RESUMODiante da importância da irrigação em um cenário marcado pela crescente demanda por alimentos, é cada vez mais necessária a adoção de técnicas que possibilitem o devido monitoramento das áreas irrigadas a fim de se observar a dinâmica das condições dos cultivos. Isso se faz possível, de uma maneira rápida e de baixo custo, por meio de técnicas de sensoriamento remoto. Nesse contexto, o presente trabalho teve como objetivo avaliar, com auxílio do sensoriamento remoto, a variabilidade espaço-temporal das condições da vegetação em uma área irrigada por pivô central como subsídio ao manejo da agricultura irrigada. Para tanto, foi utilizada uma série de imagens Sentinel 2A, referente ao período de março a julho de 2016. As imagens foram submetidas ao pré-processamento, para, posteriormente, ser realizada a análise da vegetação através dos índices NDVI (Normalized Difference Vegetation Index) e do VCI (Vegetation Condition Index). A utilização do sensoriamento remoto no presente estudo possibilitou o acompanhamento da variabilidade da condição de vegetação, tendo os índices de vegetação se mostrado sensíveis às variações do vigor da mesma, e constituindo, portanto, uma importante fonte de informação na tomada de decisão para o manejo de irrigação.Palavras-chave: manejo da irrigação, sensoriamento remoto, índices de vegetação. SPATIO-TEMPORAL VARIABILITY OF VEGETATION CONDITION IN IRRIGATED AGRICULTURE THROUGH SENTINEL-2A IMAGES ABSTRACTGiven the importance of irrigation in a scenario which is highlighted by the increasing demand for food, it is increasingly necessary to adopt techniques that allow proper monitoring of irrigated areas in order to observe the dynamics of crop conditions. This is possible, in a fast way and with low cost, using remote sensing techniques. In this context, this study aimed to

Global population growth drives the increase in demand for water and food. Consequently, there is a build‐up of pressure for land use for agricultural production, creating the necessity of sacrificing areas previously occupied by the native land cover to create production areas. However, globally, the possibilities of agricultural frontier expansion are limited, and agricultural expansion activities conducted without adequate planning can accelerate the erosive processes that decrease the potential land production capability. In an attempt to attenuate environmental imbalances, payment for ecosystem services (PES) programmes have been created, highlighting the possibility of their being applied in the agricultural sector. This study developed a methodology for PES that follows the basic principles of the land use capability classification system proposed by the United States Department of Agriculture. However, the study aimed to make the classification process operational in a way that notes the conditions in which a rural property maintains its production capability without jeopardizing its environmental role. In this way, it is possible to evaluate whether a rural property is suitable to receive PES. To detail the steps for applying the methodology, a case study was conducted on a rural property in the town of Itabira, Minas Gerais State, Brazil.

Land use capability systems do not present any considerations regarding recharge zones (RZs). To improve conservation planning, the objective of this study was to present a parametrization method for the land use capability of recharge zones (LUC-RZ). RZs were characterized as the upper thirds of the elevations of all slopes with rectilinear, concave and/or convex features in the terrains. The LUC-RZ were parameterized based on the slope of the middle third of the elevations. The proposed methodology was applied to the Doce River basin (DRB) in Brazil, and 27.9% of the total area was characterized as RZs. It was found that 61.9% of the RZs area could be exploited through agricultural and livestock use; however, the usability of most of these areas was conditional on the adoption of rigorous soil and water conservation techniques. The remaining 38.1%, which was equivalent to 10.6% of the DRB, was restricted to native forest cover. Of the 61.9% of RZs area that could be used for agriculture and livestock, 18.2% was occupied by native vegetation. These areas are protected by law and are responsible for several ecosystem services and thus must be preserved. The parameterization of the LUC-RZ was sensitive to pedogeomorphological characteristics. The methodology used for the determination of the recharge zones has a strong theoretical basis and was simple to implement and therefore has great potential for use in multicriteria analyses for determining recharge zones.

A Zona da Mata Mineira foi alvo do intenso cultivo de café, contribuindo para redução, e consequente fragmentação, da Mata Atlântica na Região. A Universidade Federal de Viçosa (UFV) possui, em seu Campus sede situado na cidade de Viçosa/MG, fragmentos de vegetação de Mata Atlântica, que são importantes para a manutenção da flora e fauna locais. Sendo assim o presente trabalho teve como objetivo, num primeiro momento, propor adequações para as áreas de vegetação permanente, e, posteriormente, indicar corredores ecológicos interligando os fragmentos de vegetação de modo a garantir o fluxo gênico entre os remanescentes florestais dentro do Campus. Para isso foi utilizada uma imagem Ikonos do ano de 2007 do campus da universidade e por meio dela mapeou-se a hidrografia e também foi feita a classificação do uso do solo adotando como critério a interpretação visual. Em seguida, procedeu-se com a delimitação das áreas de preservação permanente de acordo com os critérios do Novo Código Florestal Brasileiro (Lei 12.651/2012). Como resultado, obteve-se a necessidade de se recuperar 54,68 ha de Áreas de Preservação Permanente (APP) para adequá-la a legislação vigente, assim como a criação de 9,58 ha de corredores ecológicos para a ligação entre os remanescentes florestais.Palavras-chave: área de preservação permanente, uso e ocupação do solo, Mata Atlântica. INDICATING OF ECOLOGICAL CORRIDORS AND PERMANENT PRESERVATION AREA IN THE FEDERAL UNIVERSITY OF VIÇOSA ABSTRACTThe Atlantic Forest of Minas Gerais was specially reached by coffee agriculture that caused reduction and fragmentation of the forest. The main campus of Federal University of Viçosa, has Atlantic Forest fragmentation that is very important for flora and fauna conservation. This paper had the objective to propose adequation for permanent vegetation areas and indicate ecological corridors location linking the vegetation fragments to ensure the gene flow of forest species in the university Campus. It was utilized an IKONOS image corresponding to 2007 which was used to map the hydrography and to classify the soil use by visual interpretation. The permanent vegetation areas was delimitating according New Brazilian Forest Code (Law 12.651/2012). As result, is necessary to recover 54,68 ha of permanent conservation areas (APP), for legal regularization, and to create 9,58 ha of ecological corridors to link fragment vegetation.Keywords: permanent preservation area, land use, Atlantic Forest. DOI: http://dx.doi.org/10.14583/2318-7670.v04n06a12