Research from Guizhou University shows that karst reservoirs, specifically those in limestone regions, act as powerful carbon sinks. By using a biological carbon pump, these systems convert inorganic carbon into organic biomass that becomes trapped in sediment. Study results from the Songbaishan Reservoir indicate that a high percentage of this stored carbon is recalcitrant, meaning it resists microbial breakdown. This suggests that karst landscapes may play a larger role in long term carbon sequestration than previously estimated in global climate models.
