几种棉花VA菌根菌有效性的比较研究

COMPARATIVE STUDY ON EFFICENCY OF DIFFERENT SPECIES OF VAM FUNGI ON COTTON

Four species of Vesicular-Arbuscular mycorrhiza fungi, Glomus mosseae (Nicol. and Gerd. ) Gerd.and Trappe, G.hoi Berch and Trappe, G. albidum var. Qianjiang ( Walker and Rhodes ) Wang P. and Z. M. Q., G.intraradices Schenck and Smith, isolated from cotton rhizosphere soils, were selected to compare their effects on cotton ( Gossypium hirsutum L. ) in pot experiment. Thirty days after inoculating with VAM fungi, there were significant differences(p<0.05 ) in infection rate and hyphae density on root surface among the four species. The differences diminished by sixty days after inoculating.The total amo unt of spores produced by the four species, was ordered as G.albidum, G.intraradices,G. mosseae. Most of spores formed by the former two species distributed at 10 cm below soil surface.The spores formed by the latter two species were distributed equally in O-10cm and 10cm below soil surface. The growth and phosphorus uptake rates of cotton inoculated with VAM fungi were significantly higher than control ( p<0.01 ) , but there were no signifi cant difference among plants inoculated with different species of VAM fungi, except the initial stage of cotton growth