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首页> 外文期刊>Microbial Ecology: An International Journal >Plant Identity Exerts Stronger Effect than Fertilization on Soil Arbuscular Mycorrhizal Fungi in a Sown Pasture
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Plant Identity Exerts Stronger Effect than Fertilization on Soil Arbuscular Mycorrhizal Fungi in a Sown Pasture

机译：播种草场中植物身份对土壤丛枝菌根真菌的作用强于施肥

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Arbuscular mycorrhizal (AM) fungi play key roles in plant nutrition and plant productivity. AM fungal responses to either plant identity or fertilization have been investigated. However, the interactive effects of different plant species and fertilizer types on these symbiotic fungi remain poorly understood. We evaluated the effects of the factorial combinations of plant identity (grasses Avena sativa and Elymus nutans and legume Vicia sativa) and fertilization (urea and sheep manure) on AM fungi following 2-year monocultures in a sown pasture field study. AM fungal extraradical hyphal density was significantly higher in E. nutans than that in A. sativa and V. sativa in the unfertilized control and was significantly increased by urea and manure in A. sativa and by manure only in E. nutans, but not by either fertilizers in V. sativa. AM fungal spore density was not significantly affected by plant identity or fertilization. Forty-eight operational taxonomic units (OTUs) of AM fungi were obtained through 454 pyrosequencing of 18S rDNA. The OTU richness and Shannon diversity index of AM fungi were significantly higher in E. nutans than those in V. sativa and/or A. sativa, but not significantly affected by any fertilizer in all of the three plant species. AM fungal community composition was significantly structured directly by plant identity only and indirectly by both urea addition and plant identity through soil total nitrogen content. Our findings highlight that plant identity has stronger influence than fertilization on belowground AM fungal community in this converted pastureland from an alpine meadow.
机译：丛枝菌根（AM）真菌在植物营养和植物生产力中起关键作用。已经研究了AM真菌对植物身份或施肥的反应。但是，关于这些共生真菌的不同植物种类和肥料类型的交互作用仍然知之甚少。在播种的牧场田间研究中，我们评估了植物身份（草燕麦属植物和披链草和豆科植物豌豆和豌豆豌豆属植物）和施肥（尿素和绵羊粪肥）的因子组合对AM真菌的影响。在未受精对照中，褐斑病菌中AM真菌的根外菌丝密度显着高于A. sativa和V. sativa，尿素和粪便中的尿素和粪肥以及仅E. nutans中的粪便显着增加了AM真菌自由基的菌丝密度豌豆中的两种肥料。 AM真菌孢子密度不受植物身份或施肥的影响很大。通过对18S rDNA进行454焦磷酸测序，获得了AM真菌的48个操作生物分类单位（OTU）。花生中的AM真菌的OTU富集度和Shannon多样性指数显着高于苜蓿和/或苜蓿，但在这三种植物中均不受任何肥料的影响。 AM真菌的群落组成仅通过植物身份直接构成，通过尿素添加和土壤总氮含量通过植物身份间接构成。我们的研究结果突出表明，在这个由高山草甸转化的牧场中，植物身份比施肥对地下AM真菌群落的影响更大。

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