Productivity in clonal eucalyptus plantations depends on the genetic material and on the demand and cycling of nutrients, making studies that evaluate these requirements necessary. The aim of this study was to evaluate the effect of management (with and without thinning) on the deposition, chemical composition and nutrient contribution in litter at different clonal or stallion eucalyptus plantations. The experiment was conducted under a subdivided plot design for comparison of "clone" and "thinning" treatments. Plots were composed of eight different clonal and eucalyptus seed plantations, with subplots being areas where thinning was performed and areas without thinning. Litter deposition pattern associated to seasons was observed, with higher values in the spring and summer. The leaf fraction was more representative in relation to nutrients. Deposition values were close in most plantations. Nutritional contents were higher in leaves of areas with thinning in relation to the other areas.
Os micronutrientes são muito importantes na manutenção da fertilidade do solo, sendo sua deposição via serapilheira em Floresta Atlântica ainda pouco estudada. Esse trabalho objetivou avaliar a concentração e o aporte de micronutrientes na serapilheira depositada em áreas secundárias da Floresta Ombrófila Densa Submontana em Antonina, PR. A serapilheira foi coletada em três parcelas em diferentes estágios de sucessão secundária, separada em frações e folhas de espécies conhecidas, seca e pesada para realização das análises químicas de Cu, Mn, Fe e Zn. A ordem de concentração dos micronutrientes foi Mn > Fe > Cu > Zn, com teores de Mn e Fe relativamente altos. Entre as frações, houve grande variação nos teores de micronutrientes, sendo que a concentração de Cu foi maior nos ramos e miscelânea, o teor de Fe foi maior nas folhas e na miscelânea, o Mn foi superior nos ramos e o Zn foi maior nos ramos e folhas. Houve grande variação nos teores nas estações do ano, sem tendência definida. Os teores de Cu e Fe foram menores na FS-2, enquanto o Zn não apresentou tendência definida. O teor de Mn aumentou com o avanço da sucessão secundária, o que indica bioacumulação deste elemento no solo florestal. Palavras-chave: ciclagem de micronutrientes, Floresta Atlântica, serapilheira, sucessão florestal. Micronutrients in litter deposited in a successional gradient of Atlantic Rain Forest in Paraná state, Brazil ABSTRACT: Micronutrients are very important in the maintenance of soil fertility, and their deposition through litter in the Atlantic Forest is still little studied. This study aimed to evaluate the concentration and input of micronutrients by litterfall in secondary areas of Submontane Atlantic Rain Forest in Antonina, PR. The litter was collected in three plots at different stages of secondary succession, separated into fractions and leaves of selected species, dried and weighed to perform the chemical analysis of Cu, Mn, Fe and Zn. The concentration order of the micronutrients was Mn > Fe > Cu > Zn, with relatively high Mn and Fe contents. Among of litter fractions, there was a great variation in the micronutrient contents, where the concentration of Cu was higher in the branches and miscellaneous, the Fe content was higher in the leaves and in the miscellaneous, the Mn was superior in the branches and the Zn was higher in the branches and leaves. There was a great variation in the contents of the seasons of the year, with no defined trend. Cu and Fe contents were lower in FS-2, while Zn showed no particular trend. Mn content increased with forest sucession suggesting bioaccumulation of Mn in the forest soil.
Atributos microbiológicos do solo podem ser relacionados à ciclagem de nutrientes e mesmo com a produtividade de plantas e podem se relacionar com a fertilidade do solo ou com o potencial de desenvolvimento de determinadas espécies. O objetivo deste trabalho foi caracterizar atributos químicos e microbiológicos do solo em plantios com diferentes materiais genéticos de eucalipto, submetidos ou não ao desbaste florestal. O trabalho foi conduzido em área no município de Itatinga-SP, onde estão plantados oito clones e um plantio semental de eucalipto. As parcelas do experimento foram compostas pelos 8 clones e pelo plantio semental, sendo suas subparcelas as áreas em que foi realizado o desbaste e as áreas onde não foi realizado o desbaste. Foram realizadas coletas de solo para análises químicas e para os atributos microbiológicos nas camadas superficiais do solo. Não foi identificado efeito dos materiais genéticos sobre atributos químicos do solo. Foi observada tendência de maior atividade microbiológica no verão e não foi verificada influência do material genético sobre atributos microbiológicos, mas o desbaste influenciou alguns deles, sem, entretanto, comportamento padrão.Palavras-chave: microbiologia; clones; desbaste; microbiota do solo. CHEMICAL AND MICROBIOLOGICAL ATTRIBUTES OF THE SOIL IN CLONAL EUCALYPTUS PLANTATIONS ABSTRACT: Soil microbiological attributes can be related to nutrient cycling and even plant productivity and can be related to soil fertility or the development potential of certain species. The objective of this work was to characterize chemical and microbiological attributes of the soil in plantations with different genetic materials of eucalyptus, submitted or not to forest thinning. The work was carried out in an area in the municipality of Itatinga-SP, where eight clones and one eucalyptus seed plantation are planted. The experimental plots were composed of 8 clones and seed planting, with its subplots being the areas where thinning was carried out and the areas where thinning was not carried out. Soil collections were carried out for chemical analysis and microbiological attributes in the superficial layers of the soil. No effect of genetic materials on soil chemical attributes was identified. A trend towards greater microbiological activity was observed in the summer and there was no influence of genetic material on microbiological attributes, but thinning influenced some of them, without, however, standard behavior.Keywords: microbiology; clones; thinning; soil microbiota.
O objetivo geral deste trabalho foi estimar a quantidade de fitomassa e nutrientes estocada na serapilheira acumulada e taxas de decomposição da serapilheira acumulada ao longo do ano em plantios com diferentes materiais genéticos de eucalipto, em áreas submetidas ou não ao desbaste florestal. O trabalho foi conduzido em Itatinga-SP. O experimento foi um delineamento de parcelas subdivididas. As parcelas foram compostas por 8 clones e um plantio semental, sendo subparcelas áreas em que foi realizado o desbaste e áreas sem desbaste. Para estimativa da serapilheira acumulada foram realizadas coletas em cada estação do ano, entre junho de 2015 e março de 2016. Após as avaliações concluiu-se que existiu um padrão de acúmulo de serapilheira associado às estações, com maiores valores na primavera e verão. A fração folhas foi a mais representativa quanto à quantidade de serapilheira acumulada no solo. Os valores de acúmulo total de serapilheira variaram pouco entre os materiais genéticos avaliados. A decomposição foi ligeiramente maior nas áreas desbastadas comparativamente às áreas sem desbaste. A sequência decrescente dos teores nas frações foi: Folhas > Galhos > Casca > Órgãos reprodutivos > Outros materiais. Quanto aos elementos a sequência foi: N > Ca > Mg > K > P.Palavras-chave: biogeoquímica florestal, serapilheira acumulada, desbaste, decomposição. DYNAMICS OF LITTER STOCK AND NUTRIENTS UNDER CLONAL EUCALYPTUS PLANTATIONS ABSTRACT: The objectives of this work were: to estimate the amount of phytomass and nutrients stored in the accumulated litter; to evaluate the seasonal variability of the amount of phytomass and nutrients in the accumulated litter and to estimate the decomposition rates of accumulated litter throughout the year. The work was conducted in Itatinga-SP. The experiment was an outline of subdivided plots. The plots were composed of 8 clones and one stallion planting, being subplots areas where thinning and non - roughing areas were performed. In order to estimate the accumulated litter, collections were made in each season of the year, between June 2015 and June 2016. After the evaluations it was concluded that there was a pattern of litter accumulation associated with the seasons, with higher values in spring and summer. The most representative leaf fraction was the amount of litter accumulated on the soil. Values of total litter accumulation were close between genetic materials. The decomposition was slightly higher in the thinned areas compared to the thinned areas. The decreasing sequence of the contents in the fractions was: Leaves> Branches> Bark> Other materials> Vegetable remains. As for the elements the sequence was: N> Ca> Mg> K> P.Keywords: forest biogeochemistry, litter stock, thinning, decomposition.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.