Mycorrhizal associations of twenty plant species in four different plant communities of the Chebaling National Nature Reserve were investigated in the summer from 1995 to 1998. Except for two species (Dicranopteris linearis and Diospyros tsangii), eighteen species examined were associated with either vesicular-arbuscular mycorrhiza (VAM) or ectomycorrhiza (ECM). Four species of Fagaceae and Pinus massoniana were consistently associated with ECM while other thirteen species were associated with VAM. The fruiting bodies of ectomycorrhizal fungi were abundant and diverse in intact forest dominated by Fagaceae. Only a few species of macrofungal bodies were found in the pine dominated forest and secondary broad-leaved forest and none were seen in grassland during the study. VAM spore density was generally lower in the grassland than other community types. It is possibly due to degradation in floristic composition and soil fertility.%报道了广东省车八岭国家级自然保护区原生性阔叶林、次生性阔叶林、马尾松林及次生草坡等4种植物群落中20种植物的菌根感染率和土壤中内生菌根菌孢子的分布状况.除了2种植物:芒萁(Dicranopteris linearis)和曾氏柿(Diospyros tsangii)外,18种植物均可与真菌形成内生型或外生型菌根.其中,4种壳斗科植物和马尾松(Pinus massoniana)具有外生菌根,其它13种植物具有丛生-泡囊型内生菌根.外生菌根菌子实体在以壳斗科植物为优势种的原生性次生林中较多且种类丰富,在松林和次生阔叶林有少数种类,但次生草坡群落未见有外生菌根菌子实体.比较不同演替阶段土壤中内生孢子密度,内生孢子在各种植物群落中普遍存在,但在次生草坡中通常较少,这可能与草坡群落植物种类单一及土壤肥力低有关.
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