Comportamento inicial de P. oocarpa e três variedades de P. caribaea, introduzidos na região litorânea do Estado da Paraíba.

Abstract

The present work was carried out from an experiment located in Alhandra, Paraíba-Brasil. With the objective of evaluating the initial behavior of tropical Pinus species, introduced in the coastal region of the State of Paraíba. The experiment was implemented on 08/10/77, with the following species: Pinus patula, P. kesiya, P. oocarpa, p. caribaea var. caribaea, P. caribaea var. bahamensis. The species were planted without any type of fertilization and in 2 spacings, that is, 3x1.5m. and 3x2m. After 2 years the species of P. patula and P. kesiya died completely and P. kesiya was replaced by P. caribaea var. honduransis. Height, DBH and % survival data were collected on 01/09/90. 40 plants/plot (3x1.5m.), and 28 plants/plot (3x2m.) were measured. The height and DBH data were transformed into volume/plot (m³), volume into m³/ha and IMA into m³/ha. For analysis, statistical tests were applied. Breast I analyzed it was observed that the greatest survival was for P. caribaea var. hondurensis with 97!/$ (3x1.5m.), and the species that survived the least were P. oocarpa (3x1.5m.) and P. caribaea var. hondurensis (3x2m.), both with 94% survival. In terms of volume, P. o ocarpa was the species that most developed, presenting 540.88 m³/ha (3x1.5m.), followed by P. caribaea vcr. caribaea with 489.59 m³/ha (3x2m.), the species that grew the least volumetrically was P. caribaea var. hondurensis, yielding 301.60m³/ha (3x2m.), despite being 2 years younger than the other species. In terms of increment, it can be considered that the average productivity of the species tested was good, when compared with their regions of origin and other regions tested by them. Considering the variables: height, DBH and form factor, a good adaptation of the 4 species studied in the coastal region of the State of Paraíba was evidenced.