Ecological distribution patterns of soil microbes under artificial Eucalyptus Grandis stand

Abstract

Abstract: In order to find out the ecological distribution patterns of soil microbes under artificial Eucalyptus grandis stand,the amount and distribution of soil bacteria,fungi and actinomycetes in Hongya County of Sichuan Province were investigated in 2004.The results showed that soil microbial population under Eucalyptus grandis stand varied with seasons,being the maximum in autumn,fewer in spring,and the minimum in summer.The numbers were decreased in order of bacteria>actinomycetes>fungi,which were mainly concentrated in 020 cm soil layer,and rapidly decreased with increasing soil depth.In 060cm soil layer,the numbers of aerobic bacteria were 0.3110⁶14.3910⁶,actinomycetes were 0.0610⁶0.7910⁶,fungi were 0.0610⁶0.7910⁶,and anaerobes were 0.0510⁶3.2210⁶ CFU穏^-1.Comparing with artificial C.glauca stand and farming land,Eucalyptus grandis stand had a larger number of soil microbes,suggesting that Eucalyptus grandis was benefit for soil microbial activity.The Simpson and Shannon-Wiener index of the physiological groups of bacteria was 0.773 and 1.896,respectively.

Key words: Eucalyptus grandis, Soil microbes, Ecological distribution

CLC Number:

S718.52⁺1.3

FENG Jian, ZHANG Jian . Ecological distribution patterns of soil microbes under artificial Eucalyptus Grandis stand[J]. Chinese Journal of Applied Ecology, 2005, 16(8): 1422-1426.

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