Plant-soil feedbacks from 30-year family-specific soil cultures: phylogeny, soil chemistry and plant life stage

Intraspecific negative feedback effects, where performance is reduced on soils conditioned by conspecifics, are widely documented in plant communities. However, interspecific feedbacks are less well studied, and their direction, strength, causes, and consequences are poorly understood. If more closely related species share pathogens, or have similar soil resource requirements, plants may perform better on soils conditioned by more distant phylogenetic relatives. There have been few empirical tests of this prediction across plant life stages, and none of which attempt to account for soil chemistry. Here, we test the utility of phylogeny for predicting soil feedback effects on plant survival and performance (germination, seedling survival, growth rate, biomass). We implement a full factorial experiment growing species representing five families on five plant family-specific soil sources. Our experiments exploit soils that have been cultured for over 30 years in plant family-specific beds ...

种内负反馈效应（即同种个体预处理的土壤会降低植物生长表现）已在植物群落中被广泛报道。然而，种间反馈的研究相对匮乏，其作用方向、强度、成因与后果均尚未明确。若亲缘关系较近的物种共享病原菌，或具有相似的土壤资源需求，那么植物在亲缘关系更远的系统发育类群预处理的土壤上可能生长更佳。目前鲜有跨植物生活史阶段的该预测实证检验，且尚无研究考虑土壤化学性质的影响。本研究旨在检验系统发育关系能否有效预测土壤反馈对植物存活与生长表现（萌发率、幼苗存活率、生长速率及生物量）的影响。我们采用完全析因实验设计，将代表5个植物科的物种种植于5种植物科专属土壤基质中。本实验所用土壤均在植物科专属栽培床中培育超过30年……