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There was similar dynamic of Tar and UR between the condition of full sun and the black and colored polyolefin screens throughout the day and year however, with a significant increase in the mean values of Tar and UR in these protected environments. In the Statistical performance evaluation of the regressions were used the statistical indicators: coefficient of determination (R2), the mean error (MBE), root mean square error (RMSE) and Willmott's index of adjustment (d).
70 and 30% of the data were used to generation and validation the regressions, in each data group, respectively.
The data of the micrometeorological monitoring were grouped according to the regional water stations (dry, dry-rainy, rainy and rainy-dry), with separation of the database for ten years. Micrometeorological assessments were performed in suspended modules forest nurseries, aligned to the East-West direction, between June 2017 and April 2019, under black screens with increasing levels of shading (35, 50, 65 and 80%) and colored / spectral (thermo-reflector, red, blue and green, all with 50% shading). Dynamics and estimates of air temperature and relative humidity in nurseries protected with different shading ABSTRACT: The objective was to describe the daily dynamics of temperature (Tar) and relative humidity (RH) in protected environments with different polyolefin shading screens in transition region of Cerrado-Amazonia of Mato Grosso in addition, the uses regressions of estimation of Tar and RH in shaded environments based on the same variables measured in full sun were evaluated. Palavras-chave: ambientes protegidos micrometeorologia indicadores estatísticos transição Cerrado-Amazônia.
O d variou de 0,96 a 0,99, indicando que as regressões de estimativas da Tar e UR ajustadas apresentam desempenho satisfatório para todas as estações hídricas regional nos ambientes sombreados. Os valores de R² foram satisfatórios, demonstrando que mais de 60% da variável dependente (Tar nas telas de sombreamento) está relacionada à variável independente (Tar na condição de pleno sol). Houve dinâmica similar de Tar e UR entre a condição de pleno sol e as telas poliefinas pretas e coloridas ao longo do dia e do ano porém, com aumento expressivo nos valores médios da Tar e UR nesses ambientes protegidos. Na avaliação do desempenho estatístico das regressões foram empregados os indicadores estatísticos: coeficiente de determinação (R2), erro absoluto médio (MBE), raiz quadrada do erro quadrático médio (RMSE) e índice de Willmott (d). Foram empregados 70 e 30% dos dados para geração e validação das regressões, em cada agrupamento de dados, respectivamente. Os dados do monitoramento micrometeorológico foram agrupados em função das estações hídricas regionais (seca, seca-chuvosa, chuvosa e chuvosa-seca), com separação da base de dados por decêndios. As avaliações micrometeorológicas foram realizadas em viveiros florestais modulares suspensos, alinhados no sentido Leste-Oeste, entre junho de 2017 e abril de 2019, sob telas pretas com níveis crescentes de sombreamento (35, 50, 65 e 80%) e coloridas/espectrais (termorefletora, vermelha, azul e verde, todas com 50% de sombreamento). Objetivou-se descrever a dinâmica diária da temperatura (Tar) e umidade relativa do ar (UR) em ambientes protegidos com diferentes telas poliefinas de sombreamento, na região de transição Cerrado-Amazônia do Mato Grosso ademais, foram avaliados os usos de regressões de estimativa de Tar e UR nos ambientes sombreados com base nas mesmas variáveis medidas em pleno sol. Blue screen (T4) treatment also presented the highest relative humidity difference between inside and outside conditions. The highest temperature was observed under blue screen (T4) treatment, which was 1.3 ☌ higher than external condition. For PAR and Rn the same tendency was observed. The black screen (T5) had the lowest solar radiation transmissivity (10.4%).
The control (T2) and red screen (T3) treatments promoted the highest solar radiation transmissivity, respectively 56.3 and 27%. An automatic micrometeorological station was installed in each treatment, measuring air temperature (T), relative humidity (RH), incoming solar radiation (Rg), photosynthetically active radiation (PAR) and net radiation (Rn) continuously. The experiment was conducted with five treatments: thermo-reflective screen (T1) a control - without screen (T2) red screen (T3) blue screen (T4) and black screen (T5), all of them with 70% of shading. This study had as its objective the evaluation of the influence of shading screens of different colors on the different microclimate variables in a greenhouse covered with transparent low-density polyethylene (LDPE).
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