Dissertação

Dinâmica de nutrientes em florestas secundárias de terra firme na Amazônia Central

Second growth, even when substantially different from the original forests in terms of floristics, plays important ecological functions, restoring some of the most important benefits to the system. This study aimed to determine the effects of differences in vegetation cover on the nutritional qua...

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Autor principal: Oliveira, Fabiane Lima de
Grau: Dissertação
Idioma: por
Publicado em: Instituto Nacional de Pesquisas da Amazônia - INPA 2020
Assuntos:
Solos florestais
Nutrientes
Liteira
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/11973
http://lattes.cnpq.br/3768334375801220
id oai:repositorio:1-11973
recordtype dspace
spelling oai:repositorio:1-11973 Dinâmica de nutrientes em florestas secundárias de terra firme na Amazônia Central Oliveira, Fabiane Lima de Luizão, Regina C. C. Luizão, Flavio J. Solos florestais Nutrientes Liteira Second growth, even when substantially different from the original forests in terms of floristics, plays important ecological functions, restoring some of the most important benefits to the system. This study aimed to determine the effects of differences in vegetation cover on the nutritional quality of litter and soil and recycling of nutrients. so samples were taken from soil, newly fallen litter and the litter-layer accumulated on the ground, in the PDBFF in BR 174, about 80 km north of Manaus. Three plots were sampled for each of the types of vegetation considered: ongoing pasture active, post-pasture second growth, post-harvest second growth, post-seringa second growth and primary forest. It was found that although the soil under pastures has higher concentrations of active organic matter and nutrients (K, Ca and Mg), the very low input of nutrients, especially nitrogen and basic cations provided by the litterfall into the system is leading it to the nutrient exhaustion in a short term period. In general and for the variable under study, the second growth vegetations in this study, all with more than 17 years of regeneration, are in such an advanced stage of secondary succession that masked any influences that either type of system or management might have had in the past. By the level of their recovery and function it was shown that those second growth surrounding the forest fragments are providing an important environmental service not only to recover biomass plant, restructuring the forest landscape and important ecological functions, but also in the recovery of the recycling of nutrients in soil including fixing carbon. 3 As florestas secundárias, mesmo substancialmente diferentes das florestas originais em termos de composição de espécies, desempenham importantes funções ecológicas, restaurando alguns dos mais importantes benefícios ao funcionamento do sistema como um todo. Este estudo pretendeu analisar os efeitos das diferenças na cobertura vegetal, sob a qualidade nutricional da liteira e do solo para a ciclagem dos nutrientes. Para isso foram realizadas coletas da camada superficial do solo, liteira recém-caída e liteira acumulada sobre o solo em vários sistemas, com diferentes tipos de cobertura vegetal. Foram amostradas três parcelas para cada um dos tipos de cobertura vegetal considerados: Pastagem ativa, capoeira pós-pastagem, capoeira pós-corte, capoeira pós-seringa e floresta primária todas localizadas nas áreas de estudo do PDBFF a 80 km ao Norte da cidade de Manaus. Constatou-se que embora os solos das pastagens ativas apresentassem concentrações elevadas de matéria orgânica e nutrientes como o K, Ca e Mg, o baixíssimo aporte de nutrientes, em especial N e cátions básicos providos pela liteira recém-caída tenderiam a levar o sistema à exaustão em curto prazo. Em geral as capoeiras estudadas se encontram em avançado estádio de sucessão secundária e após mais de 17 anos de regeneração, e para as variáveis estudadas, o tempo foi suficiente para ofuscar influências do tipo de sistema ou manejo a que estas áreas tenham sido submetidas no passado. Foi evidenciado que as capoeiras são funcionalmente importantes, não apenas por recuperarem a biomassa vegetal destas áreas outrora degradadas, e restaurarem em parte a fitofisionomia da paisagem, mas também para a recomposição da ciclagem de nutrientes, incluindo a fixação do Carbono. 2020-02-17T18:03:44Z 2020-02-17T18:03:44Z 2009-07-17 Dissertação https://repositorio.inpa.gov.br/handle/1/11973 http://lattes.cnpq.br/3768334375801220 por Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Instituto Nacional de Pesquisas da Amazônia - INPA Ecologia
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language por
topic Solos florestais
Nutrientes
Liteira
spellingShingle Solos florestais
Nutrientes
Liteira
Oliveira, Fabiane Lima de
Dinâmica de nutrientes em florestas secundárias de terra firme na Amazônia Central
topic_facet Solos florestais
Nutrientes
Liteira
description Second growth, even when substantially different from the original forests in terms of floristics, plays important ecological functions, restoring some of the most important benefits to the system. This study aimed to determine the effects of differences in vegetation cover on the nutritional quality of litter and soil and recycling of nutrients. so samples were taken from soil, newly fallen litter and the litter-layer accumulated on the ground, in the PDBFF in BR 174, about 80 km north of Manaus. Three plots were sampled for each of the types of vegetation considered: ongoing pasture active, post-pasture second growth, post-harvest second growth, post-seringa second growth and primary forest. It was found that although the soil under pastures has higher concentrations of active organic matter and nutrients (K, Ca and Mg), the very low input of nutrients, especially nitrogen and basic cations provided by the litterfall into the system is leading it to the nutrient exhaustion in a short term period. In general and for the variable under study, the second growth vegetations in this study, all with more than 17 years of regeneration, are in such an advanced stage of secondary succession that masked any influences that either type of system or management might have had in the past. By the level of their recovery and function it was shown that those second growth surrounding the forest fragments are providing an important environmental service not only to recover biomass plant, restructuring the forest landscape and important ecological functions, but also in the recovery of the recycling of nutrients in soil including fixing carbon. 3
author_additional Luizão, Regina C. C.
author_additionalStr Luizão, Regina C. C.
format Dissertação
author Oliveira, Fabiane Lima de
title Dinâmica de nutrientes em florestas secundárias de terra firme na Amazônia Central
title_short Dinâmica de nutrientes em florestas secundárias de terra firme na Amazônia Central
title_full Dinâmica de nutrientes em florestas secundárias de terra firme na Amazônia Central
title_fullStr Dinâmica de nutrientes em florestas secundárias de terra firme na Amazônia Central
title_full_unstemmed Dinâmica de nutrientes em florestas secundárias de terra firme na Amazônia Central
title_sort dinâmica de nutrientes em florestas secundárias de terra firme na amazônia central
publisher Instituto Nacional de Pesquisas da Amazônia - INPA
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/11973
http://lattes.cnpq.br/3768334375801220
_version_ 1787141281144635392
score 11.755432

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