Anna Paula Lora Zimmermann

DENSITY MANAGEMENT DIAGRAMS FOR STANDS OF Eucalyptus grandis W. Hill RS, BRAZIL

1 Received on 10.04.2014 accepted for publication on 27.10.2016. 2 Universidade Federal de Alagoas, Centro de Ciências Agrárias, Rio Largo, AL Brasil. E-mail: <gabrimarangon@hotmail.com>. 3 Universidade Federal de Santa Maria, Centro de Ciências Rurais, Departamento de Ciências Florestais, Santa Maria, RS Brasil. E-mail: <paulors@smail.ufsm.br>. 4 Universidade Federal de Santa Maria, Programa de Pós-Graduação em Engenharia Florestal, Santa Maria, RS Brasil. E-mail: <zimmermann-a@hotmail.com>, <regislonghi@yahoo.com.br> and <jeancavalli@hotmail.com>. *Corresponding author.

USING BARE-ROOT AND ROOTSTOCK SEEDLINGS FROM NATURAL REGENERATION OF CEDRELA FISSILIS

The success of forest creation relies on seedling availability and quality. The aim of this research is to assess the possible use of rootstock and bare-root seedlings of Cedrela fissilis obtained from natural regeneration for direct field planting. We used Generalized Linear models to assess survival and Hierarchical Models to assess height growth over one year after planting. Initial root-collar diameter (RCD) and treatment (rootstock or bare-root) affected survival and growth. Rootstock and larger seedlings presented higher levels of survival and growth. Higher seedling quality in the rootstock treatment is due to higher water stress tolerance. Rootstock seedlings with more than 1 cm of initial RCD had over 80% of survival probability, while small bare-root seedlings had mean survival probability as low as 20%. Rootstock seedlings grew as much as fourfold more than bare-root. Using natural regeneration of C. fissilis as a source of rootstock seedlings may be a cheap alternative for forest restoration and enrichment planting projects.

DINÂMICA DO USO E COBERTURA DO SOLO NO VALE DO RIO PARDO, RIO GRANDE DO SUL

Os objetivos deste trabalho sao determinar taxas de desmatamento e regeneracao reais no periodo entre 1990 e 2014 e estimar mapas de uso e cobertura do solo para o ano de 2018 na regiao do Vale do Rio Pardo. Foram utilizadas imagens Landsat para a classificacao do uso e cobertura do solo e o programa Dinamica EGO foi utilizado para determinar transicoes reais e estimadas entre as diferentes classes de uso do solo. A area florestal aumentou constantemente a uma taxa de 0,58% ao ano. No entanto, as taxas de desmatamento e regeneracao sao maiores, entre 3 e 6%. O modelo desenvolvido gerou estimativas consistentes ao longo do periodo estudado. O mapa de uso do solo estimado para 2018 indica regioes suscetiveis ao desmatamento que devem ser melhor observadas pelos orgaos de fiscalizacao.

INFLUÊNCIA DE MÉTODOS DE COLETA DE DADOS ESPECTRORRADIOMÉTRICOS SOB ÍNDICES DE VEGETAÇÃO EM EUCALIPTO

Objetivou-se verificar a influencia de metodos de coleta de folhas em indices de vegetacao: posicao de coleta na copa, orientacao cardeal e estacao do ano em Eucalyptus grandis . Os dados foram coletados em dois povoamentos distintos em duas arvores dominantes cada. Foram coletadas 15 folhas em cada posicao e em cada orientacao, acrescidas de uma amostra de mesmo tamanho no centro. A coleta foi realizada em um unico dia, das 13:00 as 15:00 horas. O material foi analisado com o espectrorradiometro FieldSpec®3 e a resposta espectral de cada orientacao e posicao foi dada pela media da leitura espectral das folhas. Foram analisados 60 diferentes indices de vegetacao de acordo com a literatura. Para avaliar o efeito da estacao sobre os indices foram realizadas coletas nas quatro estacoes do ano, configurando 4 tratamentos. Foram utilizados modelos mistos para analisar a influencia nos fatores (posicao e estacao) e sua interacao. Os dados foram considerados aninhados em cada orientacao, dentro de cada arvore e de cada area. A analise estatistica foi realizada no software R com o pacote nlme. Dos indices de vegetacao analisados, seis apresentaram dependencia da posicao/orientacao e estacao de coleta, sendo necessario em posteriores estudos a obediencia de suas dependencias.

Determinação da Distância de Dispersão Efetiva de Cabralea canjerana

This study aimed to know the effective dispersal distance of Cabralea canjerana (Vell.) Mart. in a forest fragment. Plots of 5 × 5 m were allocated in an area with high density of regenerating individuals of the species. Individuals higher than 30 cm and with diameter at breast height (DBH) smaller than 15 cm were recorded and referenced in pseudo-coordinates. Individuals with DBH greater than 15 cm were considered as seed producers. The dispersal distance was calculated using the methodology by Nathan & Muller-Landau (2000); two distances were calculated: the distance of each individual in relation to the nearest adult tree, and the average distance between all matrix trees. The effective dispersal peak occurs at a mean distance of 30 meters from the mother trees. Three seed producing individuals per hectare are needed to ensure the continuous regeneration of the species.

Determinação da Distância de Dispersão Efetiva de Cabralea canjerana / Determination of the Effective Dispersal Distance of Cabralea canjerana

This study aimed to know the effective dispersal distance of Cabralea canjerana (Vell.) Mart. in a forest fragment. Plots of 5 × 5 m were allocated in an area with high density of regenerating individuals of the species. Individuals higher than 30 cm and with diameter at breast height (DBH) smaller than 15 cm were recorded and referenced in pseudo-coordinates. Individuals with DBH greater than 15 cm were considered as seed producers. The dispersal distance was calculated using the methodology by Nathan & Muller-Landau (2000); two distances were calculated: the distance of each individual in relation to the nearest adult tree, and the average distance between all matrix trees. The effective dispersal peak occurs at a mean distance of 30 meters from the mother trees. Three seed producing individuals per hectare are needed to ensure the continuous regeneration of the species.