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采用盆栽和现实林分调查相结合的方法、研究了水曲柳落叶松纯林和混交林土壤微生物的主要生理 类群。结果表明．水曲柳纯林和落叶松混交林的微生物总量均较高。而落叶松纯林的数量相对较低。在水曲柳纯 林土壤中.磷细菌、巨大芽孢杆菌和蜡状芽孢杆菌的数量最多、混交林与落叶松纯林均较低。根际土与非根际土 （林地土）之间微生物总量的变化因树种而异、水曲柳无论在纯林和混交林中．根际土的微生物数量均高于林地 土．增力幅度为１１％～６２％。而落叶松根际土的微生物总数等于或略高于林地土。
The main physiological groups of soil microorganism in pure Ash and Larch mixed forest were studied by a combination of potted plants and realistic stands. The results show. The total amount of micro-organisms in both pure Fraxinus mandshurica and mixed larch forests was higher. However, the number of pure larch forests is relatively low. Phytophthora, B. megaterium and B. cereus were the most abundant in the pure soil of Fraxinus mandshurica, while the pure forests of mixed forest and larch were lower. The total amount of microorganisms in rhizosphere soil and non-rhizosphere soil (woodland soil) varies with the tree species, and both the pure and the mixed forest. The number of rhizosphere soil microorganisms were higher than the forest soil. Increase the power of 11% to 62%. While the total number of rhizosphere soil larch microorganisms equal to or slightly higher than the forest soil.