Produção de<i> Araucaria angustifolia</i> (Bert.) O. Ktze. na região do Planalto Médio do Estado do Rio Grande do Sul.

Abstract

RESUMONo presente trabalho foi estudada a produção de povoamentos de Araucaria angustifolia (Bert.) O. Ktze., na região do Planalto Médio do Estado do Rio Grande do Sul. Observou-se que a espécie apresenta uma variação muito grande de produção, representada por 7 índices de sítio, com intervalo de 2 metros de altura, dominante na idade de referência de 40 anos. Foram ajustadas funções para estimar a altura, diâmetro, fator de forma e número de árvores por hectare, o que permitiu a confecção das tabelas de produção que retratam a situação do povoamento remanescente, desbaste e a produção total. Palavras-chave: sítio; produção; Araucaria angustifolia. ABSTRACTThe present work studies the yield of Araucaria angustifolia (Bert.) O. Ktze. stands in the region of Planalto Medio of Rio Grande do Sul state. It has been observed that the variety shows a great variation of production, represented by 7 site index with a spacing of 2 meters of height at the age reference of 40 years. Functions have been adjusted for estimating the height, diameter, form factor and number of trees per hectare. This analysis has allowed the confection of production tables which gives a clear idea of the situation of the remaining stands, thinning and total production.

Araucaria Clonal Forestry: Types of Cuttings and Mother Tree Sex in Field Survival and Growth

“…In a study with the species, Schneider et al (1992) verified dominant height at 70 months of 2.7 and 5.5 m for the worst and best site in the same region, confirming the significant influence of soil properties on plantation efficiency. Thus, the low fertility of the local soil, mainly due to the low availability of P and K (Table 1), may have contributed to a growth in height less than the one recorded for the same species with similar ages.…”

“…year -1 at 36 months (CARVALHO, 2003). Slow growth is sustained by the natural conditions of species development, demanding when it comes to soil conditions, especially regarding depth (PUCHALSKI et al, 2006) and nutrient availability (CARVALHO, 2003;CARDOSO, 2002;SCHNEIDER et al, 1992).…”

“…However, reports to assess the behavior of plants produced by cuttings in the fi eld are inexistent and necessary, being available only assessments populations from seminal origin (CHASSOT et al, 2011;HESS et al, 2009;SCHNEIDER et al, 1992).…”

CLONAL FORESTRY OF Araucaria angustifolia: PLANTS PRODUCED BY GRAFTING AND CUTTINGS CAN BE USED FOR WOOD PRODUCTION1

“…In the present study, we observed that growth in height remained constant until 74 months, without evidence of growth spurts from third year after planting, regardless propagation method (Carvalho, 2003), and of 1.1 m year -1 (Machado et al, 2014), is possibly related to low site fertility of experimental area. This hypothesis is supported by the fact that Araucaria is a demanding species in relation to soil conditions, especially regarding depth (Puchalski et al, 2006) and nutrient availability (Golfari, 1971, Schneider et al;1992, Carvalho, 2003. In a study with the species, Schneider et al (1992) verified dominant height at 70 months of 2.7 and 5.5 m, respectively, for the worst and best site in the same region, confirming the significant influence of soil properties on the planting efficiency.…”

“…This hypothesis is supported by the fact that Araucaria is a demanding species in relation to soil conditions, especially regarding depth (Puchalski et al, 2006) and nutrient availability (Golfari, 1971, Schneider et al;1992, Carvalho, 2003. In a study with the species, Schneider et al (1992) verified dominant height at 70 months of 2.7 and 5.5 m, respectively, for the worst and best site in the same region, confirming the significant influence of soil properties on the planting efficiency. Thus, the low fertility of local site, mainly by low availability of P and K, may have contributed to a growth in height lower than the one recorded for this species with approximate ages.…”