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Title

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

Publication Year

2015

Author(s)
  • Fujisaki, Kenji
  • Perrin, Anne-Sophie
  • Desjardins, Thierry
  • Bernoux, Martial
  • Balbino, Luiz Carlos
  • Brossard, Michel
Source
GLOBAL CHANGE BIOLOGY Volume: 21 Issue: 7 Pages: 2773-2786 Published: 2015
ISSN
1354-1013 eISSN: 1365-2486
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 C-13 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 = 17.6years) had slightly higher SOC stocks than forest (+6.8 +/- 3.1%), whereas croplands (n=18, mean age = 8.7years) 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 clear effect of tillage on the SOC response. Management of pastures, whether they were degraded/nominal/improved, had no significant effect on SOC response. C-13 measurements on 16 pasture chronosequences showed that decay of forest-derived SOC was variable, whereas pasture-derived SOC was less so and was characterized by an accumulation plateau of 20 Mg SOC ha(-1) after 20years. The large uncertainties in SOC response observed could be derived from the chronosequence approach, sensitive to natural soil variability and to human management practices. This study emphasizes the need for diachronic and long-term studies, associated with better knowledge of agroecosystem management.

Author Keyword(s)
  • annual crop
  • carbon storage
  • chronosequence
  • deforestation
  • grassland
  • humid tropics
  • rainforest
  • soil organic matter
  • soil tillage
  • delta C-13
KeyWord(s) Plus
  • LAND-USE CHANGE
  • SLASH-AND-BURN
  • BRAZILIAN AMAZON
  • EASTERN AMAZONIA
  • MATTER DYNAMICS
  • RAIN-FOREST
  • SIZE-FRACTIONS
  • TROPICAL SOILS
  • CLIMATE-CHANGE
  • DEFORESTATION
ESI Discipline(s)
  • Environment/Ecology
Web of Science Category(ies)
  • Biodiversity Conservation
  • Ecology
  • Environmental Sciences
Adress(es)

[Fujisaki, Kenji; Perrin, Anne-Sophie] Ctr Tech Interprofessionnel Oleagineux & Chanvre, EPLEFPA Guyane, F-97355 Macouria, Guyane Francais, France; [Fujisaki, Kenji; Bernoux, Martial; Brossard, Michel] IRD, UMR Eco & Sols 210, F-34060 Montpellier 02, France; [Desjardins, Thierry] IRD, UMR iEES Paris 242, F-93143 Bondy, France; [Balbino, Luiz Carlos] EMBRAPA Cerrados, BR-73310970 Planaltina, DF, Brazil

Reprint Adress

Brossard, M (reprint author), IRD, UMR Eco & Sols 210, Campus SupAgro,Bat 12,2 Pl Viala, F-34060 Montpellier 02, France.

Country(ies)
  • Brazil
  • France
CNRS - Adress(es)
  • Institut d'écologie et des sciences de l'environnement de Paris (IEES), UMR7618
Accession Number
WOS:000356422500027
uid:/5NQM3RN3
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