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Estoque e perda de necromassa da vegetação lenhosa em um gradiente fitofisionômico na transição Amazônia-Cerrado

Authors: Karla Monique Silva Carneiro; Simone Matias Reis; Paulo Sérgio Morandi; Fernando Elias; Edmar Almeida de Oliveira; Bem Hur Marimon-Junior; Beatriz Schwantes Marimon;

Estoque e perda de necromassa da vegetação lenhosa em um gradiente fitofisionômico na transição Amazônia-Cerrado

Abstract

Resumo A necromassa é um importante componente da decomposição e ciclagem de nutrientes nos ecossistemas naturais. Nosso objetivo foi avaliar o estoque e perda de necromassa da comunidade e das espécies em um gradiente fitofisionômico de cerrado típico, cerradão e floresta estacional semidecidual, na transição Amazônia-Cerrado. Calculamos, para cada fitofisionomia, o estoque de necromassa, por meio dos diâmetros dos indivíduos mortos em pé em 2005, 2008, 2011 e 2013. Também calculamos a perda de necromassa da comunidade e das espécies por meio dos diâmetros dos indivíduos que permaneceram mortos em pé entre, pelo menos, dois censos (2002-2005; 2005-2008; 2008-2011 ou 2011-2013). O cerrado típico apresentou estoque e perda de necromassa significativamente inferior ao cerradão e à floresta estacional. Ao nível de espécie, a taxa de decomposição de necromassa não apresentou correlação com a densidade da madeira. Maiores estoque e perda de necromassa na floresta estacional em relação ao cerrado típico podem estar relacionados ao maior porte dos indivíduos, que pode propiciar maior cobertura do dossel e microclima mais favorável à ação de organismos decompositores. Dessa forma, características intrínsecas de cada fitofisionomia podem estar relacionadas diretamente ao estoque e perda de necromassa em formações savânicas e florestais da transição Amazônia-Cerrado.

Keywords

decomposition, biomass, biomassa, QH301-705.5, carbon stock, Botany, nutrient cycling, wood density, densidade da madeira, estoque de carbono, QK1-989, decomposição, ciclagem de nutrientes, Biology (General)

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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