谢家沟不同类型草地AM真菌侵染状况与土壤理化性质的关系

为探究谢家沟不同草地类型土壤理化性质对草地群落丛枝菌根(arbuscular mycorrhizal,AM)真菌侵染特征的影响,笔者通过调查采样,分析了4种典型草地(山地草甸、草甸草原、草原和草原化荒漠)与AM真菌的侵染状况和土壤因子间的关系。结果表明:4种草地类型典型植物均能被AM真菌侵染,草原化荒漠、草甸草环与草原换位置、山地草甸的平均菌根侵染率分别为79.90%、89.04%、85.93%和68.66%,草甸草原是侵染状况最好的草地类型。根际土壤有机质、碱解氮、速效磷与AM真菌侵染呈正相关关系,盐分和p H与AM真菌侵染为负相关关系,但土壤总盐含量在2.1 g/kg左右时侵染率、侵染强度最高。自然条件下土壤因子与菌根的侵染及发育状况密切相关,土壤养分的高低制约着AM真菌侵染强弱,有机质和盐分是关键影响因子。

Relationship Between AM Fungi Infection Situation of Different Grassland Types and Soil Physichemical Properties in Xiejiagou

To study the effect of soil physical and chemical properties of different grassland types on the infection characteristics of AM fungi in Xiejiagou, through the investigation and sampling, the relationship between AM fungi infection situation and soil factors of 4 types of grassland (mountain meadow, meadow steppe, steppe and steppe desert) was studied. The results showed that the typical plants in the four grassland types could be infected by AM fungi, the average infection rate of mountain meadow, meadow steppe, grassland and steppe desert were 79.90%, 89.04%, 85.93% and 68.66%, respectively, meadow steppe was the grassland type with the best infection situation. The content of rhizosphere soil organic matter, available nitrogen, available phosphorus was positively correlated with AM fungi infection situation, salt content and pH werenegatively correlated with AM fungal infection situation, but the infection rate and intensity reached the highest when salt content was around 2.1 g/kg. Under natural condition, soil factors were closely related to the infection and development of mycorrhizal, the level of soil nutrient restricted the infection of AM fungi, and organic matter and salinity were key influencing factors.