The ability of trees to acquire soil nutrients under future climate conditions will influence forest composition and function in a warmer world. Rarely are multiple belowground carbon allocation pathways measured simultaneously in large global change experiments, restricting our understanding of how trees may shift their allocation of resources to different nutrient acquisition mechanisms under future climates. Leveraging a 20‐year soil warming experiment, we show that ectomycorrhizal (EM) trees reduce mycorrhizal colonization and root exudation while increasing fine root biomass, while arbuscular mycorrhizal (AM) trees largely maintained their belowground carbon allocation patterns in warmer soils. We suggest that AM trees may be better adapted to thrive under global warming due to higher rates of nitrogen mineralization in warmer soils and the ability of their mycorrhizal symbiont to acquire mineralized inorganic nutrients, whereas EM trees may need to alter their belowground carbon allocation patterns to remain competitive as global temperatures rise.

中文翻译：

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长期土壤变暖导致丛枝菌根和外生菌根乔木的地下反应不同


树木在未来气候条件下获取土壤养分的能力将影响森林的组成和功能，以适应变暖的世界中的森林组成和功能。在大型全球变化实验中，很少同时测量多个地下碳分配途径，这限制了我们对树木在未来气候下如何将资源分配转移到不同养分获取机制的理解。利用 20 年的土壤变暖实验，我们表明外生菌根 （EM） 树减少了菌根定植和根系渗出，同时增加了细根生物量，而丛枝菌根 （AM） 树在温暖的土壤中基本保持了其地下碳分配模式。我们认为，由于温暖土壤中氮矿化速率较高，并且它们的菌根共生体能够获得矿化无机营养物质，因此 AM 树木可能更适应在全球变暖下茁壮成长，而 EM 树木可能需要改变其地下碳分配模式，以便在全球气温上升时保持竞争力。