From forest to cropland and pasture systems: a critical review of soil organic carbon stocks changes in Amazonia

Global Change Biology
Kenji FujisakiMichel Brossard

Abstract

The impact of deforestation on soil organic carbon (SOC) stocks is important in the context of climate change and agricultural soil use. Trends of SOC stock changes after agroecosystem establishment vary according to the spatial scale considered, and factors explaining these trends may differ sometimes according to meta-analyses. We have reviewed the knowledge about changes in SOC stocks in Amazonia after the establishment of pasture or cropland, sought relationships between observed changes and soil, climatic variables and management practices, and synthesized the δ(13) C measured in pastures. Our dataset consisted of 21 studies mostly synchronic, across 52 sites (Brazil, Colombia, French Guiana, Suriname), totalling 70 forest-agroecosystem comparisons. We found that pastures (n = 52, mean age = 17.6 years) had slightly higher SOC stocks than forest (+6.8 ± 3.1 %), whereas croplands (n = 18, mean age = 8.7 years) had lower SOC stocks than forest (-8.5 ± 2.9 %). Annual precipitation and SOC stocks under forest had no effect on the SOC changes in the agroecosystems. For croplands, we found a lower SOC loss than other meta-analyses, but the short time period after deforestation here could have reduced this loss. There was no clea...Continue Reading

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Citations

Oct 27, 2016·Global Change Biology·Matthias BaumannTobias Kuemmerle
Dec 15, 2016·Global Change Biology·Clément StahlVincent Blanfort
Jun 9, 2020·Ecological Applications : a Publication of the Ecological Society of America·Jonathan G WynnLindsay B Hutley
Aug 23, 2017·Proceedings of the National Academy of Sciences of the United States of America·Jonathan SandermanGregory J Fiske
Jun 26, 2018·Journal of Geophysical Research. Biogeosciences·R Chelsea NagySusan Trumbore
Nov 22, 2018·Environmental Science and Pollution Research International·Renhuan ZhuTao Liu
Dec 14, 2018·Nature·Timothy D SearchingerPatrice Dumas

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