Determinação Do Albedo De Superfície Em Áreas Irrigadas Do Projeto Jaíba (Minas Gerais), Mediante Imagens Landsat 5 - Tm

Veloso, Gabriel Alves; Ferreira, Manuel Eduardo; Rosa, Roberto; Silva, Bernardo Barbosa da

doi:10.5380/raega.v35i0.39757

Cited by 4 publications

(5 citation statements)

References 5 publications

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“…The highest mean albedo value for the Pasture, even with greater rainfall, was confirmed by the statistically significant difference between the means in the two experimental sites (according to Table 1), within a confidence level of 95%. A higher albedo value for Pasture was expected and is in line with what has been pointed out by other research [24,37,53,54,56,57]. This is because the pasture has characteristics of sparse vegetation cover with more spaced and drier plants and more exposed soil, factors that contribute to the elevation of albedo values.…”

Section: Albedo Time Seriessupporting

confidence: 89%

Caatinga Albedo Preserved and Replaced by Pasture in Northeast Brazil

2021

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The caatinga is considered South America’s largest seasonally dry tropical forest (SDTF) and one of the most vulnerable endemic biomes in relation to climate change. The surface albedo in caatinga is relevant to understanding the role of this biome in the climate of the Northeast region of Brazil. Thus, a comparative analysis was conducted between the albedos of preserved and anthropized caatinga (pasture). Data were collected using CNR4-type net radiometers during the dry and rainy seasons. The mean albedo values were higher in the Pasture both in the dry and rainy season, with values of 0.181 and 0.177, respectively. In the caatinga, the mean albedo values were 0.137 in the dry season and 0.146 in the rainy season. The hourly average values for albedo, taken between 6:30 a.m. and 4 p.m., with intervals of 30 min, were also higher in the pasture. For convenience, this study uses local standard time (LST), which is 3 h behind from coordinated universal time (UTC). The greatest dispersions in the frequencies of the mean hourly albedo values occurred in the early morning and late afternoon. Some of the consequences of this study is the confirmation that there is an increase in albedo in caatinga replaced by pasture and this causes a reduction in the net radiation and also the finding that a region where there is adequate pasture management also enables albedo management and from solar radiation. And that further studies can indicate the impacts on temperature and precipitation, especially in warmer periods during the dry season.

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Section: Albedo Time Seriessupporting

confidence: 89%

Caatinga Albedo Preserved and Replaced by Pasture in Northeast Brazil

2021

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“…Sá, Sobrinho, Silva, Ferreira and Moura (2016) pointed out that albedo is very sensitive and can be influenced by the moisture conditions of the soil and plant, humidity, irrigation, land use and the presence of clouds. In areas of irrigated agriculture in the municipality of Jaíba-MG, Brazil, Veloso, Ferreira, Rosa and Silva. (2015) found mean α s values of the orders of 0.15 and 0.21 in the crop development period and at harvest, respectively.…”

Section: Resultsmentioning

confidence: 99%

Spatio-temporal variability of biophysical parameters of irrigated maize using orbital remote sensing

Costa

Santos

et al. 2021

Semina: Ciênc. Agrár.

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This study proposes to estimate the actual crop evapotranspiration, using the SAFER model, as well as calculate the crop coefficient (Kc) as a function of the normalized difference vegetation index (NDVI) and determine the biomass of an irrigated maize crop using images from the Operational Land Imager (OLI) and Thermal Infrared (TIRS) sensors of the Landsat-8 satellite. Pivots 21 to 26 of a commercial farm located in the municipalities of Bom Jesus da Lapa and Serra do Ramalho, west of Bahia State, Brazil, were selected. Sowing dates for each pivot were arranged as North and South or East and West, with cultivation starting firstly in one of the orientations and subsequently in the other. The relationship between NDVI and the Kc values obtained in the FAO-56 report (KcFAO) revealed a high coefficient of determination (R2 = 0.7921), showing that the variance of KcFAO can be explained by NDVI in the maize crop. Considering the center pivots with different planting dates, the crop evapotranspiration (ETc) pixel values ranged from 0.0 to 6.0 mm d-1 during the phenological cycle. The highest values were found at 199 days of the year (DOY), corresponding to around 100 days after sowing (DAS). The lowest BIO values occur at 135 DOY, at around 20 DAS. There is a relationship between ETc and BIO, where the DOY with the highest BIO are equivalent to the days with the highest ETc values. In addition to this relationship, BIO is strongly influenced by soil water availability.

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“…Moreover agribusiness causes adverse socio-environmental impacts, with emphasis on pesticide exposure [25,28,47]; changes in the pattern of cover and land use [48]; high concentration of salts and soil impoverishment due to inadequate management in irrigated perimeters [16,20]; occupational and food exposure associated with the agricultural production process [25]; a positive mean correlation between health indicators and pesticide consumption [15,25,28]; imbalance in the quality of environmental compartments that have serious risks to human health [10,20,28]; elimination of biodiversity for the implementation of large extensions of intensive monoculture [10,15]; disaggregation of family farming in the face of this development model [49]; and the emergence of new and more complex territorial conflicts between traditional communities [10,50].…”

Section: Discussionmentioning

confidence: 99%

(In)Sustainability of the Territory of Chapada Do Apodi-Rn (Brazil): The Expansion of Agribusiness versus the Impacts of Traditional Farmers and Local Rural Communities

et al. 2020

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The objective of this study is to investigate the conditions of family agriculture and the respective environmental impacts of agribusiness. The research methodology is grounded on a theoretical survey of study descriptions of the area, a characterization of rural communities and local population through interviews, an identification of medium and large agricultural enterprises through documentary research on environmental licensing processes, and determination of the environmental impacts of agribusiness via an interaction matrix. Based on the data generated, it was found that the majority of the population has an incomplete elementary education; is involved in agricultural activity, livestock farming, and honey production, which provide a family income of up to one minimum wage; and is located in rural communities with environmental sanitation restrictions. Moreover, it was found that irrigated agriculture has positive impacts, such as the generation of employment and income. It was also evidenced that this activity causes adverse socioeconomic impacts and adverse impacts on the traditional activities of local rural communities through plant removal, water scarcity, and pesticide use. Thus, to mitigate the problems, it is necessary to apply the principles of Brazilian Environmental Law as correlated with the instruments of the National Environment Policy through environmental management guidelines.

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Determinação Do Albedo De Superfície Em Áreas Irrigadas Do Projeto Jaíba (Minas Gerais), Mediante Imagens Landsat 5 - Tm

Cited by 4 publications

References 5 publications

Caatinga Albedo Preserved and Replaced by Pasture in Northeast Brazil

Caatinga Albedo Preserved and Replaced by Pasture in Northeast Brazil

Spatio-temporal variability of biophysical parameters of irrigated maize using orbital remote sensing

(In)Sustainability of the Territory of Chapada Do Apodi-Rn (Brazil): The Expansion of Agribusiness versus the Impacts of Traditional Farmers and Local Rural Communities

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