The fate of primed soil carbon between biomass immobilization and respiration is controlled by nutrient availability

A positive Priming Effect (PE) is defined as an acceleration of the decomposition soil organic matter (SOM) by a fresh (FOM) input. But in literature many studies present this phenomenon extra loss carbon from SOM to atmosphere. actually mixture pools with different turnover rates, and microorganisms generating PE are heterotrophic. Therefore, whether fact C depends on targeted pool (high or low turnover) ratio between incorporation primed into microbial biomass vs its mineralization. A13 nutrient-poor tropical (enriched not cocktail nutrients) was incubated submitted two successive wheat-straw inputs differential 13C enrichment, order observe one straw other, measure specific respiration pools. In our soil, nutrient enrichment intensified basal while it lowered Our study showed that, allocation CO2 were similar depended status soil. We did any impact freshly amended fate previous amendment, but conversely we observed input rate following one, well liberated toward rather than CO2.