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Changes in community structure of ectomycorrhizal fungi associated with Pinus montezumae across a volcanic soil chronosequence at Sierra Chichinautzin, Mexico

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Ectomycorrhizal (ECM) communities of Pinus montezumae Lamb. var. montezumae were studied across a volcanic soil chronosequence at Sierra del Chichinautzin, Mexico, to investigate differences in community structure at sites with different soil quality. Study sites were located on volcanic soils of different ages. Both aboveground and belowground fungal communities were compared for 3years. Species abundance, richness, and diversity were compared among sites. Significant differences were found among the three sites for sporocarp abundance and biomass but not for total ECM root tips. The more diverse sporocarp community was found at the youngest, less fertile site. Dominant species at the sporocarp and ECM morphotype levels differed across the chronosequence. The largest proportion of sporocarp species was site-exclusive, which suggests that aboveground communities depend upon soil conditions. Contrarily, 85% of ECM morphotypes were present at least at two sites. The poor correspondence between the aboveground and belowground views of the ECM fungal community may be due to differences in sampling methodology and level of identification. Inocybe and Laccaria species were abundant fruiters at all sites, and as multisite fungi, they may be tested for inoculum efficiency to be used in reforestation programs in the surroundings of Mexico City.

Les communautés d’ectomycorhizes (ECM) du Pinus montezumae Lamb. var. montezumae ont été examinées le long d’une chronoséquence de sol volcanique de la Sierra del Chichinautzin, au Mexique, dans le but d’étudier les différences de structure de communauté entre des stations sur des sols de différentes qualités. Les stations étudiées étaient sur des sols volcaniques d’âges différents. Les communautés fongiques tant souterraines qu’aériennes ont été comparées pendant trois ans. L’abondance, la richesse et la diversité des espèces ont été comparées entre les stations. Il y avait des différences significatives entre les trois stations quant à l’abondance et à la biomasse des carpophores mais le nombre total d’apex racinaires d’ECM était similaire. La communauté de carpophores la plus diversifiée a été observée dans la station la plus jeune et la moins fertile. Les espèces dominantes sur la base des carpophores et des morphotypes d’ECM différaient le long de la chronoséquence. La majorité des espèces de carpophores étaient exclusives à une station, ce qui indique que les communautés aériennes dépendent des conditions du sol. À l’inverse, 85 % des morphotypes d’ECM étaient présents dans au moins deux stations. La faible correspondance entre les deux visions des communautés de champignons ECM est peut-être due aux différences de méthodologie d’échantillonnage et de niveau d’identification. Les espèces d’Inocybe et de Laccaria fructifiaient abondamment dans toutes les stations et, en tant que champignons qui colonisent différentes stations, pourraient être testées pour l’efficacité de leur inoculum dans la perspective d’une utilisation dans les programmes de reboisement aux alentours de Mexico.

Document Type: Research Article

Publication date: 2010-06-01

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