Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/10486
Title: Aspectos ecofisiológicos de Vochysia thyrsoidea POHL. em Cerrado Rupestre no sul de Minas Gerais
Other Titles: Ecophysiological aspects of Vochysia thyrsoidea Pohl. in a "Cerrado Rupestre" in the South of Minas Gerais
Authors: Barbosa, João Paulo Rodrigues Alves Delfino
Polo, Marcelo
Rodrigues, Marcelo
Barbosa, Ana Carolina Maioli Campos
Teodoro, Grazielle Sales
Keywords: Afloramento rochoso
Disponibilidade hídrica
Radiação
Trocas gasosas
Adaptação
Rocky outcrop
Water availability
Radiation
Gas exchange
Adaptation
Issue Date: 19-Oct-2015
Publisher: Universidade Federal de Lavras
Citation: MELO, N. C. de. Aspectos ecofisiológicos de Vochysia thyrsoidea POHL. em Cerrado Rupestre no sul de Minas Gerais. 2015. 110 p. Tese (Doutorado em Botânica Aplicada)-Universidade Federal de Lavras, Lavras, 2015.
Abstract: The Cerrado domain covered an area of approximately 2 million km 2 in the center of Brazil. However, due to the severe conversion of natural areas into anthropic areas it has been described as a hotspot for the conservation of the biodiversity. Cerrado is characterized by a well-defined dry season with acidic and nutrient-poor soils. Moreover, fire is a common disturbance affecting the growth and distribution of species. Within the different domain phytophysiognomies, there is the rocky cerrado, defined by long periods with low water availability, high luminous intensity, high altitudes, and vegetation on rocky outcrops. Among species, Vochysia thyrsoidea stands out for its high ability to adapt to the environment. Thus, this work aimed to evaluate the physiological and growth responses of V. thyrsoidea individuals in two rocky cerrado areas located in Parque Ecológico Quedas doRio Bonito (PEQRB) and in Reserva Biológica Unilavras-Boqueirão (RBUB). Ineach area, we selected 30 medium to high individuals (>2.50 m and DAP ≥5 cm) and 30 short individuals (<1.70 m and DAS < 3 cm). The radial growth, height, growth of branches, newleaf sprouting, and morphophysiological characteristics were evaluated. The environmental characterization of areas was performed and the water content in soil was obtained using the climatological water balance calculation. The years comprising the study were marked by low rainfall and even during the dry season it was possible to notice that V. thyrsoidea demonstrated increased net photosynthesis, stomatal conductance, and transpiration. In RBUB, higher radial growth rates were observed in periods with higher rainfall, showing a clear seasonality. Results indicate that there is a differentiation regarding the growth of V. thyrsoidea individuals from the two areas. Small PEQRB individuals invested more in height growth and leaf sprouting whereas RBUB individuals had a higher allocation of carbon to the growth of branches (cm), leaf area, and stem diameter. Even with fire episodes in RBUB areaand hailstorm in PEQRB during the study, the species exhibited a great recoverability. The different morphophysiological strategies exhibited by V. thyrsoideademonstrate that this species may easily colonize the environment and stands out for its easy adjustment to the environment, and it has some adaption strategies to grow and develop to face the adverse conditions which characterize the Cerrado domain.
URI: http://repositorio.ufla.br/jspui/handle/1/10486
Appears in Collections:Botânica Aplicada - Doutorado (Teses)



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