15N natural abundance in fruit bodies of different functional groups of fungi in relation to substrate utilization
15N natural abundance in fruit bodies of different functional groups of fungi in relation to substrate utilization
复制标题
真菌不同功能群子实体中 15N 自然丰度与底物利用的关系
DOI：
10.1046/j.1469-8137.1999.00373.x
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发表时间：
1999
期刊：
影响因子：
9.4
通讯作者：
Andy F. S. Taylor
中科院分区：
文献类型：
--
作者：
G. Gebauer;Andy F. S. Taylor
测定了中欧温带混交林24种外生菌根真菌和腐生真菌34个子实体的自然丰度和N浓度。已知这两种生命形式的真菌能够利用不同类型的N源（来自腐殖质的有机N化合物，来自土壤的无机N和来自凋落物或木材的N），其15N自然丰度值不同。根据两种不同的生命形式和三种不同的氮源，将真菌划分为四个功能类群：(1)能够利用腐殖质有机氮的外生菌根真菌；(2)已知依赖土壤中无机氮化合物的外生菌根真菌；(3)腐殖质中能吸收有机氮的腐生植物；腐生植物利用枯木或凋落物中的氮。果体的δ15N值（−3.0 ~ 3.3‰）和N浓度（0.84 ~ 6.61 mmol eq N g dw−1）在种间差异较大。在大多数情况下，15N对真菌的富集程度高于它们各自的体氮源。生活在腐殖质中的真菌，可能可以获得有机N化合物（第1和第3组），比已知依赖无机N的真菌（例如拉菌属，第2组）或生活在凋落物或木材上的真菌（第4组）明显更富15N，无论它们是外生菌根还是腐生物种。生活在腐殖质中的真菌氮浓度显著高于生活在凋落物和木材上的真菌。
Natural abundances of 15N and N concentrations of 34 fruit bodies from 24 species of ectomycorrhizal and saprophytic fungi were measured in a temperate Central European mixed forest stand. The fungi of the two life forms are known to be capable of utilizing different types of N sources (organic N compounds from the humus, inorganic N from the soil and N from litter or wood) differing by their 15N natural abundance values. Based on the two life forms and the three different N sources, four functional groups of fungi were distinguished: (1) ectomycorrhizal fungi capable of utilizing organic N from the humus; (2) ectomycorrhizal fungi known to depend on inorganic N compounds in the soil; (3) saprophytes capable of utilizing organic N from the humus; and (4) saprophytes utilizing N from dead wood or litter. Large differences were found between species in the δ15N values (−3.0 to 3.3‰) and in the N concentrations (0.84 to 6.61 mmol eq N g dw−1) of the fruit bodies. In most cases fungi were more enriched in 15N than their respective bulk N source was. Fungi living in humus, and presumably having access to organic N compounds (groups 1 and 3), were significantly more enriched in 15N than fungi which are known to depend on inorganic N (e.g. Laccaria, group 2), or fungi living on litter or wood (group 4), irrespective of whether they were ectomycorrhizal or saprophytic species. Fungi living in humus had significantly higher N concentrations than fungi living on litter or wood.