Abstract

PINEDA-HERRERA, Elizandro; VALDEZ-HERNANDEZ, Juan Ignacio  and  LOPEZ-LOPEZ, Miguel Ángel. Phenology of Schizolobium parahyba and Vochysia guatemalensis in a tropical rain forest of Oaxaca, Mexico. Bot. sci [online]. 2012, vol.90, n.2, pp.185-193. ISSN 2007-4476.

Four phenological events (flowering, fruiting, leaf fall, and leaf flushing) were evaluated in Schizolobium parahyba (Vell.) Blake and Vochysia guatemalensis Donn.Smith., two tree species of the humid tropical forest in the north of Oaxaca, México, to relate with rainfall and air temperature during a year (September 2006-September 2007). In addition, soil moisture and tree water potential were measured by the end of drought (April-May 2007) and beginning of rainy season (June-July 2007). Results show that rainfall was significantly (P < 0.01) correlated with fruiting in both species (r = 0.89) and with leaf flush in S. parahyba (r = 0.88). The values of soil moisture (%) and tree water potential (bars) were: S. parahyba (8 to 25%, -11 to -1 bar) and V. guatemalensis (13 to 30%, -5.8 to -1.5 bar). The water stress was higher in some trees of S. parahyba than in all trees of V. guatemalensis. The phenology of S. parahyba was associated with climatic seasonality. The phenology of V. guatemalensis maybe determined by geographic and endogenous variables.

Keywords : climatic seasonality; flowering; fruiting; leaf fall; leaf flushing.

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