A B S T R A C TThe unplanned use of the resources of the caatinga biome has been provoking several environmental degradation processes, which interferes negatively in the physical and biological systems of the semi-arid region. Thus, the present study aimed to analyze the biophysical differences in areas of preserved and degraded caatinga, as well as irrigated and dry farming areas. Two images of the satellite Landsat 8 -Sensor OLI, corresponding to 05/22/2016 and 17/01/2017 were made. In which the reflectance, NDVI and NDWI calculations were applied. The results showed a difference in the values of NDVI and NDWI between the images of 2016 and 2017 according to the different types of vegetation. The areas of caatinga presented predominance of NDVI values from 0.4 to 0.6. Higher NDVI and NDWI characterized irrigated perimeters than in caatinga and dryland areas. Such differences between the analyzed days were the result of the absence and/or low amount of precipitation in the months before the imaging days. As for irrigated agriculture, which has a greater availability of water, than the influence on the nature of plants and in the moisture content present in the soil. Keywords: Semi-arid, biophysical parameters, vegetation. R E S U M OO uso não planejado dos recursos do bioma caatinga vem provocando diversos processos de degradação ambiental, os quais interferem negativamente sobre sistemas físico-naturais e biológicos da região semiárida. Sendo assim, o presente estudo teve como objetivo analisar as diferenças de parâmetros biofísicos em áreas de caatinga preservada e degradada, bem como das áreas de agricultura irrigada e sequeiro. Foram utilizadas duas imagens do satélite Landsat 8 -Sensor OLI, correspondentes aos dias 22/05/2016 e 17/01/2017. Nas quais foram aplicados os cálculos de reflectância, NDVI e NDWI. Os resultados mostraram uma diferença nos valores de NDVI e NDWI entre as imagens de 2016 e 2017 de acordo com os diferentes tipos de vegetação. As áreas de caatinga apresentaram predominância de valores de NDVI de 0,4 a 0,6. Os perímetros irrigados destacaram-se por apresentar NDVI e NDWI maiores do que nas áreas de caatinga e de sequeiro. Tais diferenças entre os dias analisados resultaram da ausência e/ou baixa quantidade de precipitação

The semi-arid region of northeastern Brazil has a strong tendency to decrease precipitation with climate change. It is known that the social, economic, and environmental impacts will be very high if this happens. Evapotranspiration and water balance are important variables in public policy decision-making related to rain and water resources, as it allows for greater knowledge of the water supply in each region. Thus, evaluating different estimation methodologies for these variables provides an important contribution to the planning of environmental public policies. Given the above, this study aims to evaluate the evapotranspiration estimated with MODIS and the water balance obtained with the Soil Water Assessment Tools (SWAT) for the Pontal basin, Pernambuco, Brazil, for the year 2016. The results show the great dependence of actual evapotranspiration and runoff on the volume of rainfall in the basin. It was possible to verify that the preserved caatinga areas had the highest evapotranspiration throughout the year. Also noteworthy is the volume of water stored in the soil in these areas. The largest volume drained was present in agriculture and livestock and exposed soil. These results show the impacts of anthropic actions on the natural resources of the Po ntal basin, which can lead to greater complications in the region's land cover and water balance.

Developing of the manuscript, production of the results and graphics and interpretation of data; RSN: constructions of the ideas, elaboration of manuscript and support in the analysis of the relationships between climatic variables and dengue incidence; PSB: contribution in the interpretation and showing of the structure of methodology; JPF: contributions to analyze epidemiological characteristics and constructions of the ideas; JHA: contributions to analyze, review and constructions of the ideas; EBM: contributions to analyzing relationships between dengue and climatic variables; ECM: contributions with discussions of ideas and review; WBL: contributions with the review of the manuscript.

Revealed preferences of cultural ecosystem services of the landscape in an urban cemetery of a city in the northeast of brazilReveló las preferencias de los servicios del ecosistema cultural del paisaje en un cementerio urbano de una ciudad del noreste del brasil