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dc.contributor.authorBarros, Henrique Seixas-
dc.contributor.authorFearnside, Philip Martin-
dc.description.abstractWarming climate can cause release of carbon stocks in soils, but direct observations in tropical soils have been lacking. A unique data set from a study near Manaus, Brazil, allows comparison of samples taken before and after a ∼28-yr period in 176 plots in undisturbed forest (i.e., intact forest with no visible sign of modern human action and >100 m from a forest edge, with 98% of the plots being >300 m from an edge). The data indicate a significant loss of carbon in the top 20 cm of soil (2.98 MgC ha-1 over 28 yr, an average of 0.11 Mg ha-1 yr-1, or 0.3828% yr-1 of the carbon stock). Carbon emissions would be substantial if the pattern for the top 20 cm at this location holds throughout Amazonia, and the implications are huge if the same pattern holds for the deeper soil layers. Release of soil carbon can contribute to a positive feedback, where emissions cause greater warming that further augments the emissions. © 2019 The Author(s). Re-use requires permission from the publisheren
dc.relation.ispartofVolume 83, Número 6, Pags. 1779-1785pt_BR
dc.subjectMagnesium Compoundsen
dc.subjectAmazonian Forestsen
dc.subjectCarbon Emissionsen
dc.subjectCarbon Stocksen
dc.subjectDirect Observationsen
dc.subjectHuman Actionsen
dc.subjectTropical Soilsen
dc.subjectUndisturbed Forestsen
dc.subjectWarming Climateen
dc.subjectCarbon Emissionen
dc.subjectCarbon Sequestrationen
dc.subjectForest Soilen
dc.subjectSoil Carbonen
dc.subjectTropical Soilsen
dc.titleSoil Carbon is Decreasing under “Undisturbed” Amazonian Foresten
dc.publisher.journalSoil Science Society of America Journalpt_BR
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