Temporal changes in the ectomycorrhizal community in two soil horizons of a temperate oak forest
Temporal changes in the ectomycorrhizal community in two soil horizons of a temperate oak forest
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DOI：
10.1128/aem.01592-08
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发表时间：
2008-09-01
影响因子：
4.4
通讯作者：
Garbaye, Jean
中科院分区：
文献类型：
--
作者：
Courty, Pierre-Emmanuel;Franc, Alain;Garbaye, Jean
在法国东北部一片橡树温带森林的两个土层(A1和A2)上，对外生菌根(ECM)群落的物种结构进行了为期15个月的每月评估。每个月通过内部转录间隔区测序鉴定外生菌根种类。共鉴定出75株真菌共生体。群落以绒毛菌科、红菇科、鹿角菌科和牛肝菌科为主。研究地点分布有4种：宁夏乳菇、拟青霉、地生假单胞菌和红菇。每一物种的相对丰度随土层和时间的不同而不同。A1层和A2层有一些种，如金龟子。嗜地梭菌主要分布在A2层，而枯草杆菌在A1层更为丰富。冬季可检测到一些种类，如Claugina sp.，而枯草杆菌和金龟子则常年存在。我们的结果支持这样的假设，即ECM群落的物种组成在一个月的过程中发生了快速更替。ECM物种的时空分布不均可以用它们的生态偏好来解释，这些偏好是由根系寿命、资源竞争和对环境变化的抗性等因素驱动的。
The species structure of an ectomycorrhizal (ECM) community was assessed monthly for 15 months in the two horizons (A1 and A2) of an oak temperate forest in northeastern France. Ectomycorrhizal species were identified each month by internal transcribed spacer sequencing. Seventy-five fungal symbionts were identified. The community was dominated by Tomentellaceae, Russulaceae, Cortinariaceae, and Boletales. Four species are abundant in the study site: Lactarius quietus, Tomentella sublilacina, Cenococcum geophilum, and Russula sp1. The relative abundance of each species varied depending on the soil horizon and over time. Some species, such as L. quietus, were present in the A1 and A2 horizons. C. geophilum was located particularly in the A2 horizon, whereas T. sublilacina was more abundant in A1. Some species, such as Clavulina sp., were detected in winter, while T. sublilacina and L. quietus were present all year long. Our results support the hypothesis that a rapid turnover of species composition of the ECM community occurs over the course of a month. The spatial and temporal unequal distribution of ECM species could be explained by their ecological preferences, driven by such factors as root longevity, competition for resources, and resistance to environmental variability.