Abstract：For Larix olgensis + Larix kaempferi plantation management,through the spot investigation and experimental analysis,the change of soil microbiological properties in four densities of Larix olgensis + Larix kaempferi plantation was studied.The four sample stands were stand 1 with 2 500 trees per hectare,stand 2 with 3 300 trees per hectare,stand 3 with 4 400 trees per hectare and stand 4 with 6 600 trees per hectare.Results showed that 1) The quantity of total microorganism and bacteria in soil was in the decline order of stand 2,stand 1,stand 3 and stand 4;The quantity of fungus was in the decline order of stand 1,stand 3,stand 4 and stand 2;The quantity of actinomycetes was in the decline order of stand 3,stand 2,stand 1 and stand 4;2)The four densities of Larix olgensis + Larix kaempferi plantation had the same characteristic of reducing trend of microorganism quantity,that is the deeper the soil layer,the less the quantity of microorganism,and the decline degree of stand 1 and stand 2 was smaller than that of stand 3 and stand 4;3) The quantity change of microorganism and bacteria in every density of Larix olgensis + Larix kaempferi plantation can be classified into three stages,slow growth stage,fast growth stage and decline stage.The fungi quantity of stand 1 and stand 2 was larger in the early stage and less in the late stage.The fast growth stage of actinomycetes quantity of stand 2 and stand 3 presented in the middle stage,the actinomycetes quantity of stand 1 and stand 4 was larger in the early and late stage and less in the middle stage;4) To the young age of Larix olgensis + Larix kaempferi plantation,2 500-3 300 trees per hectare density was more suitable for the living and development of microorganism than 4 400 trees per hectare density,and 6 600 trees per hectare density was the worst density of all.This research would offer some scientific basis for choosing the density of the hybrid larch plantation.
王树力；孙悦；沈海燕；袁伟斌. 不同密度杂种落叶松人工林的土壤微生物变化特征[J]. 中国水土保持科学, 2009, 7(3): 59-66.
WANG Shu-Li-；Sun-Yue-；Chen-Hai-Yan-；Yuan-Wei-Bin. Changes of soil microbiological properties of <i>Larix olgensis</i>+Larix kaempferi plantation with the different densities. SSWCC, 2009, 7(3): 59-66.
2009, Vol. 7 
