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首页> 外文期刊>Open Journal of Ecology >Effects of tree sapling diversity and nutrient addition on herb-layer invasibility in communities of subtropical species
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Effects of tree sapling diversity and nutrient addition on herb-layer invasibility in communities of subtropical species

机译：树苗的多样性和养分的添加对亚热带物种群落草本层入侵的影响

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摘要

Exotic species are assumed to alter ecosystem functioning. However, little is known of the relationships within vertically structured plant communities such as forests, where tree saplings interact with herbaceous species, especially in the early phases of succession. This relationship was tested in a common garden experiment which assessed the impacts on tree saplings and herbaceous species following nutrient addition and the introduction of exotic herb species. The experiment was established in South- East China using four broad-leaved tree species (Elaeocarpus decipiens, Schima superba, Castanea henryi and Quercus serrata) to study the relationships between tree sapling diversity, herb-layer productivity and invasibility. Tree saplings were planted in monoculture and in mixtures of two and four species. A full factorial design was applied, within which species composition was crossed with nutrient and exotic seed-addition treatments. The seed-addition treatment included mixtures of seeds from eight exotic herb species, and herb community attributes were assessed after a four month growing season. Results indicate that certain tree species negatively affect native as well as exotic herbs; however, the high productivity of native herbs had a stronger negative impact on exotic species than tree saplings. Nutrient addition increased the productivity of exotic herbs but had no effect on native herbs. Remarkably, exotic species introduction had a negative feedback effect on the growth of tree saplings, which highlights the potential of exotic herbs to diminish tree recruitment. Although tree saplings reduced invasive effects on the herb-layer during the earliest phase of forest succession, nutrient addition had a more profound and opposite effect on these invaders.
机译：假定外来物种会改变生态系统的功能。但是，人们对垂直结构的植物群落（例如森林）之间的关系知之甚少，在该群落中，树苗与草本物种相互作用，特别是在演替的早期。在一项普通的花园实验中测试了这种关系，该实验评估了添加营养物和引入外来草本物种后对树苗和草本物种的影响。该实验是在中国东南部建立的，使用了四种阔叶树种（Elaeocarpus decipiens，Schima superba，Castanea henryi和Quercus serrata）来研究树苗的多样性，草本层生产力和入侵性之间的关系。树苗以单一栽培和两种和四种的混合物种植。应用了全因子设计，其中物种组成经过营养和外来种子添加处理。种子添加处理包括来自八种外来草本物种的种子混合物，并且在四个月的生长季节后评估了草本植物群落的属性。结果表明，某些树种会对本地和外来草药产生负面影响。然而，本地草药的高生产力比树苗对外来物种的负面影响更大。营养添加增加了外来草药的生产力，但对本地草药没有影响。引人注目的是，外来物种的引入对树苗的生长产生了负面的反馈作用，这突出了外来草药减少树苗募集的潜力。尽管在森林演替的最早阶段，树苗减少了对草本层的侵袭作用，但添加养分对这些入侵者的影响却更大而相反。

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