Quantitative characteristics of soil micro-organisms of city forest ecological system in Changsha

In October 2010,the soil microorganism quantity distribution of Cinnamomum camphora,Pinus massoniana and the mixed forest in Tianjiling Botany Garden of Changsha city Hunan province was investigated with methed of dilution flat.The results show that the total numbers of soil micro-organism among Cinnamomum camphora,Pinus massoniana and the mixed forest had significant differences(P 0.05).the total number of soil microorganism of Cinnamomum camphora was 44.770×104,23.791×104 CFU/g for mixed forest and 7.107×104 CFU/g for Pinus massoniana,respectively.The total numers were ordered: Cinnamomum camphoramixed forestPinus massoniana.The main micro-organism in the soil is bacteria groups,the numerbers in Cinnamomum camphora was 32.933×104 CFU /g,21.067×104 CFU/g in the mixed forest and 5.556×104 CFU/g in Pinus massoniana,respectively.The numbers of fungus and actinomyces in Cinnamomum camphora,the mixed forest and Pinus massoniana were 0.600×104 and 11.237 × 104 CFU/g,1.040 ×104 and 1.684×104 CFU/g,0.687×104 and 0.864×104 CFU/g,respectively,the total bacterial counted 1.34%～25.10%.Three groups of soil microbial components were notably different proportion.The rate in Cinnamomum camphora was bacteria 73.56%,bacteria actinomycetes groups and filamentous fungi groups 25.10% and 1.34%,respectively.Similarly,in mixed forest were 88.55%,7.08% and 4.37%,respectively;in Pinus massoniana were 78.17%,12.17% and 9.66%,respectively.