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Title: Soil Carbon is Decreasing under “Undisturbed” Amazonian Forest
Authors: Barros, Henrique Seixas
Fearnside, Philip Martin
Keywords: Carbon
Magnesium Compounds
Amazonian Forests
Carbon Emissions
Carbon Stocks
Direct Observations
Human Actions
Tropical Soils
Undisturbed Forests
Warming Climate
Carbon Emission
Carbon Sequestration
Forest Soil
Soil Carbon
Tropical Soils
Issue Date: 2019
metadata.dc.publisher.journal: Soil Science Society of America Journal
metadata.dc.relation.ispartof: Volume 83, Número 6, Pags. 1779-1785
Abstract: Warming 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 publisher
metadata.dc.identifier.doi: 10.2136/sssaj2018.12.0489
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