Desert grassland dynamics estimated from carbon isotopes in grass phytoliths and soil organic matter

2000 ◽  
Vol 11 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Mitchel P. McClaran ◽  
Marcelle Umlauf
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Carbon Isotopes ◽  
Desert Grassland

Late Quaternary Vegetation Dynamics in the Southern Amazon Basin Inferred from Carbon Isotopes in Soil Organic Matter

2001 ◽  
Vol 55 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Hermes Augusto de Freitas ◽  
Luiz Carlos Ruiz Pessenda ◽  
Ramon Aravena ◽  
Susy Ely Marques Gouveia ◽  
Adauto de Souza Ribeiro ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Carbon Isotopes ◽  
Vegetation Dynamics ◽  
Amazon Basin ◽  
Late Quaternary ◽  
Savanna Vegetation ◽  
Forest Regions ◽  
Dry Conditions ◽  
Forested Areas

AbstractCarbon isotopes of soil organic matter (SOM) were used to evaluate and establish the chronology of the vegetation dynamics of an ecosystem presently composed of savannas surrounded by forests. The study was carried out on a 200-km transect along highway BR 319, on the border of Amazonas and Rondônia states, in southern Amazon, Brazil. Large ranges in δ13C values were observed in SOM collected from profiles in the savanna (−27 to −14‰) and forest regions (−26 to −19‰), reflecting changing distribution of 13C-depleted C3 forest and 13C-enriched C4 savanna vegetation in response to climate change. These results indicate that from about 17,000 to 9000 14C yr B.P., the study area was covered by forest vegetation. Between approximately 9000 and 3000 14C yr B.P., savanna vegetation expanded at the expense of the forest. Although the expansion of savanna did not occur with the same intensity along the study transect, this process was very clearly registered by 13C-enrichment in the SOM. Since 3000 14C yr B.P., the carbon isotope data suggest that forested regions have expanded. This study adds to the mounting evidence that extensive forested areas existed in the Amazon during the last glaciation and that savanna vegetation expanded in response to warm and dry conditions during the early to middle Holocene.

scholarly journals Past vegetation changes in the Brazilian Pantanal arboreal-grassy savanna ecotone by using carbon isotopes in the soil organic matter

1995 ◽  
Vol 1 (3) ◽  
pp. 165-171 ◽  
Author(s):  
REYNALDO LUIZ VICTORIA ◽  
FERNANDO FERNANDES ◽  
LUIZ ANTONIO MARTINELLI ◽  
MARISA CASSIA PICCOLO ◽  
PLINIO BARBOSA CAMARGO ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Carbon Isotopes ◽  
Vegetation Changes ◽  
Brazilian Pantanal

The use of stable carbon isotopes for estimating soil organic matter turnover rates

Geoderma ◽  
1998 ◽  
Vol 82 (1-3) ◽  
pp. 43-58 ◽  
Author(s):  
Martial Bernoux ◽  
Carlos C Cerri ◽  
Christopher Neill ◽  
Jener F.L de Moraes
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Carbon Isotopes ◽  
Stable Carbon Isotopes ◽  
Stable Carbon ◽  
Turnover Rates ◽  
Organic Matter Turnover ◽  
Soil Organic Matter Turnover

Spatial and temporal distribution of carbon isotopes in soil organic matter at the Dinghushan Biosphere Reserve, South China

2005 ◽  
Vol 273 (1-2) ◽  
pp. 115-128 ◽  
Author(s):  
Qingqiang Chen ◽  
Chengde Shen ◽  
Yanmin Sun ◽  
Shaolin Peng ◽  
Weixi Yi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Carbon Isotopes ◽  
South China ◽  
Temporal Distribution ◽  
Biosphere Reserve ◽  
Spatial And Temporal Distribution
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