Relação hipsométrica e morfometria da copa para povoamento de Parapiptadenia rigida (Benth.) Brenan. em Dois Vizinhos, Paraná

Abstract

In order to determine and verify the behavior of the hypsometric relation and morphometric cup indices from Parapiptadenia rigida (Benth.) Brenan, in different diameter classes and different spacing. This study was conducted in southwestern Paraná-Brazil, in the city of Dois Vizinhos in a ten year old P. rigida planting, which has two different spacings: One with 2x2m between rows between plants and the other with 1,5x2m. Trees with circumference at breast height greater than 15cm were measured, and for each individual was determined: breast height (DBH), total height (h), crown insertion height (hic), crown height (hc), crown length (cc), crown radius (rc), crown diameter (dc), crown area (c), scope index (AI), boss index (IS), formal living room (FC), pep room (VC), distribution of branches (DG), trunk quality (QF), sociological position (PS) and in addition to these variables, for the trees in spacing 2, the lianas infestation was determined (IL). With the collected data, mathematical models were determined to describe the height, crown diameter and morphometric indices depending on the diameter at breast height for the entire population, and then for each diameter class and for each spacing. The data collected was processed using Microsoft Office Excel [marca registrada] software, Statistical Analysis System (SAS) version 9.2 and 7.6 beta Assistat. For the stand diameter description was used eight classes. The dendrometric variables, morphometric and qualitative differed in different diameter classes. It was noticed that the trees were very similar for both spacings when evaluated: diameter at breast height, total height, commercial height, crown diameter, breadth of content and projection index. In one hand, trees that have developed in spacing 1 invested more in length and proportion of canopy, on the other hand they had lower results for crown insertion height and formal canopy. The equations chosen to hypsometric relation and to describe the crown diameter depending on the diameter at breast height were: ln (hi) = 2.83601 to 5.26255. (1 / di) and DCI = 1.38216 + 0,24803.di. When stratifying the data by diameter class for models application improvements were not found in the statistical parameters compared to those established for the entire population. However to test the models for each spacing, it was noticed that the use of different equations depending on the spacing was beneficial to describe the height, crown diameter, crown length, proportion of canopy and boss index as a function of diameter at breast height. The methods of obtaining canopy becomes evident that they did not differ significantly from the method using eight spokes.