期刊
OECOLOGIA
卷 183, 期 1, 页码 211-220出版社
SPRINGER
DOI: 10.1007/s00442-016-3759-2
关键词
Lespedeza cuneata; Prairie; Invasion; Soil microbes; Plant-soil feedback
类别
资金
- Tyson Postdoctoral Fellowship from Tyson Research Center
- National Science Foundation [1103667]
- Alexander von Humboldt Foundation
- Div Of Biological Infrastructure
- Direct For Biological Sciences [1103667] Funding Source: National Science Foundation
Invasive plant species can modify soils in a way that benefits their fitness more than the fitness of native species. However, it is unclear how competition among plant species alters the strength and direction of plant-soil feedbacks. We tested how community context altered plant-soil feedback between the non-native invasive forb Lespedeza cuneata and nine co-occurring native prairie species. In a series of greenhouse experiments, we grew plants individually and in communities with soils that differed in soil origin (invaded or uninvaded by L. cuneata) and in soils that were live vs. sterilized. In the absence of competition, L. cuneata produced over 60% more biomass in invaded than uninvaded soils, while native species performance was unaffected. The absence of a soil origin effect in sterile soil suggests that the positive plant-soil feedback was caused by differences in the soil biota. However, in the presence of competition, the positive effect of soil origin on L. cuneata growth disappeared. These results suggest that L. cuneata may benefit from positive plant-soil feedback when establishing populations in disturbed landscapes with few interspecific competitors, but does not support the hypothesis that plant-soil feedbacks influence competitive outcomes between L. cuneata and native plant species. These results highlight the importance of considering whether competition influences the outcome of interactions between plants and soils.
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