Análise de crescimento e mortalidade de Tabebuia aurea (Manso) Benth. & Hook e Tabebuia impetignosa (Mart. ex DC.) Standl no Cariri Paraibano.

Abstract

Tabebuia aurea (Manso) Benth. and Hook and Tabebuia impetiginosa (Mart. Ex DC.) Standl are species of high socioeconomic and environmental potential, therefore, information is needed on the production of seedlings of these species. The objective of this work was to analyze the growth and mortality of T. aurea and T. impetiginosa seedlings. The seeds were collected in December 2017 from an adult matrix in the municipality of Sumé. The work was carried out in the Laboratory of Ecology and Botany - LAEB/UFCG/CDSA under conditions of 50% shading in polyethylene trays, containing as substrate sand previously sieved and washed. Seeding was carried out on December 31, 2017. To follow the quantitative of individuals that emerged and mortality were counted daily and at 30 days of evaluation was carried out the growth in height with the aid of graduated rule. The emergence of T. aurea seedlings began on the eighth day after sowing and ceased on the twentyseventh day, totaling 88% of emergence. Regarding the emergence of T. impetiginosa, it was observed beginning on the fifth day after sowing, and ending on the fifteenth day. T. impetiginosa presented a higher number of dead individuals (4) than T. aurea that presented only one individual during the evaluation period. T. impetiginosa was distributed in a smaller quantitative height class in relation to T. aurea, thus assuming a more homogeneous pattern in this parameter of evaluation. Therefore knowledge of the emergence and development of these species become essential for regional sustainable development.