植物物种的生态位分化和扩展与菌根共生相关,Journal of Ecology

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植物物种的生态位分化和扩展与菌根共生相关
Journal of Ecology ( IF 5.3 ) Pub Date : 2017-10-23 , DOI: 10.1111/1365-2745.12873
Maret Gerz ₁ , C. Guillermo Bueno ₁ , Wim A. Ozinga _{2,

3} , Martin Zobel ₁ , Mari Moora ₁

Affiliation

菌根共生是植物根与菌根真菌之间的广泛关联，据认为这有助于植物生态位的分化和扩展。但是，到目前为止，尚未对此进行明确测试。
为了解决菌根共生对植物已实现的生态位的影响，我们研究了菌根状态（即菌根共生的发生频率），柔韧性（即有和没有菌根共生时的生长能力）和植物种类如何影响实现的利基最佳化，宽度和体积。为此，我们使用了来自荷兰植物区系的共生数据，包括土壤肥力，湿度，pH，盐度，光照和温度梯度。使用系统发育广义最小二乘模型考虑了物种的系统发育依赖性。
我们表明，兼性和灵活的菌根植物分别比非菌根和专性菌根植物和不灵活的植物具有最宽的生态位。在专性植物共生体中，与其他菌根类型的植物相比，外胚根和类固醇菌根植物表现出最宽的生态位。同样，具有不同菌根状态和类型的植物在实现的生态位最佳方面也有所不同。
综合。我们的结果表明，菌根共生介导了植物生态位的分化和扩展，促进了对植物物种当前分布模式的理解，并预测了由于环境变化而引起的植物分布和优势的转移。

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Niche differentiation and expansion of plant species are associated with mycorrhizal symbiosis

Mycorrhizal symbiosis is a widespread association between plant roots and mycorrhizal fungi, which is thought to contribute to plant niche differentiation and expansion. However, this has so far not been explicitly tested.
To address the effect of mycorrhizal symbiosis on plants’ realized niches, we addressed how mycorrhizal status (i.e. the frequency of occurrence of mycorrhizal symbiosis), flexibility (i.e. the ability to grow both with and without mycorrhizal symbiosis) and type of a plant species affect the realized niche optima, widths and volumes. For this, we used co‐occurrence data from the flora of the Netherlands along soil fertility, moisture, pH, salinity, light and temperature gradients. Phylogenetic dependency of the species was taken into account using phylogenetic generalized least squares models.
We show that facultatively and flexibly mycorrhizal plants have the widest niches compared to non‐mycorrhizal and obligately mycorrhizal, and inflexible plants respectively. Among obligate plant symbionts, ecto‐ and ericoid mycorrhizal plants exhibited the widest niches compared to plants with other mycorrhizal types. Also, plants with different mycorrhizal statuses and types differed in their realized niche optima.
Synthesis. Our results indicate that mycorrhizal symbiosis mediates plant niche differentiation and expansion, facilitating the understanding of current distribution patterns of plant species, as well as predicting shifts in plant distribution and dominance due to environmental changes.

更新日期：2017-10-23

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