Elucidating the nutritional dynamics of fungi using stable isotopes

被引:112
作者
Mayor, Jordan R. [1 ]
Schuur, Edward A. G. [1 ]
Henkel, Terry W. [2 ]
机构
[1] Univ Florida, Dept Bot, Gainesville, FL 32611 USA
[2] Humboldt State Univ, Dept Biol Sci, Arcata, CA 95521 USA
基金
美国安德鲁·梅隆基金会; 美国国家科学基金会;
关键词
C-13; N-15; discriminant analysis; ectomycorrhizae; microbial ecology; nutrient cycling; saprotroph; N-15; NATURAL-ABUNDANCE; MYCORRHIZAL FUNGI; ECTOMYCORRHIZAL FUNGI; GLOBAL PATTERNS; FRUIT BODIES; NITROGEN; CARBON; C-13; SOIL; RATIOS;
D O I
10.1111/j.1461-0248.2008.01265.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Mycorrhizal and saprotrophic (SAP) fungi are essential to terrestrial element cycling due to their uptake of mineral nutrients and decomposition of detritus. Linking these ecological roles to specific fungi is necessary to improve our understanding of global nutrient cycling, fungal ecophysiology, and forest ecology. Using discriminant analyses of nitrogen (delta N-15) and carbon (delta C-13) isotope values from 813 fungi across 23 sites, we verified collector-based categorizations as either ectomycorrhizal (ECM) or SAP in > 91% of the fungi, and provided probabilistic assignments for an additional 27 fungi of unknown ecological role. As sites ranged from boreal tundra to tropical rainforest, we were able to show that fungal delta C-13 (26 sites) and delta N-15 (32 sites) values could be predicted by climate or latitude as previously shown in plant and soil analyses. Fungal delta C-13 values are likely reflecting differences in C-source between ECM and SAP fungi, whereas N-15 enrichment of ECM fungi relative to SAP fungi suggests that ECM fungi are consistently delivering N-15 depleted N to host trees across a range of ecosystem types.
引用
收藏
页码:171 / 183
页数:13
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