DIAGNOSIS OF THE FORESTS PLANTED IN RIVER BASIN OF \u2018PARDO\u2019 RIVER, RIO GRANDE DO SUL STATE

O presente estudo visa fazer um diagn\uf3stico das florestas plantadas na Bacia Hidrogr\ue1fica do Rio Pardo - RS, contemplando a caracteriza\ue7\ue3o das propriedades, dos florestamentos, e a disponibilidade e o consumo de madeira na regi\ue3o. A \ue1rea de abrang\ueancia do estudo fica na regi\ue3o central do Rio Grande do Sul, cuja economia principal \ue9 a fumicultura, abrangendo 13 munic\uedpios que comp\uf5em a \ue1rea de atua\ue7\ue3o do Comit\uea de Gerenciamento da Bacia Hidrogr\ue1fica do Rio Pardo. A coleta dos dados foi conduzida no decorrer do ano de 2008. Para a determina\ue7\ue3o do tamanho da amostra, foi feita uma amostragem com probabilidade proporcional ao tamanho, sendo que o crit\ue9rio de distribui\ue7\ue3o das unidades amostrais levou em considera\ue7\ue3o o n\ufamero de \ue1rvores por munic\uedpio e, dentro dos munic\uedpios, o n\ufamero de \ue1rvores por classe de tamanho de propriedade. O m\ue9todo de amostragem utilizado no invent\ue1rio florestal foi o de Prodan, al\ue9m de ter sido feitas entrevistas com os produtores. A regi\ue3o \ue9 caracterizada por pequenos produtores rurais, e 61,4% da lenha utilizada na cura das folhas de tabaco \ue9 adquirida de terceiros, al\ue9m disso, a maioria dos florestamentos possui espa\ue7amentos reduzidos (2,26 m\ub2/planta) e baixos \uedndices de sobreviv\ueancia, na ordem 34,4% ap\uf3s 7 anos do plantio. O estoque atual de madeira \ue9 de 2.781.069 m\ub3, o que garante um abastecimento para apenas 3,5 anos. Os dados levantados permitem constatar que os recursos necess\ue1rios para investir na autossufici\ueancia de lenha para a fumicultura, s\ue3o de R$ 12.250.000,00, que poderiam ser alocados anualmente, durante sete anos, equivalente \ue0 rota\ue7\ue3o em talhadia simples, resultando em uma \ue1rea de 80 ha/ano/munic\uedpio.The present study aims to make a diagnosis of the forests planted in the basin of \u2018Pardo\u2019 river (Rio Pardo), in RS state, by contemplating the characterization of properties, of forestations, and of the availability and consumption of wood in the region. The area of reach of the study is in the central region of Rio Grande do Sul state, which main economy is the tobacco crop, enclosing 13 cities that compose the performance area of the Management Committee of Rio Pardo Hydrographic Basin. The data collect were conducted during year 2008. In order to determine the size of the sample, it was made a sampling with its probability proportional to the size, where the criterion of the sample unity distribution took in consideration the numbers of trees per city and, inside the cities, the number of trees per class of property size. The sampling method utilized on the forest inventory was by Prodan, in addition to interviews taken with the producers. The region is characterized by small agricultural producers, and 61.4% of the firewood used in the cure of tobacco leaves is acquired from others, moreover, the majority of the forestation possess reduced spacing (2.26 m\ub2/plant) and low survival indices, in order of the 34.4% after 7 years of the plantation. The wooden current supply is of 2,781.069 m\ub3, what guarantees a supplying for only 3.5 years. The collected data allow to evidence that the resources necessary to invest in the self-sufficiency of firewood for the crop tobacco, are of R$ 12,250,000,00, that could be placed annually, during seven years, equivalent the rotation in simple coppice, resulting in an area of 80 ha/year/city