetation on agricultural areas based on Normalized Difference Vegetation Index (NDVI), surface albedo (α), brightness temperature (Tb) and net radiation (Rn) in Cerrado-Amazon transition area with Landsat images 8. The classes of land use studied were: Native forest (FN), Irrigated area (AI) and Not irrigated (AN) with agronomic crops in scenes 331 of 2015, 094 and 206 of 2016 of a farm in the North Center of the state of Mato Grosso. From the information obtained from the images together with the Automatic Smile Meteorological Station (EMA) - MT, was calculated the net radiation. The conversion of native forest to agricultural areas in the Cerrado-Amazon transition region exerts an increase in the surface albedo and the brightness temperature values and a decrease in the NDVI, consequently the reduction of the values of the net radiation. The mean values of NDVI, α, Tb and Rn found in the FN (0,86, 0,16, 24,44 °C and 598,80 W m²), AI (0,79, 0,22, 24,90 °C and 549,74 W m²) and AN (0,53; 0,28, 28,78 °C and 486,48 W m²) evidences the effect of the conversion of native vegetation in agricultural areas based on biophysical indices.
Ensuring the legal protection of geosites, or areas that have relevant geodiversity, and obtaining resources for the development of programs and actions in these territories are two of the great challenges in Brazil. This article presents an analysis of Brazilian legislation, seeking to identify the responsible bodies, sources of funds, and how each specific policy can relate to the protection and promotion of geodiversity. In addition, the proposed public policy for geodiversity, geotourism, and geoparks in the state of Mato Grosso is presented and discussed. For this, documentary research of national legislation was carried out, and existing records in the Legislative Assembly of Mato Grosso were analyzed for the Thematic Sectorial Chamber to debate the Geopark Project of Chapada dos Guimarães. The information was discussed based on a bibliographic survey with national and international references. The results show that although some geodiversity elements, such as fossils and caves, have specific legislation, there is no articulated national public policy on geodiversity that guarantees the identification, protection, and continuous management of geosites or even structural and financial support for the development of geoparks in Brazil. The creation of policies at the state or national level, aimed at establishing a managing body and permanent sources of funds, can be an important step to enable the development of actions related to the protection and dissemination of geodiversity, linked or not to geopark proposals. At the international level, the creation of a United Nations Educational, Scientific and Cultural Organization (UNESCO) convention that establishes clear bases for the dissemination and protection of geodiversity could encourage the development of policies in different countries as an international framework to guide themes.
RESUMO:O Grupo Alto Jauru, localizado no sudoeste do Cráton Amazônico, região da fazenda Retiro Novo, é constituído por biotitamuscovita-quartzo xistos, clorita-biotita-muscovita xistos, granada-cordierita-biotita xisto e estaurolita-andalusita-biotita xisto, associados a granada-sillimanita-biotita gnaisse, biotita gnaisse, anfibolitos e muscovita granito. O grupo apresenta evidências de representar prisma acrescionário dominado por sedimentos. A petrografia e as relações estruturais indicam que foi afetado por dois eventos deformacionais, D n e D n+1, com as foliações associadas S n (xistosidade e bandamento gnáissico) e S n+1 (clivagem de crenulação) e por três eventos metamórficos (M1, M2 e M3): o primeiro é contemporâneo à S n de fácies xisto verde inferior; o segundo é associado à fase S n+1 de fácies xisto verde a anfibolito; o terceiro evento é térmico de fácies anfibolito, resultado da intrusão do Tonalito Cabaçal. A determinação geocronológica obtida pelo método U-Pb (SHRIMP) em zircão forneceu idade de 1819 ± 6,7 Ma para a cristalização do protólito ígneo do biotita gnaisse. Do ponto de vista geotectônico, o Grupo Alto Jauru corresponde a prisma acrescionário formado no Estateriano. PALAVRAS-CHAVE:Grupo Alto Jauru; Cráton Amazônico; geocronologia U-Pb; prisma acrescionário. ABSTRACT: The Alto Jauru Group, located in southwestern Amazonian Craton, region of Retiro Novo Farm, comprises biotite-muscovite-quartz schists, chlorite-biotite-muscovite schists, garnet-cordierite-biotite schist and staurolite-andalusite-biotite schist
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