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Carbon replacement and stability changes in short-term silvo-pastoral experiments in Colombian Amazonia

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Title Carbon replacement and stability changes in short-term silvo-pastoral experiments in Colombian Amazonia
 
Creator Mosquera V., Octavio
Buurman, Peter
Ramírez, Bertha L.
Amézquita, María Cristina
 
Subject agriculture
climate
carbon sequestration
land use
 
Description There is little information on the effects of land use change on soil Carbon stocks in Colombian Amazonia. Such information would be needed to assess the impact of this area on the global C cycle and the sustainability of agricultural systems that are replacing native forest. The aim of this study was to evaluate soil carbon stocks and changes after the clearing of the native forest, the establishment of pastures and the reclamation of the degraded pasture, in Caquetá, Colombia.

We compared the contents of Total C, Oxidizable C and Non-Oxidizable (stable) C in four different land use systems, namely Monoculture (Brachiaria grassland), Association (Brachiaria + Arachis pintoi), Forage Bank (a mixture of forage tree species), and Natural Regeneration of the pasture in both a flat area and a sloping one. The Degraded Pasture was the reference.

Results showed that in the sloping area all treatments have higher Total Carbon stocks than the Degraded Pasture, while three of the treatments significantly increased the stocks of Non-Oxidizable C.

In the flat landscape, only the Association significantly increased Total C stocks. Plowing and fertilization cause significant increases in Oxidizable carbon and decreases in Non-Oxidizable carbon. This effect needs further research, as C stability will influence equilibrium stocks.

In the sloping area, improved pastures and fodder bank rapidly increased Total Carbon contents and stocks, with increases as large as10 ton.ha?1 yr?1. In the Traditional Fodder Bank, which showed the largest increase, this is partially due to the application of organic manure. Surprisingly, also C stocks under Natural Regeneration were significantly higher than under the original Degraded Grassland. This increase was fully due to Non-Oxidizable Carbon, which is difficult to explain.

Stable isotope analysis indicated that under improved grassland, especially Brachiaria monoculture, up to 40% of the original C in the upper 10 cm was replaced in 3.3 years.
 
Date 2012-01
2014-08-15T12:13:17Z
2014-08-15T12:13:17Z
 
Type Journal Article
 
Identifier Mosquera O, Buurman P, Ramirez BL, Amezquita MC. 2012. Carbon replacement and stability changes in short-term silvo-pastoral experiments in Colombian Amazonia. Geoderma 170:56-63.
https://hdl.handle.net/10568/42022
https://doi.org/10.1016/j.geoderma.2011.09.016
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Format p. 56-63
 
Publisher Elsevier BV
 
Source Geoderma