Nitrogen and carbon isotopes in Finnish wood decay fungi

This provides statistical analyses and supplementary data for carbon and nitrogen isotopes in wood decay fungi from three Picea abies stands in Finland. Original data were from: Chen J, Heikkinen J, Hobbie E, Rinne-Garmston K, Penttilä R, Mäkipää R (2019) Strategies of carbon and nitrogen acquisition by saprotrophic and ectomycorrhizal fungi in Finnish boreal Picea abies-dominated forests. Fungal biology 123 (6):456-464.
Abstract of our work is:
We examined whether sporocarp carbon and nitrogen isotope ratios (δ13C and δ15N values) reflected different functional strategies in 15 species of wood decay fungi. In Finnish Picea abies forests, we compared sporocarp δ13C and δ15N against log diameter, proximity to ground, and wood decay type (brown rot, nonselective white rot, and selective white rot (targeting hemicellulose and lignin preferentially). In regression analysis (adjusted r2 = 0.576), species accounted for 31% of variability in δ13C, with factors influencing wood δ13C accounting for the remainder. Brown rot fungi and three white rot fungi that selectively attacked hemicellulose (Heterobasidion parviporum, Phellopilus nigrolimitatus, and Trichaptum abietinum) were higher in δ13C than nonselective white rot fungi. This was attributed to greater assimilation of 13C-enriched pentoses by these fungi. The parasitic white rot fungus Heterobasidion parviporum had higher δ15N with proximity to ground and increasing log size. This suggested that 15N-enriched soil N contributed to decomposing logs and that Heterobasidion growing from a bigger resource base had increased access to soil N. These isotopic patterns accordingly reflected both functional diversity of wood decay fungi and site-specific factors. In review at Fungal Ecology.

本数据集提供了芬兰三个 Pinus abies 栖息地中木质腐朽真菌中碳和氮同位素（碳同位素δ13C和氮同位素δ15N值）的统计分析及补充数据。原始数据来源于：Chen J, Heikkinen J, Hobbie E, Rinne-Garmston K, Penttilä R, Mäkipää R (2019) 纤维素分解真菌和丛枝菌根真菌在芬兰针叶林中碳氮获取策略。真菌学 123 (6): 456-464。

本研究的摘要如下：

我们研究了孢子果碳氮同位素比率（δ13C和δ15N值）是否反映了15种木质腐朽真菌的不同功能策略。在芬兰的 Pinus abies 森林中，我们将孢子果δ13C和δ15N与树干直径、与地面的距离以及木质腐朽类型（褐色腐朽、非选择性白腐朽和选择性白腐朽[优先攻击半纤维素和木质素]）进行比较。在回归分析中（调整后的r2 = 0.576），物种解释了δ13C变异性中的31%，其余因素影响了木质δ13C。褐色腐朽真菌以及三种选择性攻击半纤维素的白色腐朽真菌（Heterobasidion parviporum、Phellopilus nigrolimitatus和Trichaptum abietinum）的δ13C高于非选择性白腐朽真菌。这归因于这些真菌对13C富集的五糖的更高同化。寄生的白色腐朽真菌Heterobasidion parviporum的δ15N值随着与地面的接近和树干尺寸的增加而升高。这表明富含15N的土壤氮对分解的木材有贡献，并且从更大资源库中生长的Heterobasidion对土壤氮的获取增加了。这些同位素模式相应地反映了木质腐朽真菌的功能多样性以及特定地点的因素。稿件正在《真菌生态学》杂志审阅中。