Carbon dioxide fluxes in a southern plains prairie

Ecosystem Respiration in a Seasonally Snow-Covered Subalpine Grassland

“…These large interannual differences in ecosystem respiration may have important implications for ecosystem C balance (Flanagan et al, 2002;Hunt et al, 2004). For example, variation in ecosystem respiration was at least partially responsible for a temperate grassland in New Zealand switching between being a net source of CO 2 in a dry year to a net sink in a wet year (Hunt et al, 2004), and similar results have been reported from other grasslands (Sims and Bradford, 2001;Flanagan et al, 2002) and forests (e.g. van Gorsel et al, 2008).…”

Terrestrial Carbon Sequestration as a Climate Change Mitigation Activity

“…Their study indicates that Chinese grasslands cover 6.4-9.5% of the world's grassland area and store 4.4-11.9% of the carbon contained in grassland vegetation. Sims and Bradford [99] studied the relationship of vegetation structure and dynamics to CO 2 fluxes for a grass and a sagebrush-dominated Southern Plains mixed-grass prairie and evaluated their potential for carbon sequestration. From their study, they concluded that these Southern Plains mixed-grass prairie communities have the potential to sequester carbon.…”

Hysteresis response of daytime net ecosystem exchange during drought

“…For very low SWC (<0.04 m 3 m −3 ), NEE increased with PAR at first and then decreased considerably (NEE gets more positive resulted from ecosystem loss carbon to the atmosphere) when PAR exceeded 1300 µmol photons m −2 s −1 . A reduction in NEE in dry conditions has been observed in different ecosystems (Sims and Bradford, 2001;Hastings et al, 2005;Li et al, 2005;Fu et al, 2006;Aires et al, 2008b;Holst et al, 2008;Wang et al, 2008) and caused by midday stomata closure when irradiance, temperature, and VPD are all high, when the SWC is low (Sims and Bradford, 2001;Li et al, 2005;Aires et al, 2008b) or by enhanced ecosystem respiration at high temperature (Fu et al, 2006;Holst et al, 2008).…”