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Algumas medidas microclimáticas, em mata da região "Bromélia-Malária", em Santa Catarina, Brasil: II - Efeito do abrigo, temperaturas extremas, amplitude térmica diária, temperatura do solo, radiação global, velocidade do vento e déficit de saturação

In sequence to a paper recently published (1), we present now the mean monthly values of the following observations: error caused by the screen of the Stevenson type in the measurements of the air temperature, extremes temperatures, range of temperature, soil temperature, global radiation, wind velocity and saturation deficit. The data analysed in the figures and tables of the text indicates that: 1 - The difference observed between the temperatures taken within the screen and that registered in the sling psychrometer, when in the open air, only occasionally have any statistical significance. In the forest however mean differences of 0.5ºC are frequent. 2 - The maximum means of the maximum temperatures were always those obtained in the open air. In the forest the means are higher in the valley and lower at the heights. 3 - The differences between the minimum temperatures are clear-cut only during the winter, when in several spots within the forest, are either lower or higher than those found in the open air. During the colder months, the nocturnal inversion can produce, in the forest, a mean difference of 3ºC, for an altitude drop of 100 m. 4 - But for the valley where we sometimes registered mean values identical to those obtained in the open air, the range of temperature is always smaller in the forest. 5 - The variation of the soil temperature is conditioned by the topographical situation and the protection given by the vegetation. 6 - The attenuation of the wind is caused by the tuft of the trees. Below this layer we did not find significant variation in the mean values of the wind velocity. 7 - The saturation deficit can give more precise information about the air humidity in the forest than the relative humidity.


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