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• W2129646897 abstract "This paper presents carbon isotope data on soil organic matter (SOM) collected along an ecosystem transect that includes a wooded savannah (cerrado), a tropical semideciduous forest (cerradão), a forest tran sition type and a tropical forest. The study area is located in the Rondonia state, southwestern Brazilian Amazon region. 14 C data of total soil organic matter and charcoal indicate that the organic matter in these soils is at least Holocene in age. The forest and forest transition sites are characterized by δ 13 C soil depth profiles gener ated typically by C 3 plants, indicating no major changes in plant communities have occurred in this region during the time period represented by the isotope data. In contrast, the cerrado and cerradão have experienced significant vegetation changes during the Holocene. The d 13 C data (-30‰ to -27‰) obtained in the deepest part of the profile at the cerradão site show the expansion of the C 3 forest vegetation into this region during early Holocene. A vegetation change consisting of increased C 4 plant influence is reflected in the 13 C-enriched 13 C record shows a clear expansion of C 3 vegetation, particularly at the cerradão site. The regression/expansion of the forest and savannah vegetation documented at the cerradão and cerrado sites is probably related to changes from a humid to a drier climate and a return to more humid conditions and is in agreement with palaeoclimatic information reported for Brazil and the Bolivian Altiplano. This study suggests that large areas in the Amazon basin have been affected by vegetation changes during the Holocene and that soil organic matter in the transition areas between savannah and forest ecotones contains a valuable palaeorecord of vegetation changes in the Ama zon region." @default.
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• W2129646897 date "1998-07-01" @default.
• W2129646897 modified "2023-09-23" @default.
• W2129646897 title "The carbon isotope record in soils along a forest-cerrado ecosystem transect: implications for vegetation changes in the Rondonia state, southwestern Brazilian Amazon region" @default.
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• W2129646897 doi "https://doi.org/10.1191/095968398673187182" @default.
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