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Fate of soil applied black carbon: downward migration, leaching and soil respiration

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Title Fate of soil applied black carbon: downward migration, leaching and soil respiration
 
Creator Major, J
Lehmann, Johannes
Rondón, Marco Antonio
Goodale, C
 
Subject leaching
soil respiration
lixiviacion
respiración del suelo
ecology
 
Description Black carbon (BC) is an important pool of the global C cycle, because it cycles much more slowly than others and may even be managed for C sequestration. Using stable isotope techniques, we investigated the fate of BC applied to a savanna Oxisol in Colombia at rates of 0, 11.6, 23.2 and 116.1 t BC ha?1, as well as its effect on non-BC soil organic C. During the rainy seasons of 2005 and 2006, soil respiration was measured using soda lime traps, particulate and dissolved organic C (POC and DOC) moving by saturated flow was sampled continuously at 0.15 and 0.3 m, and soil was sampled to 2.0 m. Black C was found below the application depth of 0–0.1 m in the 0.15–0.3 m depth interval, with migration rates of 52.4±14.5, 51.8±18.5 and 378.7±196.9 kg C ha?1 yr?1 (±SE) where 11.6, 23.2 and 116.1 t BC ha?1, respectively, had been applied. Over 2 years after application, 2.2% of BC applied at 23.2 t BC ha?1 was lost by respiration, and an even smaller fraction of 1% was mobilized by percolating water. Carbon from BC moved to a greater extent as DOC than POC. The largest flux of BC from the field (20–53% of applied BC) was not accounted for by our measurements and is assumed to have occurred by surface runoff during intense rain events. Black C caused a 189% increase in aboveground biomass production measured 5 months after application (2.4–4.5 t additional dry biomass ha?1 where BC was applied), and this resulted in greater amounts of non-BC being respired, leached and found in soil for the duration of the experiment. These increases can be quantitatively explained by estimates of greater belowground net primary productivity with BC addition.
 
Date 2010-04
2014-09-24T08:42:09Z
2014-09-24T08:42:09Z
 
Type Journal Article
 
Identifier 1354-1013
1365-2486
https://hdl.handle.net/10568/43456
https://onlinelibrary.wiley.com/doi/10.1111/j.1365-2486.2009.02044.x/abstract
https://doi.org/10.1111/j.1365-2486.2009.02044.x
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Publisher Wiley
 
Source Global Change Biology