Impact of Global Warming on Soil Organic Carbon

Latitude-dependent underestimation of microbial extracellular enzyme activity in soils

“…Microbial enzymatic activity to depolymerise soil organic matter can be influenced by numerous factors (Conant et al 2011;Davidson and Janssens 2006;Smith et al 2008). Temperature is an important factor affecting microbial activity in soils and shows relationships with many biological, physical and chemical processes (Conant et al 2011;Davidson and Janssens 2006).…”

“…Temperature is an important factor affecting microbial activity in soils and shows relationships with many biological, physical and chemical processes (Conant et al 2011;Davidson and Janssens 2006). Some research have focused on the quality or degradability of organic matter in soils and the effects of climate change on its decomposition (Fierer et al 2005;Smith et al 2008;Wetterstedt et al 2010). The temperature effects on availability and adsorption onto particles of soil organic matter is scarcely understood (Davidson and Janssens 2006).…”

“…Carbon stock is much larger in soil than in the atmosphere (Conant et al 2011;Davidson and Janssens 2006;Smith et al 2008). The accumulation and utilization of organic matter in soils rules the carbon balance between terrestrial environments and atmosphere.…”

“…The accumulation and utilization of organic matter in soils rules the carbon balance between terrestrial environments and atmosphere. Inputs from plant-derived carbon and outputs by decomposition and mineralization result in feedback mechanisms having major impacts on Earths climate (Conant et al 2011;Davidson and Janssens 2006;Smith et al 2008). Factors inducing changes to that equilibrium need to be understood for accurate predictive modeling and simulations (Davidson and Janssens 2006).…”

Soil carbon storage and its determinants in the forests of Shaanxi Province, China

“…着地球表层各系统之间的碳循环。据估计, 全世界 土壤有机碳储量约为1 550 Pg (Lal, 2004), 是植被 碳 库的2 至 3 倍 , 是大气碳库 的2 倍 (Smith et al, 2008)。由于土壤的呼吸作用, 土壤碳库较小幅度的 变化就可能影响生态系统各组分的碳交换过程, 对 陆地生态系统碳循环产生至关重要的影响。森林作 为陆地生态系统的主体, 是陆地上最大的碳储库和 碳汇, 其土壤碳贮量约占陆地土壤的73% (Post et al, 1982) …”