落叶松外生菌根根际真菌种群结构研究

Fungal Community Structure of Mycorrhizal Rhizosphere Soil of Larix gmelinii

采用稀释平板法分别对落叶松外生菌根根际和非根际土壤共36个样品的真菌进行了分离和鉴定。研究结果表明,从落叶松菌根根际分离到101株真菌,共鉴定出真菌18个属;菌根根际真菌的优势类群为拟青霉、木霉、青霉;亚优势种群为毛霉及茎点霉。木霉在菌根根际土壤中分离频率最高为100%,在数量上菌根根际真菌高出对照1.7～4倍。

Using the dilution-plate method, the fungi in mycorrhizal rhizosphere soil and soil beyond the scope of rhizosphere were isolated and identified based on 36 soil samples collected in Larix gmelinii plantation in Jinsha forest farm of Huanan county in Heilongjiang province. Totally 101 strains were isolated from the rhizosphere soil sam- ples. The results of statistical analysis showed that the dominant genus were Paecilomyces, Trichoderma and Penicillium, next came Mucor and Phoma. Trichoderma was isolated from all the soil samples, with the isolation frequency of 100 %. As far as the total number of fungi was concerned, that fungi number of rhizosphere soil was 1.7 to 4 times of that in soil samples beyond the scope of rhizosphere.