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3个云杉（Picea abies）林分中木材腐朽真菌的碳、氮同位素统计分析及补充数据。原始数据源自以下研究：Chen J、Heikkinen J、Hobbie E、Rinne-Garmston K、Penttilä R、Mäkipää R于2019年发表于《真菌生物学》（Fungal biology）第123卷第6期的《芬兰北方云杉主导林中共生腐生与外生菌根真菌的碳氮获取策略》，页码为456-464。本研究的摘要如下：我们针对15种木材腐朽真菌的子实体碳、氮同位素比值（δ¹³C与δ¹⁵N值）开展分析，探究其是否反映了不同的功能策略。在芬兰云杉林中，我们将子实体的δ¹³C与δ¹⁵N值与腐木直径、距地面高度以及木材腐朽类型（褐腐、非选择性白腐、选择性白腐——优先降解半纤维素与木质素）进行对比。回归分析（校正决定系数R²=0.576）显示，物种差异解释了δ¹³C值31%的变异，剩余变异由影响腐木δ¹³C的因素所导致。褐腐真菌以及3种选择性降解半纤维素的白腐真菌（异担子菌Heterobasidion parviporum、黑缘层孔菌Phellopilus nigrolimitatus以及刺孢多孔菌Trichaptum abietinum）的δ¹³C值高于非选择性白腐真菌，这一现象归因于此类真菌对富集¹³C的戊糖的同化作用更强。寄生性白腐真菌异担子菌（Heterobasidion parviporum）的δ¹⁵N值随距地面高度升高与腐木直径增大而升高，这表明富集¹⁵N的土壤氮参与了腐木分解过程，且从更大资源基生长的异担子菌可获取更多土壤氮。综上，这些同位素特征既反映了木材腐朽真菌的功能多样性，也体现了生境特异性因素。本研究目前正在《真菌生态学》（Fungal Ecology）期刊审稿中。