【摘 要】
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For the last several decades,native broadleaved forests in many areas of south China have been converted into plantations of more productive forest species for timber use.This paper presents a case st
【机 构】
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College of Geographical Science,Fujian Normal University,Fuzhou 350007,China
【出 处】
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International Symposium on Forest Soils(2013年森林土壤国际研讨会)
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For the last several decades,native broadleaved forests in many areas of south China have been converted into plantations of more productive forest species for timber use.This paper presents a case study examining how this forest conversion affects soil respiration(Rs)and microbial biomass carbon(MBC)in surface soils(O-10cm)by comparing two 3 6 year-old plantation forests of Chinese fir(Cunninghamia lanceolata,CF)and Pinus massoniana(PM)with an adjacent relict natural forest of Castanopsis carlesii(NF,~200 year old)in Sanming,Fujian,China.From October 2010 to September 2012,Rs rate and MBC averaged 161.7 mg C m-2 h-1 and 508 mg kg-1 respectively in the NF.The corresponding values were 95.1 mg C m.2 h-1 and 412 mg kg-1 for CF,and 103.2 mg C m-2 h-1 and 399 mg kg-1 for PM,respectively.Mean annual carbon flux was 1421,837 and 907 g C m.2 yr-1 in NF,CF and PM,respectively.Significant differences(P<0.05)in Rs and MBC between NF and two plantations were found.The mean annual Rs was correlated significantly with mean annual soil temperature,soil organic matter(SOM)and MBC storages at 0-10 cm depth across different forests.Further,soil MBC was significantly correlated with SOM.These results indicated that forest conversion influenced soil properties such as soil temperature,microbial biomass and organic matter,which in turn affected the magnitude of soil respiration.How long these changes would persist needs the further study.Increased understanding of the effects of disturbance during forest conversion on the net exchange of C between soil and the atmosphere will enable more accurate modeling of ecosystem C cycling.
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