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Distribuição Do Carbono Orgânico Nas Frações Do Solo Em Diferentes Ecossistemas Na Amazônia Central
Authors
Amelung W
Araújo EA
+56 more
Awiti AO
Bayer C
Campos DV
Cardoso EL
Carvalho JLN
Cerri CEP
Cheng L
Conceição PC
Costa OV
De Bona FD
Desjardins T
Elizalane Moura de Araújo Marques
Feldpausch TR
Flávio Jesus Luizão
Freixo AA
Froufe LCM
Frouz J
Galvinelli E
Huang Z
Ingram JSI
Jean Dalmo de Oliveira Marques
John B
Lal R
Luizão FJ
Maia SMF
Marchão RL
Marin-Spiota E
Marques JD
Marques JD
Martens DA
Max Sarrazin
McGrath DA
Mutuo PK
Oelbermann M
Passos RR
Paul S
Pillon CN
Pinheiro EFM
Rangel OJ
Roscoe R
Roscoe R
Sanchez PA
Silva JE
Silva ML
Sisti CPJ
Soares R
Sohi S
Solomon D
Souza ED
Stürmer SLK
Sávio José Filgueira Ferreira
Tapia-Coral SC
Troy Patrick Beldini
Von Lützow M
Wenceslau Geraldes Teixeira
Yamashita T
Publication date
1 January 2015
Publisher
'FapUNIFESP (SciELO)'
Doi
Cite
Abstract
Organic matter plays an important role in many soil properties, and for that reason it is necessary to identify management systems which maintain or increase its concentrations. The aim of the present study was to determine the quality and quantity of organic C in different compartments of the soil fraction in different Amazonian ecosystems. The soil organic matter (FSOM) was fractionated and soil C stocks were estimated in primary forest (PF), pasture (P), secondary succession (SS) and an agroforestry system (AFS). Samples were collected at the depths 0-5, 5-10, 10-20, 20-40, 40-60, 60-80, 80-100, 100-160, and 160-200 cm. Densimetric and particle size analysis methods were used for FSOM, obtaining the following fractions: FLF (free light fraction), IALF (intra-aggregate light fraction), F-sand (sand fraction), F-clay (clay fraction) and F-silt (silt fraction). The 0-5 cm layer contains 60% of soil C, which is associated with the FLF. The F-clay was responsible for 70% of C retained in the 0-200 cm depth. There was a 12.7 g kg-1 C gain in the FLF from PF to SS, and a 4.4 g kg-1 C gain from PF to AFS, showing that SS and AFS areas recover soil organic C, constituting feasible C-recovery alternatives for degraded and intensively farmed soils in Amazonia. The greatest total stocks of carbon in soil fractions were, in decreasing order: (101.3 Mg ha-1 of C - AFS) > (98.4 Mg ha-1 of C - FP) > (92.9 Mg ha-1 of C - SS) > (64.0 Mg ha-1 of C - P). The forms of land use in the Amazon influence C distribution in soil fractions, resulting in short- or long-term changes. © 2015, Revista Brasileira de Ciencia do Solo. All rights reserved
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