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Grazing-induced changes in plant–soil feedback alter plant biomass allocation

机译:放牧引起的植物-土壤反馈变化改变植物生物量分配

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摘要

Large vertebrate herbivores, as well as plant–soil feedback interactions are important drivers of plant performance, plant community composition and vegetation dynamics in terrestrial ecosystems. However, it is poorly understood whether and how large vertebrate herbivores and plant–soil feedback effects interact. Here, we study the response of grassland plant species to grazing-induced legacy effects in the soil and we explore whether these plant responses can help us to understand long-term vegetation dynamics in the field. In a greenhouse experiment we tested the response of four grassland plant species, Agrostis capillaris, Festuca rubra, Holcus lanatus and Rumex acetosa, to field-conditioned soils from grazed and ungrazed grassland. We relate these responses to long-term vegetation data from a grassland exclosure experiment in the field. In the greenhouse experiment, we found that total biomass production and biomass allocation to roots was higher in soils from grazed than from ungrazed plots. There were only few relationships between plant production in the greenhouse and the abundance of conspecifics in the field. Spatiotemporal patterns in plant community composition were more stable in grazed than ungrazed grassland plots, but were not related to plant–soil feedbacks effects and biomass allocation patterns. We conclude that grazing-induced soil legacy effects mainly influenced plant biomass allocation patterns, but could not explain altered vegetation dynamics in grazed grasslands. Consequently, the direct effects of grazing on plant community composition (e.g. through modifying light competition or differences in grazing tolerance) appear to overrule indirect effects through changes in plant–soil feedback
机译:大型脊椎动物草食动物以及植物与土壤的反馈相互作用是陆地生态系统中植物性能,植物群落组成和植被动态的重要驱动力。但是,人们对脊椎动物食草动物和植物-土壤反馈作用是否以及如何相互作用的了解很少。在这里,我们研究了草地植物物种对放牧引起的土壤遗留效应的响应,并探讨了这些植物响应是否可以帮助我们了解田间的长期植被动态。在温室实验中,我们测试了四种草场植物,毛果罗汉果(Agrostis capillaris),红景天(Festuca rubra),羊草(Holcus lanatus)和醋栗木(Rumex acetosa)对放牧和未草场草地的田间土壤的响应。我们将这些响应与野外草地暴露实验的长期植被数据联系起来。在温室试验中,我们发现放牧土壤中的总生物量产量和根部生物量分配均高于未耕地的土壤。温室中的植物生产与田间丰富的物种之间只有很少的关系。放牧中的植物群落组成的时空模式比未草化的草地更稳定,但与植物-土壤反馈效应和生物量分配模式无关。我们得出的结论是,放牧引起的土壤遗留效应主要影响植物生物量的分配模式,但不能解释放牧草地中植被动态的变化。因此,放牧对植物群落组成的直接影响(例如,通过改变光照竞争或放牧耐受性的差异)似乎可以抵消植物-土壤反馈的变化所产生的间接影响。

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