INFLUENCE OF DIAPHRAGM IN THE PRESERVATIVE TREATMENT OF TWO BAMBOO SPECIES BY SAP DISPLACEMENT METHOD

Abstract

Esta pesquisa teve como objetivo avaliar a influ\ueancia da remo\ue7\ue3o do diafragma na qualidade do tratamento preservativo de colmos de bambu das esp\ue9cies Dendrocalamus giganteus e Bambusa vulgaris submetidos aom\ue9todo de substitui\ue7\ue3o de seiva. Os bambus foram colhidos em touceiras em Alegre e Jer\uf4nimo Monteiro, Sul do Esp\uedrito Santo. As hastes foram secionadas em colmos de 2,0 m de comprimento. Uma parte dos colmos teve o diafragma removido, enquanto na outra foram mantidos intactos. Os colmos foram tratados em solu\ue7\uf5es de 1 e 3% de ingredientes ativos (i.a.) de borato de cobre cromatado (CCB). Os colmos foram mantidos na solu\ue7\ue3o por 5, 10 e 15 dias. Foi avaliada a qualidade do tratamento preservativo por meio da penetra\ue7\ue3o e da reten\ue7\ue3o do CCB nos colmos. Houve maior penetra\ue7\ue3o de cobre e boro na base dos colmos, a remo\ue7\ue3o do diafragma proporcionou maior movimenta\ue7\ue3o da solu\ue7\ue3o nos colmos e a reten\ue7\ue3o obtida ficou, para a maioria das condi\ue7\uf5es testadas, abaixo daquela recomendada pelas normas brasileiras para o tratamento preservativo da madeira.This research aimed to evaluate the influence of removing the diaphragm on the quality of the preservative treatment of bamboo culms of Dendrocalamus giganteus and Bambusa vulgaris submitted to sap displacement method. The bamboos were collected in clumps in Alegre and Jer\uf4nimo Monteiro, south of Esp\uedrito Santo state, Brazil. The stems were sectioned in culms of 2.0 m in length. One part of the culms had the diaphragm removed while in the other they were kept unbroken. The culms were treated in soutions of 1% and 3% of active ingredients (a.i.) of copper, chromated copper borate (CCB). The culms were kept in the solution for 5, 10 and 15 days. The preservative treatment quality was evaluated by means of penetration and retention of CCB in culms. There was greater penetration of copper and boron at the base of the culms, the removing of the diaphragm provided greater movement of the solution in the culms and the retention was, for most treatment conditions, below than the one recommended by Brazilian standards for wood preservative treatment