• Arbuscular mycorrhizal fungi (AMF) and ectomycorrhizal fungi (EMF) produce contrasting plant–soil feedbacks, but how these feedbacks are constrained by lithology is poorly understood.
• We investigated the hypothesis that lithological drivers of soil fertility filter plant resource economic strategies in ways that influence the relative fitness of trees with AMF or EMF symbioses in a Bornean rain forest containing species with both mycorrhizal strategies.
• Using forest inventory data on 1245 tree species, we found that although AMF‐hosting trees had greater relative dominance on all soil types, with declining lithological soil fertility EMF‐hosting trees became more dominant. Data on 13 leaf traits and wood density for a total of 150 species showed that variation was almost always associated with soil type, whereas for six leaf traits (structural properties; carbon, nitrogen, phosphorus ratios, nitrogen isotopes), variation was also associated with mycorrhizal strategy. EMF‐hosting species had slower leaf economics than AMF‐hosts, demonstrating the central role of mycorrhizal symbiosis in plant resource economies.
• At the global scale, climate has been shown to shape forest mycorrhizal composition, but here we show that in communities it depends on soil lithology, suggesting scale‐dependent abiotic factors influence feedbacks underlying the relative fitness of different mycorrhizal strategies.

中文翻译：

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资源经济的岩性限制影响了婆罗洲雨林的菌根成分。

• 丛枝菌根真菌（AMF）和外生菌根真菌（EMF）产生相反的植物-土壤反馈，但是人们对这些反馈如何受岩性限制的了解很少。
• 我们研究了土壤肥力的岩性驱动因素以影响树木的AMF或EMF共生生物相对适合度的假说，该树木具有两种同时具有菌根策略的物种，该假设影响了树木与AMF或EMF共生的相对适应性。
• 使用关于1245种树木的森林清查数据，我们发现，尽管AMF寄主树在所有土壤类型上都具有相对优势，但随着岩性土壤肥力的下降，EMF寄主树变得更加占优势。关于总共150个物种的13种叶片性状和木材密度的数据表明，变异几乎总是与土壤类型有关，而对于6种叶片性状（结构性质；碳，氮，磷比率，氮同位素），变异也与土壤类型有关。菌根策略。EMF寄主物种的叶片经济学要比AMF寄主慢，这证明了菌根共生在植物资源经济中的核心作用。
• 在全球范围内，气候已显示出影响森林菌根组成的因素，但在这里我们表明，在社区中，气候取决于土壤岩性，表明规模依赖的非生物因素影响不同菌根策略相对适合度的反馈。