In this greenhouse experiment we tested whether (i) ubiquitous arbuscular mycorrhizal fungi (AMF) taxa (Glomus claroideum, Glomus geosporum, Glomus intraradices, Glomus mosseae) singly and in a mixture differently affect growth and biomass production of four co-occurring grassland species (grass: Arrhenatherum elatius, non-leguminous forbs: Plantago lanceolata, Salvia pratensis and leguminous forb Trifolium pratense), and (ii) different soil sand contents alter AMF influence. We hypothesized that AMF effects on plants will increase with an increased AMF diversity and with increasing sand content. Percent AMF colonization of roots differed between plant species and AMF taxa and was higher with higher sand content. Plant growth responses to AMF were species-specific both regarding plants and AMF. Generally, biomass production of the non-leguminous forbs was the most responsive, the grass species the least and the legume intermediate both for AMF treatments and sand content. Across species, AMF influence on plant biomass increased with increasing soil sand content. Plant species growing in soil containing a mix of four AMF taxa showed similar growth responses than species in soil containing only one AMF taxon. These results suggest that both interference among AMF taxa and soil sand content can trigger the influence of AMF on plant production in grassland species.

中文翻译：

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土壤沙含量可以改变不同菌根真菌类群对草地物种植物生物量生产的影响


在这个温室实验中，我们测试了（i）普遍存在的丛枝菌根真菌（AMF）类群（Glomus claroideum、Glomus geosporum、Glomus intraradices、Glomus mosseae）是否单独或混合不同地影响四种共生草原物种的生长和生物量生产（草：Arrhatherum elatius，非豆科草本植物：车前草、鼠尾草和豆科草本植物三叶草），以及（ii）不同的土壤沙含量改变 AMF 影响。我们假设 AMF 对植物的影响会随着 AMF 多样性的增加和沙子含​​量的增加而增加。根部的 AMF 定殖百分比在植物种类和 AMF 分类群之间有所不同，并且随着沙子含量的增加而增加。植物生长对 AMF 的反应具有物种特异性，无论是植物还是 AMF。一般来说，对于 AMF 处理和沙子含量，非豆科草本植物的生物量生产反应最灵敏，禾本科植物的反应最少，豆科植物的生物量处于中间状态。在物种间，AMF 对植物生物量的影响随着土壤沙含量的增加而增加。在含有四种 AMF 类群混合的土壤中生长的植物物种与仅含有一种 AMF 类群的土壤中的植物物种表现出相似的生长反应。这些结果表明，AMF 类群之间的干扰和土壤沙含量都会引发 AMF 对草地物种植物生产的影响。