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为了初步了解内蒙古大兴安岭兴安落叶松森林生态系统丛枝菌根真菌(AMF)多样性状况,调查了5种落叶松林型和火烧迹地土壤中AMF状况。从90份土样中共分离到AMF4属53种,其中无梗囊霉属Acaulospora 25种(47.17%),球囊霉属Glomus 23种(43.40%),此二属为优势属,内养囊霉属Entrophospora 4种(7.55%),巨孢囊霉属Gigaspora 1种(1.89%)。杜香落叶松林的优势种为浅窝无梗囊霉A.lacunosa;草地落叶松林没有优势种,最常见种为浅窝无梗囊霉A.lacunosa;柴桦落叶松林的优势种为一种无梗囊霉Acaulospora sp.3和缩球囊霉G.constrictum;落叶松皆伐林的优势种为刺无梗囊霉A.spinosa;落叶松渐伐林的优势种为一种球囊霉Glomussp.3;火烧迹地的优势种为刺无梗囊霉A.spinosa。5种林型中以柴桦落叶松林的孢子密度(41.00个/50g风干土)、物种丰富度(12.66种/土样)、多样性指数(H=2.12,D=0.85)都为最高。孢子密度与有机质含量呈明显正相关(r=0.956*),物种丰富度与速效磷含量呈明显的负相关(r=-0.899*)。
In order to understand the diversity of arbuscular mycorrhizal fungi (AMF) in Larix gmelinii forest of Daxinganling, Inner Mongolia, the AMF status of five species of Larix gmelinii forest and burned soil was investigated. A total of 53 species of AMF4 were isolated from 90 soil samples, including 25 species (47.17%) of Acaulospora and 23 species (43.40%) of Glomus. These two genera are dominant genera, 4 species of Entrophospora (7.55%), 1 species of Gigaspora (1.89%). The dominant species of A. lanceolata was A. lacunosa, A. lacunosa, and P. lanceolata was the dominant species. The most common species was A. lacunosa, Acinetobacter sp. 3 and G.constrictum; the dominant species of Larix olgensis was A. spinosa; the dominant species of Larix olgensis was Glomussp. 3; the dominant species in the burned area is A. spinosa. Among the five forest types, the spore density (41.00 / 50g dry soil), species richness (12.66 species / soil sample), diversity index (H = 2.12, D = 0.85) were highest in the Larix principis-rupprechtii forest. There was a significant positive correlation between spore density and organic matter content (r = 0.956 *). There was a significant negative correlation between species richness and available P (r = -0.899 *).