Mycorrhizae Alter Quality and Quantity of Carbon Allocated Below Ground

Plants and soils are a critically important element in the global carbon-energy equation. t is estimated that in forest ecosystems over two-thirds of the carbon is contained in soils and peat deposits. espite the importance of forest soils in the global carbon cycle, fluxes of carbon associated with fundamental processes and soil functional groups are inadequately quantified, limiting our understanding of carbon movement and sequestration in soils. he authors report the direct measurement of carbon in and through all major pools of a mycorrhizal (fungus-root) coniferous seedling (a complete carbon budget). he mycorrhizal symbiont reduces overall retention of carbon in the plant-fungus symbiosis by increasing carbon in roots and below-ground respiration and reducing its retention and release above ground. elow ground, mycorrhizal plants shifted allocation of carbon to pools that are rapidly turned over, primarily to fine roots and fungal hyphae, and host root and fungal respiration. ycorrhizae alter the size of below-ground carbon pools, the quality and, therefore, the retention time of carbon below ground. he data indicate that if elevated atmospheric CO2 and altered climate stressors alter mycorrhizal colonization in forests, the role of forests in sequestering carbon could be altered.