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首页> 美国卫生研究院文献>Ecology and Evolution >Community‐level plant–soil feedbacks explain landscape distribution of native and non‐native plants
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Community‐level plant–soil feedbacks explain landscape distribution of native and non‐native plants

机译：社区一级的植物-土壤反馈可解释本地和非本地植物的景观分布

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Plant–soil feedbacks (PSFs) have gained attention for their potential role in explaining plant growth and invasion. While promising, most PSF research has measured plant monoculture growth on different soils in short‐term, greenhouse experiments. Here, five soil types were conditioned by growing one native species, three non‐native species, or a mixed plant community in different plots in a common‐garden experiment. After 4 years, plants were removed and one native and one non‐native plant community were planted into replicate plots of each soil type. After three additional years, the percentage cover of each of the three target species in each community was measured. These data were used to parameterize a plant community growth model. Model predictions were compared to native and non‐native abundance on the landscape. Native community cover was lowest on soil conditioned by the dominant non‐native, Centaurea diffusa, and non‐native community cover was lowest on soil cultivated by the dominant native, Pseudoroegneria spicata. Consistent with plant growth on the landscape, the plant growth model predicted that the positive PSFs observed in the common‐garden experiment would result in two distinct communities on the landscape: a native plant community on native soils and a non‐native plant community on non‐native soils. In contrast, when PSF effects were removed, the model predicted that non‐native plants would dominate all soils, which was not consistent with plant growth on the landscape. Results provide an example where PSF effects were large enough to change the rank‐order abundance of native and non‐native plant communities and to explain plant distributions on the landscape. The positive PSFs that contributed to this effect reflected the ability of the two dominant plant species to suppress each other's growth. Results suggest that plant dominance, at least in this system, reflects the ability of a species to suppress the growth of dominant competitors through soil‐mediated effects.
机译：植物土壤反馈（PSF）因其在解释植物生长和入侵方面的潜在作用而受到关注。尽管有希望，但大多数PSF研究都通过短期温室试验测量了不同土壤上植物单株栽培的生长。在这里，通过在一个普通花园试验中在不同地块种植一种本地物种，三种非本地物种或混合植物群落来调节五种土壤类型。 4年后，将植物移走，并将一种原生和一个非原生植物群落种植到每种土壤类型的重复样地中。再过三年后，对每个社区中三个目标物种的覆盖率进行了测量。这些数据用于参数化植物群落生长模型。将模型预测与景观上的自然和非自然丰富度进行比较。在以优势非本地种白花变种为条件的土壤上，土著社区覆盖率最低，而在优势本地Pseudoroegneria spicata种植的土壤上，非本地社区覆盖率最低。与景观上的植物生长一致，植物生长模型预测，在普通花园实验中观察到的阳性PSF会在景观上产生两个不同的群落：原生土壤上的原生植物群落和非原生植物上的非原生植物群落。本地土壤。相反，当去除PSF效应后，该模型预测非本地植物将主导所有土壤，这与景观上植物的生长不一致。结果提供了一个示例，其中PSF效应足够大，可以改变本地和非本地植物群落的等级数量，并可以解释景观中植物的分布。促成这种作用的阳性PSF反映了两种优势植物物种抑制彼此生长的能力。结果表明，至少在这个系统中，植物的优势反映了一个物种通过土壤介导的作用抑制主要竞争者生长的能力。

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