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• W2049421750 abstract "Secondary semideciduous, moist tropical forest at Mbalmayo (lat. 3°31′N; long. 11°30′E), Cameroon, has 108 trees ha−1 including representatives of 90 species and 33 families of angiosperms. The most abundant species, namely Alstonia boonei, Ricinodendron heudelotti and Terminalia superba, each contribute 5% to the total number of trees. These, and many of the other species, are known to form vesicular-arbuscular (VA) (endo-) mycorrhizal associations. Using a modification of the sucrose centrifugation method, spores of VA fungi were extracted from soil of undisturbed forest. The spores were attributed to five species of Acaulospora (laevigatum, mellea, morrowae, scrobiculata and spinosa), seven og Glomus (clavisporum, etunicatum, fasciculatum, geosporum, macrocarpum, occultum and rubiformis) and two of Scutellospora (coralloidea and pellucida). There were two other distinctive types of spores, C4 and C12, with affinities to spores of Acaulospora and Scutellospora respectively. A few spores seemed to be parasitized. Of the 250 spores per 100 g dry soil 63% were attributed to G. etunicatum and 18%, 6% and 5% to aggregates of G. occultum/A. scrobiculata, A. mellea/A. morrowae and C12/S. pellucida respectively. Although spores were very unevenly distributed (Simpson's equitability index = 0.025), mean numbers in replicate plots (each 1 ha) were fairly consistent. However, numbers of C4, A. spinosa, A. laevigatum and G. occultum/A. scrobiculata were significantly larger near the trunks of Terminalia superba than at a distance (7.5–10 m away). Total numbers of spores extracted on different occasions sometimes differed significantly, but effects of season were not established. However, during the 2 year period of the investigation numbers of spores of some relatively sparse species consistently decreased while those of others increased. Total numbers of spores in the rhizosphere soils of four tree species were usually twice as large as those of spores in bulk soil (440–600 compared with 250 per 100 g dry soil). As in bulk soil, numbers of spores in rhizosphere soils were dominated by G. etunicatum and G. occultum/A. scrobiculata, but spores of A. mellea/A. morrowae, which tended to be restricted to Entrandrophragma cylindricum and Khaya sp., were replaced by those of G. geosporum. G. etunicatum was more strongly associated with Lovoa trichilioides than Entrandrophragma cylindricum, Khaya sp. and Triplochiton scleroxylon. On the other hand, G. fasciculatum/G. macrocarpum was linked with Entrandrophragma cylindricum, Lovoa trichilioides and Triplochiton scleroxylon but not Khaya sp." @default.
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• W2049421750 title "Populations of spores of vesicular-arbuscular mycorrhizal fungi in undisturbed soils of secondary semideciduous moist tropical forest in Cameroon" @default.
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• W2049421750 doi "https://doi.org/10.1016/0378-1127(94)90117-1" @default.
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