松嫩盐碱草地土壤理化特性与丛枝菌根真菌侵染的相关性

为考察松嫩盐碱草地的根际土壤和丛枝菌根(Arbuscular Mycorrhizal, AM)真菌之间的关系, 本研究于2013年7月在松嫩盐碱草地采集了11科26种植物根系和根际土壤, 分析了AM真菌的侵染状况和根际土壤理化性质。结果表明, 26种植物均能被AM真菌侵染, 侵染强度最高的是蒲公英(Taraxacum mongolicum), 达到79.25%, 最低的是扁蓄蓼(Polygonum aviculare), 只有3.37%。根际土壤有机质、全氮量与侵染率、侵染强度、泡囊丰度、丛枝丰度均表现出极显著的正相关性(P0.01), 土壤的pH值和全盐量与泡囊丰度表现出显著的负相关性(P0.05), 相关系数分别为－0.729和－0.449。以上结果表明, 土壤有机质含量和全氮含量对AM菌根的形成具有显著影响, pH值和全盐量仅对泡囊丰度有一定影响。

Relationship between soil properties and the colonization of arbuscular mycorrhizae inSongnen Saline-alkaline Grassland

To determine the relationship between the rhizosphere soil and AM (Arbuscular Mycorrhizal) fungi in Songnen saline-alkaline grassland, twenty six species in eleven families from Songnen saline-alkaline grassland were gathered and the colonization of AM fungi together with the physicochemical properties of rhizosphere were analyzed in July, 2013. The results showed that all the plant species were colonized by AM fungi, among which Taraxacum mongolicum got the highest colonization rate of 79.25%, while Polygonum aviculare got the lowest colonization rate of only 3.37%. Meanwhile, significant positive correlations were found between organic matter content and total nitrogen content of rhizosphere soil and the mycorrhizal colonization rate, colonization intensity, vesicle abundance and arbuscule abundance of AM fungi (P0.01); whereas significant negative correlations were shown between pH value and total salt content of the soil and the vesicle abundance of AM fungi (P0.05), with the correlation coefficient were －0.729 and －0.449, respectively. These experimental results indicated that the organic matter contents and total nitrogen contents of soil had a significant influence on the forming of AM fungi, whereas pH value and total salt content only had a certain influence on vesicle abundance.