Soil inorganic carbon(SIC)stocks continuously change from the formation of pedogenic carbonates,a process requiring inputs of Ca2+and Mg2+ions.This study ranked the soil orders in terms of potential inorganic carbon s...Soil inorganic carbon(SIC)stocks continuously change from the formation of pedogenic carbonates,a process requiring inputs of Ca2+and Mg2+ions.This study ranked the soil orders in terms of potential inorganic carbon sequestration resulting from wet Ca2+and Mg2+deposition from 1994 to 2003 within the continental United States.The analysis revealed that average annual atmospheric wet deposition of Ca2+and Mg2+was the highest in the Central Midwest-Great Plains region,likely due to soil particle input from loess-derived soils.The soil orders receiving the highest total average annual atmospheric wet Ca2+and Mg2+deposition,expressed as potential inorganic carbon formation(barring losses from erosion and leaching),were:1)Mollisols(1.1×108kg C),2)Alfisols(8.4×107kg C),3)Entisols(3.8×107kg C),and 4)Aridisols(2.8×107kg C).In terms of area-normalized result,the soil orders were ranked:1)Histosols(73 kg C km-2),2)Alfisols and Vertisols(64 kg C km-2),3)Mollisols(62 kg C km-2),and 4)Spodosols(52 kg C km-2).The results of this study provide an estimate of potential soil inorganic carbon sequestration as a result of atmospheric wet Ca2+and Mg2+deposition,and this information may be useful in assessing dynamic nature of soil inorganic carbon pools.展开更多
基金Supported by the National Science Foundation of USA(No.0340534)the U.S.Department of Agriculture(Nos.SC-1700278,SC-1700452,and SC-1700462)
文摘Soil inorganic carbon(SIC)stocks continuously change from the formation of pedogenic carbonates,a process requiring inputs of Ca2+and Mg2+ions.This study ranked the soil orders in terms of potential inorganic carbon sequestration resulting from wet Ca2+and Mg2+deposition from 1994 to 2003 within the continental United States.The analysis revealed that average annual atmospheric wet deposition of Ca2+and Mg2+was the highest in the Central Midwest-Great Plains region,likely due to soil particle input from loess-derived soils.The soil orders receiving the highest total average annual atmospheric wet Ca2+and Mg2+deposition,expressed as potential inorganic carbon formation(barring losses from erosion and leaching),were:1)Mollisols(1.1×108kg C),2)Alfisols(8.4×107kg C),3)Entisols(3.8×107kg C),and 4)Aridisols(2.8×107kg C).In terms of area-normalized result,the soil orders were ranked:1)Histosols(73 kg C km-2),2)Alfisols and Vertisols(64 kg C km-2),3)Mollisols(62 kg C km-2),and 4)Spodosols(52 kg C km-2).The results of this study provide an estimate of potential soil inorganic carbon sequestration as a result of atmospheric wet Ca2+and Mg2+deposition,and this information may be useful in assessing dynamic nature of soil inorganic carbon pools.
