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Published online 2 June 2005
Published in Soil Sci Soc Am J 69:1110-1117 (2005)
DOI: 10.2136/sssaj2004.0353
© 2005 Soil Science Society of America
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Soil Carbon Stabilization in Converted Tropical Pastures and Forests Depends on Soil Type

M. López-Ulloaa,b,*, E. Veldkampa and G. H. J. de Koninga,b

a Georg-August Univ., Institute of Soil Science and Forest Nutrition, Buesgenweg 2, 37077 Goettingen, Germany
b German Technical Cooperation (GTZ), Ecuador Casilla 17-07-8721, Quito, Ecuador



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  		Fig. 1. (a) Plot of {delta}13C values of soil C in secondary forest soils against forest age. (b) Plot of {delta}13C values in pasture soils against pasture age. (c) Plot of {delta}13C values of light fraction in forest soils against forest age. (d) Plot of {delta}13C values of light fraction in pasture soils against pasture age (circles corresponds to Inceptisols and squares to Andisols).

 


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  		Fig. 2. (a) Stocks of Soil C derived from pasture, forest and total C on pastures Andisols soil in the 0- to 0.25-m layer; (b) stocks of soil C derived from pasture, forest, and total C on pastures Inceptisols in 0-0.25m layer, (c) stocks of soil C derived from pasture, forest, and total C on secondary forest Andisols in the 0- to 0.25-m layer; (d) stocks of soil C derived from pasture, forest, and total C on secondary forest Inceptisols in the 0- to 0.25-m layer.

 




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