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Search Results: 1 - 10 of 6355 matches for " Mauro Valdir Schumacher "
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CARACTERIZA O MICROCLIMáTICA NO INTERIOR DOS TALH ES DE Eucalyptus camaldulensis Dehnh, Eucalyptus grandis Hill ex Maiden e Eucalyptus torelliana F. Muell, localizado em Anhambi, SP
Mauro Valdir Schumacher,Fabio Poggiani
Ciência Florestal , 2012,
Abstract: Neste estudo avaliou-se algumas características microclimáticas em talh es de Eucalyptus camaldulensis, Eucalyptus grandis e Eucalyptus torelliana, resultantes dos diferentes tipos de cobertura florestal que estas espécies propiciam. Das três espécies estudadas, Eucalyptus camaldulensis foi a que deixou passar as maiores quantidades de radia o solar global e intensidade luminosa. Já Eucalyptus torelliana foi a espécie que mais interceptou a radia o solar e deixou o sub-bosque com menos luminosidade. As maiores temperaturas diárias e nos primeiros 10 cm do solo, foram observadas em Eucalyptus camaldulensis. Para as três espécies, aos 20 cm de profundidade a varia o da temperatura foi praticamente constante. Através dos resultados encontrados foi possível confirmar que as árvores de Eucalyptus camaldulensis, Eucalyptus grandis e Eucalyptus torelliana, previamente estudadas na Austrália, pertencem, respectivamente, a forma o de floresta aberta baixa, floresta aberta alta e floresta fechada.
PRODU O DE BIOMASSA E REMO O DE NUTRIENTES EM POVOAMENTOS DE Eucalyptus camaldulensis Dehnh, Eucalyptus grandis Hill ex Maiden E Eucalyptus torelliana F. Muell, PLANTADOS EM ANHEMBí, SP
Mauro Valdir Schumacher,Fabio Poggiani
Ciência Florestal , 2012,
Abstract: Neste trabalho estudou-se a distribui o de biomassa e a quantidade de nutrientes estocados nos diferentes compartimentos (folhas, ramos, casca e lenho) das árvores de Eucalyptus camaldulensis Dehnh, Eucalyptus grandis Hill ex Maiden e Eucalyptus torelliana F. Muell com 9, 9 e 12 anos de idade, respectivamente, plantados em solos de textura arenosa e baixa fertilidade, em Anhembi, SP. A espécie Eucalyptus grandis foi a que apresentou a maior produ o de biomassa para todos os compartimentos analisados, com exce o dos ramos grossos. Nas três espécies o tronco (casca + lenho) representou em média 90% da biomassa acima do solo. Os nutrientes concentraram-se de forma decrescente nas folhas, ramos, casca e lenho. As copas das árvores foram responsáveis pelo acúmulo de, aproximadamente, 24% dos nutrientes contidos na biomassa total das árvores. Na casca encontram-se as maiores quantidades de cálcio, aproximadamente 60% do total. A espécie Eucalyptus grandis removeu do solo a maior quantidade de nutrientes, desenvolvendo através da queda de folhedo menores quantidades que as outras espécies. Desta forma cuidados especiais dever o ser dispensados para garantir a produtividade das rota es futuras.
Teores e aporte de nutrientes na serapilheira de Pinus taeda L., e sua rela??o com a temperatura do ar e pluviosidade
Viera, Márcio;Schumacher, Mauro Valdir;
Revista árvore , 2010, DOI: 10.1590/S0100-67622010000100010
Abstract: the objective of this study was to evaluate the contents and input of nutrients to forest floor in a pinus taeda l. stand and the relation with rainfall and air temperature, in an area previously occupied with native grass, in cambará do sul, rs, through litterfall, evaluated during a three-year period, from the 5th to the 7th year of the stand. litter was monthly collected in 1.0 m2 (1.0 x 1.0 m) collectors, from april/ 2004 to march/2007. after each collection, litter samples were chemically analyzed for macro and micronutrients. the contents of k, mg and cu showed a positive correlation (p < 0,05) with air temperature, while fe (p< 0.01), mn and zn (p < 0,05) showed a negative correlation with this climatic variable. the contents of n and k showed a negative correlation (p < 0.01 e p < 0,05, respectively). the contents of k, mg and cu showed a positive correlation (p < 0,05) with rainfall and the contents of s showed a positive correlation (p < 0,05) with air temperature, while the contents of fe (p < 0.01), mn and zn (p < 0,05) showed a negative correlation with this variable.the contents of n and k showed a negative correlation (p < 0.01 and p < 0,05, respectively) with litter amount monthly deposited. macronutrient mean annual input to soil, through litter deposition, in kg ha-1 was: 18.8 of ca; 13.0 of n; 3.0 of mg; 1.6 of k; 1.3 of s and 1.1 of p and for micronutrients the transference, in g ha-1 was: 4,708.3 of mn; 592.3 of fe; 74.1 of zn; 34.0 of b and 7.6 of cu. the results demonstrate the importantance of keeping the litter over the soil to maintain nutrient cycling.
Varia??o mensal da deposi??o de serapilheira em povoamento de Pinus taeda L. em área de campo nativo em Cambará do Sul-RS
Viera, Márcio;Schumacher, Mauro Valdir;
Revista árvore , 2010, DOI: 10.1590/S0100-67622010000300012
Abstract: this study had as its objective to evaluate the litter deposition in pinus taeda l. planted in native grass areas, during three years (5o to 7o year after forest planting), in cambará do sul, rs. four plots with 18 m x 50 m were randomly allocated and 20 litter collectors with 1 m2 were distributed in the plots (5 in each one). the litter was collected monthly between april /2004 and march/2007. after each collection, the litter was dried in an oven to determine the dried weight. the average annual litter deposition was 2,545.1 kg ha-1, with the following seasonal order: autumn > summer > winter > spring. the relative humidity was the only meteorological variable with significant correlation (r=0.365; p<0.05).
Biomass in monospecific and mixed stands of eucalyptus and black wattle and corn in an agroforestry system
Márcio Viera,Mauro Valdir Schumacher
CERNE , 2011,
Abstract: This study aimed at quantifying the production and distribution of aboveground biomass from the plants in monospecific and mixed stands of eucalyptus (hybrid E. urophylla x E. grandis) and black wattle (Acacia mearnsii) and, of corn (Zea mays) in agrosilvicultural systems. The biomass evaluation (leaf, branch, bark and wood) from the forest species at 6 and 18 months of age were performed at the treatments: 100E (100% of eucalyptus + corn); - 100A (100% of black wattle + corn); - 50E:50A (50% of eucalyptus + 50% of black wattle + corn). The corn biomass evaluation (stem, leaves, straw, cob and grains) was performed at treatments 100E; 100A; 50E:50A; 75E:25A (75% of eucalyptus + 25% of black wattle + corn); and - 25E:75A (25% of eucalyptus + 75% of black wattle + corn). The biomass production from eucalyptus and from the black wattle, in both monospecific and mixed planting, did not differ in any of the assessed ages but, when evaluated by plants compartments, it was verified an interspecific competitive interaction from the eucalyptus on the black wattle, reducing the formation of crown biomass. The total production of corn biomass in agrosilvicutural systems with eucalyptus and with black wattle in monospecific or mixed plantings did not differ in the studied treatments.
ESTIMATIVA DA BIOMASSA E DO CONTEúDO DE NUTRIENTES DE UM POVOAMENTO DE Eucalyptus globulus (Labillardière) SUB-ESPéCIE maidenii
Mauro Valdir Schumacher,Marcos Vinicius Winckler Caldeira
Ciência Florestal , 2000,
Abstract: O presente trabalho teve por objetivo estimar a produ o de biomassa acima do solo e determinar o conteúdo de nutrientes nos diferentes componentes das árvores de um povoamento de Eucalyptus globulus subespécie maidenii. Os dados foram coletados em um talh o de 4 anos de idade, plantado em solo argiloso, no município de Butiá, Rio Grande do Sul. Para determinar a quantidade de biomassa, foi utilizada uma equa o de regress o (lnY = a + b * lnX) cujos coeficientes foram calculados com base em nove árvores amostradas em diferentes classes diamétricas. A biomassa total acima do solo foi de 83,2 Mg ha-1, em que 13; 10; 9 e 68 % encontravam-se distribuídos nas folhas, ramos, casca e madeira, respectivamente. Do total dos elementos na árvore, na madeira do tronco foram encontrados 29; 29; 40; 12,5 e 34% de N, P, K, Ca e Mg respectivamente. Já na copa das árvores, esses mesmos elementos representaram 64; 56; 48,5; 32 e 39%. A casca foi o componente que acumulou as maiores quantidades de cálcio, (55,3% do total).
Crescimento e produtividade de povoamentos monoespecíficos e mistos de Eucalipto e Acácia-negra
Viera, Márcio;Schumacher, Mauro Valdir;Liberalesso, Edenilson;
Pesquisa Agropecuária Tropical , 2011, DOI: 10.5216/pat.v41i3.10760
Abstract: forest intercropping with nitrogen-fixing species can provide an increase in eucalyptus yield. the objective of this study was to evaluate growth and yield in monospecific and mixed stands of eucalyptus urograndis and acacia mearnsii, in bagé, rio grande do sul state, brazil. treatments were 100e (100% eucalyptus), 100a (100% black wattle), 50e:50a (50% eucalyptus + 50% black wattle), 75e:25a (75% eucalyptus + 25% black wattle), and 25e:75a (25% eucalyptus + 75% black wattle). the first evaluation was carried out at the age of 6 months (diameter at stem and total height) and the second at 18 months (diameter at breast height, total height, volume with bark, and leaf area index). the eucalyptus urograndis and acacia mearnsii diameter and total height growth, for both 6 and 18 months, did not differ among treatments. the total wood yield (m3 ha-1) was the same for cropping and intercropping, without any influence from other species. the mixed cropping system resulted in a greater number of individuals with higher diameters (μ + 1?), when compared to the cropping system, offering the forester an opportunity to obtain multiple products from his/her forest, due to a greater assortment provided by the presence of the two species.
Estimativa da biomassa e do comprimento de raízes finas em Eucalyptus urophylla S.T. Blake no município de Santa Maria-RS
Witschoreck, Rudi;Schumacher, Mauro Valdir;Caldeira, Marcos Vinicius Winckler;
Revista árvore , 2003, DOI: 10.1590/S0100-67622003000200008
Abstract: this study aimed to estimate the amount of biomass and the length of fine roots (< 2mm of diameter) in different soil depths for the 10 -year-old species eucalyptus urophylla s.t. blake. the experiment was conducted santa maria, rs on the campus of the federal university of santa maria. the plots were 27 m long and 14 m wide and 3 m x 2 spaced. four monoliths of 25 cm x 25 cm x 60 cm were sampled and divided into six geometric sections at depths of 0-10, 10-20, 20-30, 30-40, 40-50, 50-60 cm. roots were separated from the soil by using a set of two sieves (2 mm and 1 mm) and water jets. the intersection method was used to determine root length producing photos with the use of a scanner. the results showed a high concentration of fine roots in the first 20 cm of the soil. fine root total biomass found for eucalyptus urophylla was 1.451,6 kg/ha, 57.9% were concentrated in the first 20 cm of soil. the total length of fine roots was 27.968,9 km/ha, with 64.3% being in the first 20 cm of depth.
Influência de diferentes doses de fósforo no crescimento de mudas de angico-vermelho (Parapiptadenia rigida (Bentham) Brenan)
Schumacher, Mauro Valdir;Ceconi, Denise Ester;Santana, Cedinara Arruda;
Revista árvore , 2004, DOI: 10.1590/S0100-67622004000100019
Abstract: this experiment was conducted to study the effects of different phosphorus doses on the growth of angico-vermelho seedlings (parapiptadenia rigida). as substratum, red yellow argisol collected from a superficial layer (0-20 cm) was used and as additional fertilizers were added 10 mg/kg of n and 12.5 kg of k, whose sources were (nh4)2so4 and kcl. the experimental design was completely randomized with 8 treatments and 8 repetitions, totalizing 64 plots, with one plant per plot. the treatments consisted of: control (soil without phosphorus addition), 90, 180, 270, 360, 450, 540 and 630 mg kg of p (utilizing cahpo4 as salt). the recipients used were polypropylene vases with the capacity of 2.0 dm3. the humidity of the vases was kept at 80% of the field capacity. the following parameters were evaluated after 130 days: height of the aerial part, stem diameter, biomass above ground, root biomass and total biomass. the 450 mg/kg p dose resulted in the best growth of p. rigida plants.
Biomassa e nutrientes removidos no primeiro desbaste de um povoamento de Pinus taeda L. em Cambará do Sul, RS
Viera, Márcio;Schumacher, Mauro Valdir;Bonacina, Darlan Michel;
Revista árvore , 2011, DOI: 10.1590/S0100-67622011000300001
Abstract: the objective of this study was to quantify the biomass and removal of nutrients in the first thinning of pinus taeda stand at nine years of age in cambará do sul-rs. a forest inventory of the individuals that would be removed from the stand in the first thinning was done. the individuals were distributed in four diametric classes. three individuals in each class were cut off and needles, live branches, dead branches, bark from the commercial wood, commercial wood, bark from the top wood and top wood were separated. these components were sampled and analyzed for contents of macro and micronutrients. the biomass resulting from the first thinning was 35.7 mg ha-1, with the following magnitude distribution: commercial wood > live branches > bark in commercial wood > needles > top wood > dead branches > bark from the top wood. the needles presented the greatest concentration of macronutrients, which together with the bark from the top wood, also show the greatest amount of micronutrients. harvest of bark and commercial wood in the first thinning resulted in the following removal of macronutrients: 46.2 kg ha-1 of n, 25.1 kg ha-1 of ca, 15.2 kg ha-1 of k, 10.0 kg ha-1 of s, 6.7 kg ha-1 of mg and 5.4 kg ha-1 of p, and for micronutrients, the values were: 2,641 g ha-1 of mn, 1,026 g ha-1 of fe, 240 g ha-1 of zn, 234 g ha-1 of b and 66 g ha-1 of cu.
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