兴安落叶松林土壤微生物分布

THE DISTRIBUTION OF SOIL MICROORGANISM IN Larix gmelinii FOREST

本研究利用选择性培养基,研究了原始林中的草类-落叶松林(HLV)、柴桦-落叶松林(BLV),被干扰林中的皆伐-落叶松林(CL)、渐伐-落叶松林(SL)的土壤微生物的数量和种群组成。结果表明:土壤微生物随季节的变化是7月大于5月9、月,微生物的垂直变化是随着土层深度的增加,微生物数量呈递减趋势。从原始林与干扰林中共分离到细菌18属,优势菌属为短杆菌属(Brevibacterium)、芽孢杆菌属(Bacillus)、棒杆菌属(Corynebacterium)、微球菌属(Micrococcus);放线菌8属,优势属为链霉菌属(Streptomyces)、诺卡氏菌属(Nocardia);真菌18属,优势菌属为青霉属(Penicillium)和头孢属(Cephalosporium)。

The population structure and numbers of soil microorganisms in different forest types were studied in Ledum palustre-Herbage-L.gmelinii virgin forest,Betula-L.gmelinii virgin forest of the primary forest and clear cutting L.gmelinii forest,successive cutting L.gmelinii forest of the disturbed forest in the national forestry ecosystems station of Inner Mongolia Great Xingan Mountains by selective media.The results showed that the quantity of total microorganisms were JulyMay and September,the quantity of soil microorganisms were gradual lower with the increasing in vertical depth,follow orders： 0-10cm layer10-20cm layer20-30cm layer.Bacteria isolated from plots belonged to 18 genera,Brevibacterium,Bacillus,Corynebacterium and Micrococcus were main genera;actinomycetes were composed of 8 genera,Streptomyces and Nocardia were the main genera;fungi were composed of 18 genera,Penicillium and Cephalosporium were the dominant genera from the primary forest and disturbed forest.