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Dissertação
Distribuição das frações do carbono orgânico nos solos de florestas maduras na bacia Amazônica: o papel das propriedades do solo, da qualidade da liteira e do clima
Soil organic carbon (SOC) stability is a function of environmental and biological conditions such as edaphic factors, climate and organic matter quality. Considering that a wide variation occurs in all these parameters across Amazonia, one could expect that there should be systematic variations i...
Autor principal: | Paz, Claudia Pandolfo |
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Grau: | Dissertação |
Idioma: | por |
Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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Assuntos: | |
Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11965 http://lattes.cnpq.br/2807241147033707 |
Resumo: |
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Soil organic carbon (SOC) stability is a function of environmental and biological
conditions such as edaphic factors, climate and organic matter quality. Considering that a
wide variation occurs in all these parameters across Amazonia, one could expect that there
should be systematic variations in SOC fractions across the area. Understand the processes
involved in carbon stabilization in tropical pristine forests is very important to improve our
understanding of ecosystem function and to allow the preparation of better and more
accurate models of soil carbon dynamics. We used soil carbon fractionation techniques to
answer the following questions: (i) How the different soil carbon fractions are distributed
among the different soil types, at varying depths (ii) How they are inter-related and (iii) What
is the role of soil properties, climate and litter quality in modulating SOC fractions across the
Amazon Basin. This study was carried out on 30 1 hectare pristine rainforest plots located at
Brazil, Peru, Colombia and French Guyana. Our results show that SOC concentration in the
different fractions vary following a soil weathering gradient, where soil carbon on young,
more fertile soils is predominantly associated to relatively stable pools (silt+clay fraction)
while highly weathered soils such as Ferralsols and Acrisols have large proportion of their
soil carbon associated with stable aggregates. Very sandy and infertile soils have organic
matter mainly associated with the maintenance of particulate organic matter on soil surface,
which is clearly associated to poor organic matter quality and low decomposability.
Concentration of SOC on most fractions was found to be mainly associated to edaphic
properties, with the exception of the light fraction which is related to litter quality. We have
found little evidence of climate influence on SOC fractions. |