Resumo

INTERIAN-KU, V.M.; VALDEZ-HERNANDEZ, J.I.; CAZARES-SANCHEZ, E.  e  GONZALEZ-RODRIGUEZ, F. de J.. Impact of environmental variables on fenology of Caesalpinia gaumeri Greenm and Gymnopodium floribundum Rolfe in the south of Yucatan, Mexico. Polibotánica [online]. 2018, n.45, pp.115-129. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.45.9.

In order to contribute to the phenological knowledge of the arboreal flora with importance for beekeeping and rural constructions in Yucatan, Mexico, 24 individuals of Gymnopodium floribundum Rolfe and 24 of Caesalpinia gaumeri Greenm were selected in the low deciduous forest of the Community of Dzan Phenological events were recorded for each period of two years: foliar, floral and fructification coverage (0 = null, 1 = 1-33%, 2 = 34-66% and 3 = greater than 66%). The maximum and minimum temperature of the environment, relative humidity and precipitation were also recorded to correlate them with the phenological events. The results show a positive and highly significant correlation between relative humidity and leaf cover in G. floribundum, and a negative correlation between floral cover and partial precipitation and mean monthly temperature in C. gaumeri. During dry or less rainy months, both species reduce leaf cover and at the same time flowering occurs and only in the case of C. gaumeri, fruiting was observed. No significant differences were found for leaf cover in G. floribundum trees grouped by size classes, but in C. gaumeri, where the laticians presented greater leaf cover during the study period. It can be concluded that the climatic elements studied affect the phenological behavior of both species, as well as the position of C. gaumeri individuals within the vertical structure of the canopy.

Palavras-chave : Caesalpinia gaumeri; Gymnopodium floribundum; flowering; defoliation; precipitation; temperature; relative humidity.