Annual and seasonal CO₂ fluxes from Russian southern taiga soils

Winter soil CO2 efflux in two contrasting forest ecosystems on the eastern Tibetan Plateau, China

“…This is consistent with many results reported for coniferous forests (e.g., Vanhala 2002;Kurganova et al 2003). Soil temperature and moisture are two important factors that regulate temporal variations in soil respiration rates at the ecosystem level.…”

“…Brooks et al (2004) found that winter CO 2 fluxes were larger and less variable in deciduous forest than in coniferous forests. We estimated winter soil respiration at 150.4 g m -2 for the plantation and 176.3 g m -2 for the natural forest, which were comparable to the values reported for coniferous forests in Colorado, Wyoming, Idaho and Siberia (Sommerfeld et al 1993;McDowell et al 2000;Monson et al 2002;Kurganova et al 2003), and higher than those found in many other forest ecosystems (Zimov et al 1996;Brooks et al 1997;Mariko et al 2000;Hubbard et al 2005;Mo et al 2005;Vogel et al 2005). In this study, the winter contribution to the annual amount of CO 2 evolved from the soil (approximately 16 % in both forests) was consistent with the estimates of 10-50 % for forest ecosystems (Schindlbacher et al 2007;Wang et al 2010).…”

“…Our measured values of mean winter soil CO 2 efflux were higher than all of the values reported for boreal coniferous forest ecosystems or temperate deciduous broad-leaved or hardwood forest ecosystems (Rustad and Fernandez 1998;Kurganova et al 2003;Hubbard et al 2005;Groffman et al 2006;Suzuki et al 2006;Schindlbacher et al 2007;Wang et al 2010). For example, moderate soil CO 2 effluxes of 0.5-0.7 lmol m -2 s -1 were recorded during winter in coniferous forests in Austria, Germany, Russia and USA (Sommerfeld et al 1996;McDowell et al 2000;Kurganova et al 2003;Schindlbacher et al 2007;Muhr et al 2009). Comparatively low winter soil respiration rates were observed in two mixed conifer forests of different ages (50 and 300 years) in Colorado, USA (0.31 lmol m -2 s -1 for 50 years old forest and 0.35 lmol m -2 s -1 for 300 years old forest, Hubbard et al 2005), in a deciduous broadleaved forest in Japan (0.37 lmol m -2 s , Groffman et al 2006).…”

“…5 Variation of winter CO 2 effluxes in forest ecosystems with latitude. Data shown in the figure were reported in our study (Suzuki et al 2006;Hubbard et al 2005;Wang et al 2010;Groffman et al 2006;Rustad and Fernandez 1998;Schindlbacher et al 2007;McDowell et al 2000;Muhr et al 2009;Kurganova et al 2003) from low to high latitude mean winter soil CO 2 efflux at 31 N were much higher than those estimated for mid and high latitudes. Winter soil CO 2 efflux may be controlled by the soil substrate, root activity and subsurface temperature influenced by thickness and duration of snow cover (Brooks et al 2004;Monson et al 2006).…”

Effect of temperature and moisture on O₂ evolution rate of cultivated Phaeozem: analyses of a long-term field experiment

“…So, our estimations showed that the emission of CO 2 from cultivated soils during the cold period was an essential part of the annual emissions, which should be taken into account while calculating the carbon budget for the whole year. According to other studies (Sommerfeld et al 1993, Pajary 1995, Oechel et al 1997, Alm et al 1999, Zamolodchikov and Karelin 2001, Kurganova et al 2003) the winter soil respiration has been estimated to contribute 10% or more to the annual CO 2 flux from tundra soil and 20% or more from boreal ecosystems.…”