Contrasting effects of intra- and interspecific identity and richness of ectomycorrhizal fungi on host plants, nutrient retention and multifunctionality.

Contrasting effects of intra- and interspecific identity and richness of ectomycorrhizal fungi on host plants, nutrient retention and multifunctionality.
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外生菌根真菌的种内和种间同一性和丰富度对寄主植物、养分保留和多功能性的影响对比。

DOI:
10.1111/nph.14184
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发表时间:
2017
期刊:
The New phytologist
影响因子:
--
通讯作者:
Hazard C
Hazard C
中科院分区:
--
文献类型:
--
作者:
Hazard C

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我们对生物多样性与生态系统功能关系的理解存在一个主要差距,即菌根真菌种内和种间多样性的作用,这对于植物适应度、生物地球化学循环和其他过程至关重要。在这里,我们检验了一个假设,即种内和种间水平的外生菌根(ECM)真菌的特性和丰富度通过调节植物和真菌的生产力、土壤CO2排放和养分保持来影响生态系统的多功能性。(Pinus sylvestris)幼苗被不同的ECM真菌分离物定殖,在单一培养物和混合物中,种内和种间同一性对植物和真菌的生产力和养分保持率有适度但显著的影响,但对CO2排放量没有影响。种内丰富度增加植物根系生产力和ECM根尖,但降低菌丝长度,而种间丰富度没有影响。种间混合物在只有10%的情况下优于最具生产力的单一栽培,相比之下,种内混合物为42%。ECM真菌的种内和种间身份和丰富度调节生态系统的多功能性,但它们对个体变量的方向和幅度的影响不同。越界的丰产表明,积极的生态位互补效应正在推动一些种内丰富度的反应。
A major gap in our understanding of biodiversity–ecosystem function relationships concerns the role of intra‐ and interspecific diversity of mycorrhizal fungi, which are critical for plant fitness, biogeochemical cycling and other processes. Here, we test the hypothesis that the identity and richness of ectomycorrhizal (ECM) fungi at the intra‐ and interspecific levels affect ecosystem multifunctionality by regulating plant and fungal productivity, soil CO2efflux and nutrient retention.Microcosms containing Scots pine (Pinus sylvestris) seedlings colonized by different ECM fungal isolates, in monocultures and mixtures, enabled us to test for both intra‐ and interspecific identity and richness effects, and transgressive overyielding.Intra‐ and interspecific identity had modest but significant effects on plant and fungal productivity and nutrient retention, but no effect on CO2efflux. Intraspecific richness increased plant root productivity and ECM root tips but decreased hyphal length, whereas interspecific richness had no effects. Interspecific mixtures outperformed the most productive monocultures in only 10% of the cases, compared with 42% for the intraspecific mixtures.Both intra‐ and interspecific identity and richness of ECM fungi regulate ecosystem multifunctionality, but their effects on the direction and magnitude of individual variables differ. Transgressive overyielding suggests that positive niche complementarity effects are driving some of the responses to intraspecific richness.
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