Resumo

CALLEJAS-CHAVERO, Alicia; PEREZ-VELAZQUEZ, Daniela; PALACIOS-VARGAS, José G.  e  CASTANO-MENESES, Gabriela. Growth and leaves production of Pittocaulon praecox (Asteraceae) from two contrasting sites in a xerophytic shrubland in Mexico. Caldasia [online]. 2020, vol.42, n.2, pp.330-332. ISSN 0366-5232.  https://doi.org/10.15446/caldasia.v42n2.73059.

The effect of vegetal cover on growth and leaves production of Pittocaulon praecox in two contrasting sites, close and open, in a xerophytic shrub was evaluated. In each site length, number of leaves, total growth, soil temperature, humidity, CO2 concentration and litter production were recorded. Data were analyzed by Repeated Measures Analysis of Variance and a t test. The low temperature (20.79 ± 2.8 °C), higher CO2 concentration (169.10 ± 12.19) and humidity (40.13 ± 8.26) were recorded in the close site were shrubs are taller (t118 = 3.83, P = 0.0002) and produce more leaves (86.21 ± 43.31 gr). The vegetal cover has an important effect on growth and leaves production of Pittocaulon praecox in the studied area.

Palavras-chave : Abiotic factors; biomass; biotic factors; phenology; plant cover.

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