Comparison of two thinning systems in plantations of tectona grandis l.f. In the nicoya peninsula, costa rica
| Autor: | Chaves Salas, Eladio, Chinchilla Mora, Orlando, Mora Chacón, Fernando |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Raleo
Revistas Geografía Facultad de Ciencias Forestales y Ambientales Manejo de plantaciones Artículos [Revista Forestal Venezolana] Plantaciones forestales Forest plantations Growth Crecimiento Area basal Basal area Medio Ambiente Universidad de Los Andes Revista Forestal Venezolana Plantation management Thinning Teak |
| Popis: | Se detectaron diferencias significativas, en el primero y el segundo aclareo en plantaciones de 7 y 12 años, en la plantación de Cabuya entre los tratamientos de aclareo y el testigo, pero el tercer aclareo realizado a los 21 años, no presentó diferencias significativas. Los aclareos realizados en Puerto Carrillo, que dejó 500 árboles/ha a los seis años, mostraron un mayor crecimiento diamétrico que los realizados tomando en cuenta el área basal, en sitios de similar calidad. Las altas densidades a temprana edad afectan el crecimiento en diámetro, altura y hasta la productividad del sitio. Las plantaciones de teca en la península de Nicoya, se clasificaron entre los índices de sitio 23 y 27, con una edad clave de 16 años, estas plantaciones se consideran como sitios de clase media y alta, de acuerdo al crecimiento exhibido por la teca en Costa Rica. Results are presented of two thinning experiment carried out with different goals in teak plantations (Tectona grandis L.f.), in two sites, at the Nicoya Peninsula: Puerto Carillo with 10 years of records and Cabuya with 23 years of research. Strong early thinnings, were done, based on the number of trees in intensively managed plantations with a shorter rotation and lighter thinning using basal area as a parameter, in the longer rotation plantations. A completely randomized block design with two replication was using. Thinnings were done at 7, 12 and 21 years in Cabuya and at 5, 6, and 10 years in Puerto Carrillo. Significant differences were detected in the first and the second thinning at the ages of 7 and 12, at Cabuya plantation, between the different thinning treatments and the control plot, but the third thinning done at 21 years of age, the differences were not significant. The thinning carried out at Puerto Carrillo, taking as a reference the number of trees, in order to leave 500 trees/ha at the age of 6, showed a superior growth in diameter that those carried out taking into account the basal area, in sites of similar quality. The high densities at early ages affect the growth in diameter and height, and also affect stand productivity. The teak plantations at the Nicoya Peninsula, classified among site indexes of 23 and 27, with a 16 yearold base age, and are considered as middle class and high class sites, according to the growth exhibited by teak in Costa Rica. 131-145 echaves1@ice.co.cr Semestral |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|