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Impact of Shading of a Silvopastoral System on Microclimate and Botanical Composition of Polyphytic Pasture: A Preliminary Study in the Subtropics

Vieira Frederico Márcio C., Militão Érica R., Wagner Júnior Américo, Herbut Piotr, Mayer Lilian Regina R., Vismara Edgar S., Vieira Afrânio Márcio C., Paris Wagner, Hermes Cátia, Paśmionka Iwona

Journal of Ecological Engineering

2021

Vol. 22, nr 10

215--224

The silvopasture system is an integrated system which has been widespread in tropical and sub-tropical climates. However, there is a lack of detailed studies regarding agroecological silvopasture systems. This study assessed whether the different levels of shading in an agroecological silvopastoral system influences the microclimate and botanical composition of polyphytic pasture. We used eight paddocks composed of a silvopastoral system in a subtropical climate, with different tree species arranged in simple lines with polyphytic pasture. In each paddock, we established three levels of visual shading (under the canopy, intermediate and full sun). The following microclimatic variables were recorded monthly during the daytime: illuminance, air temperature, air relative humidity, wind speed, and surface soil temperature. The samples of forages were separated into grasses, legumes and spontaneous, then fractionated into leaves, stems, and senescent material. We observed lower values of illuminance and surface soil temperature under the canopy, with differences between full sun and under the canopy at noon. Regarding the forage, the percentage of legumes was higher in full sun, and spontaneous species and leaves had high proportions under the canopy. Based on the results, the agroecological silvopastoral system changed the microclimatic characteristics and altered the plant composition of polyphytic pasture.

Dynamics of Microclimate Conditions in Freestall Barns During Winter – a Case Study from Poland

Angrecka Sabina, Herbut Piotr, Godyń Dorota, Vieira Frederico Márcio Corrêa, Zwolenik Monika

Journal of Ecological Engineering

2020

Vol. 21, nr 5

129--136

The climate changes observed in recent years as an increase in the average air temperature influence the microclimatic conditions in dairy barns not only in summer but also in winter. The heat emitted by cows, the orientation of buildings to the cardinal points and farm layout have substantial effect and are additional factors influencing the microclimate in the barns with curtain sidewalls. The aim of the present studies was to determine the effect of atmospheric air temperature and relative humidity on the selected parameters of the indoor microclimate in two neighboring freestall barns in winter. The air temperature and relative humidity sensors were positioned in the barns (A, B) and outdoors. The obtained results were compared with each other. The indoor air temperature recorded in two barns was higher than the outdoor temperature by an average of 2.4°C and 2.8°C, respectively. The greatest difference between the average indoor and the outdoor air temperature was 4.9°C. Daily analysis indicated that in warm days, the patterns of the air temperature and relative humidity changes were similar in both barns. In turn, during cold days, when the outdoor air temperature was below 0°C, there was a difference in temperature between both barns, which could result from the position of the buildings towards cardinal points and the heat emitted by cattle influencing the air temperature in the barn. The points where the temperature difference was the highest were located in the leeward part of the building, which was additionally sunlit during the midday hours. Thus, it is recommended to estimate the airflow velocity and sun exposure in different zones of the barn. This would also help to establish the guidelines for the design of new barns in the context of architectural and spatial solutions.