Carbon and Nitrogen Transformations in Surface Soils Under Ermans Birch and Dark Coniferous Forests  

作　　者：DENG Xiao-Wen HAN Shi-Jie HU Yan-Ling ZHOU Yu-Mei 

机构地区：[1]Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 China [2]Tianjin Academy of Environmental Sciences, Tianjin 300191 China

出　　处：《Pedosphere》2009年第2期230-237,共8页土壤圈（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(No.90411020);the National Key Basic Research Program(973 Program)of China(No.2002CB412502)

摘　　要：Soil samples were taken from an Ermans birch （Betula ermanii）-dark coniferous forest （Picea jezoensis and Abies nephrolepis） ecotone growing on volcanic ejecta in the northern slope of Changbai Mountains of Northeast China, to compare soil carbon （C） and nitrogen （N） transformations in the two forests. The soil type is Umbri-Gelic Cambosols in Chinese Soil Taxonomy. Soil samples were incubated aerobically at 20℃ and field capacity of 700 g kg^-1 over a period of 27 weeks. The amount of soil microbial biomass and net N mineralization were higher in the Ermans birch than the dark coniferous forest （P 〈 0.05）, whereas the cumulative C mineralization （as CO2 emission） in the dark coniferous forest exceeded that in the Ermans birch （P 〈 0.05）. Release of the cumulative dissolved organic C and dissolved organic N were greater in the Ermans birch than the dark coniferous forest （P 〈 0.05）. The results suggested that differences of forest types could result in considerable change in soil C and N transformations.Soil samples were taken from an Ermans birch(Betula ermanii)-dark coniferous forest(Picea jezoensis and Abies nephrolepis)ecotone growing on volcanic ejecta in the northern slope of Changbai Mountains of Northeast China,to compare soil carbon(C)and nitrogen(N)transformations in the two forests.The soil type is Umbri-Gelic Cambosols in Chinese Soil Taxonomy.Soil samples were incubated aerobically at 20-C and field capacity of 700 g kg-1 over a period of 27 weeks.The amount of soil microbial biomass and net N mineralization were higher in the Ermans birch than the dark coniferous forest(P<0.05),whereas the cumulative C mineralization(as CO2 emission)in the dark coniferous forest exceeded that in the Ermans birch(P<0.05).Release of the cumulative dissolved organic C and dissolved organic N were greater in the Ermans birch than the dark coniferous forest(P<0.05).The results suggested that differences of forest types could result in considerable change in soil C and N transformations.

关 键 词：dissolved organic C dissolved organic N Ermans birch-dark coniferous forest soil C transformation soil N transformation 

分 类 号：S718.54[农业科学—林学] S153.621