Dynamics of labile and recalcitrant soil carbon pools in a sorghum free-air CO2 enrichment (FACE) agroecosystem

Distribution of Organic Carbon in Different Soil Fractions in Ecosystems of Central Amazonia

“…This is achieved more quickly when the AFS are more diverse and more dense, which would be reflected sooner in higher production (due to a more closed canopy) and more diverse litter (due to the larger number of species, producing materials of different chemical qualities) (Luizão, 2007). Other previous experiments show that land agroecosystems can be a critical point in sequestering atmospheric CO 2 and important for future mitigation of atmospheric CO 2 (Cheng et al, 2007).…”

“…Physical, biological, and chemical properties of soils are attributed to SOM (Cheng et al, 2007), which is fundamental to the maintenance and sustainability of natural or managed ecosystems. Soil organic matter is considered a product of organic residues, mainly partially decomposed vegetation, in various stages of complexity and structural diversity (Feldpausch et al, 2004;Frouz et al, 2007).…”

A continuous labelling approach to recover photosynthetically fixed carbon in plant tissue and rhizosphere organisms of young beech trees (Fagus sylvatica L.) using 13C depleted CO2

“…A major fraction of the fixed carbon is transformed during succession into soil organic matter, resulting in the formation of humus (Kindler et al 2006). As a consequence of these processes soils become the largest stocks of carbon in terrestrial ecosystems (Cheng et al 2007).…”

Effects of High-Density, Short-Duration Planned Livestock Grazing on Soil Carbon Sequestration Potentials in a Coastal California Mixed Grassland

“…Researchers studying C dynamics found that fractionation of labile and recalcitrant soil C pools using 6 N HCl hydrolysis is a reliable method for detecting short-term changes in C (labile C). This acid treatment leaves recalcitrant C intact so that labile C may be measured as the difference between total and recalcitrant C. The study confirmed that C in the recalcitrant pool is significantly more stable, and thus older, than C in the labile pool (Cheng et al, 2007).…”

“…Hydrolysis (Cheng et al, 2007) or hot-and cold-water extractions may be useful methods for determining differences in the labile C fraction (Landgraf et al, 2006), which may respond more quickly to changes in management. During a 12-year study in the Southern Piedmont, significant C sequestration was found only in the surface 15 cm of soil of managed bermudagrass pastures (Franzluebbers and Stuedemann, 2005).…”