Effects of Exogenous Nitrogen Availability on Carbon Mineralization of Different Wetland Soil Types in Northeast China

  • 1. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, Jilin 130012, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2011-01-24

  Revised date: 2011-05-27

  Online published: 1997-12-20


To examine carbon(C) mineralization and microbial activities of different soil types under different levels of exogenous nitrogen(N) availabilities,three types of soil were collected from continuous permafrost,island permafrost and seasonally frozen ground,and incubated under laboratory conditions from June to October in 2010.The experiment was designed with four N levels,the amounts of exogenous N were 0(N0),0.1 mg/g(N1),0.2 mg/g(N2),0.5 mg/g(N3).The results indicated that the cumulative C mineralization of three types of soil under N0 treatment was 5 646 mg/kg,2 103 mg/kg and 1 287 mg/kg,respectively,which existed positive correlation with initial amount of soil organic C,total N and microbial carbon(MBC) in the end of incubation.The C mineralization rates and amount of cumulative mineralization of three types of soil under N0 treatment were all higher than under N treatment,indicated that exogenous N suppressed soil C mineralization.As the amount of exogenous N increasing,the inhibition of N on cumulative mineralization of different soil types was various.There was no significant difference of cumulative C mineralization of permafrost soil among three N treatments;the cumulative mineralization of island permafrost between N1 and N2 treatment was similar,but was all higher than N3 treatment;the difference of cumulative mineralization of seasonally frozen ground between N2 and N3 treatment was not notable,but was all lower than N1 treatment.After incubation,the values of MBN decreased and MBC/MBN increased along with exogenous N increasing.The cumulate mineralization of seasonal frozen soil positively related with MBN,and negatively related with MBC/MBN,which indicated that nitrogen availability may affect the carbon mineralization by changing microbial structure and composition.

Cite this article

LI Ying-chen, SONG Chang-chun, HOU Cui-cui, WANG Xian-wei, SUN Xiao-xin . Effects of Exogenous Nitrogen Availability on Carbon Mineralization of Different Wetland Soil Types in Northeast China[J]. SCIENTIA GEOGRAPHICA SINICA, 2011 , 31(12) : 1480 -1486 . DOI: 10.13249/j.cnki.sgs.2011.012.1480


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