NITROGEN ISOTOPE RATIOS IN DIFFERENT COMPARTMENTS OF A MIXED STAND OF SPRUCE, LARCH AND BEECH TREES AND OF UNDERSTOREY VEGETATION INCLUDING FUNGI
NITROGEN ISOTOPE RATIOS IN DIFFERENT COMPARTMENTS OF A MIXED STAND OF SPRUCE, LARCH AND BEECH TREES AND OF UNDERSTOREY VEGETATION INCLUDING FUNGI
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DOI：
10.1080/10256019308046133
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发表时间：
1993-01-01
期刊：
影响因子：
--
通讯作者：
DIETRICH, P
中科院分区：
文献类型：
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作者：
GEBAUER, G;DIETRICH, P
在德国巴伐利亚州东北部 Fichtelgebirge 的 11 年树龄混合林中的云杉 (Picea abies)、落叶松 (Larix decidua) 和山毛榉 (Fagus sylvatica) 的不同隔间（不同年龄级别和树冠位置的针叶或树枝、不同层位的根和土壤）中测量了天然氮同位素比率。此外，还分析了林下植被（主要是杜鹃花灌木和草）以及外生菌根和腐生真菌的样本。所有样品的 deltaN-15 值范围在 -7.5 到 +4.5 之间。尽管三种树种的叶子是常绿与落叶，并且根部深度不同，但没有发现显着差异。杜鹃花灌木的 deltaN-15 负值最大，而矿物层中的真菌和土壤的 deltaN-15 值最大。真菌的正 deltaN-15 值表明它们利用有机土壤氮的能力，但数据并没有明确表明形成菌根的植物从这种有机氮源中获益。
Natural nitrogen isotope ratios were measured in different compartments (needles or leaves and twigs of different age classes and crown positions, roots and soil of different horizons) of spruce (Picea abies), larch (Larix decidua) and beech (Fagus sylvatica) trees in an 11-year-old mixed stand in the Fichtelgebirge, NE Bavaria, Germany. In addition, samples of understorey vegetation (mainly ericaceous shrubs and grass) and of ectomycorrhizal and saprophytic fungi were analyzed. The deltaN-15 values found for all samples ranged between -7.5 and +4.5 parts per thousand. No significant differences were found for the nitrogen isotope ratios of the three tree species despite of their evergreen versus deciduous foliage and despite of their different rooting depth. Ericaceous shrubs had the most negative and fungi and soil from the mineral horizon the most positive deltaN-15 values. Positive deltaN-15 values of the fungi indicate their ability to utilize organic soil nitrogen, but the data do not unequivocally show that plants forming mycorrhizas profit from this organic nitrogen source.