2009年7月在内蒙古锡林郭勒盟正兰旗县城南样地,采集沙鞭(Psammochloa villosa(Trin.) Bor)和羊柴(Hedysalum laeve Min.)根围0～10 cm,10～20 cm,20～30 cm,30～40 cm和40～50 cm等5个土层土壤样品,研究AM真菌空间分布及其与土壤因子的相关性.结果表明:沙鞭和羊柴均能与AM真菌形成典型的I 型丛枝菌根.沙鞭和羊柴之间的菌丝定殖率、泡囊定殖率和总定殖率有显著差异及土壤速效N和速效P也有显著差异,AM真菌定殖率和孢子密度随土层加深而降低.试验中沙鞭和羊柴丛枝定殖率甚低,孢子密度与不同结构定殖率无显著相关性.沙鞭根围孢子密度与土壤速效P、酸性磷酸酶和碱性磷酸酶极显著正相关;羊柴根围孢子密度与有机质、酸性磷酸酶、碱性磷酸酶和脲酶极显著正相关.结论认为,AM真菌的侵染与植物种属存在一定的相关性,土壤因子对AM真菌侵染和菌根形成有显著影响.%Soil samples were collected in July 2009 and divided by a depth of 50 cm into 5 sections, i. e. 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm and 40-50 cm in the rhizosphere of Psarnrnochloa villosa and Hedysalurn laeve from the Zheng-lan Qi south-county of Xilinguole League of Inner Mongolia. The spatial distribution of AM fungi and its relationships with soil factors were analyzed. The results showed that they can form typical intermediate mycorrhizal type. There were significantly different between Psarnrnochloa villosa and Hedysalurn leave at hyphal colonization, vesicular colonization, total colonization, soil available N and soil available P. AM fungal colonization and spore density gradually decreased with soil depth. The arbuscular colonization was much lower. No significant correlation was found between AM fungal colonization and spore density. Spore density of Psarnmochloa villosa had a significantly positive correlation with soil available P, acid phosphatase and alkaline phosphatase, and spore density of Hedysalum laeve had a significantly positive correlation with soil organic matter, acid phosphatase, alkaline phosphatase and urease. It can be conclude that there is a certain correlation of AM fungal colonization and plant species, and the soil factors have a notable impact on AM fungal colonization and mycorrhizae formation.
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