Climate Affects Plant-Soil Feedback of Native and Invasive Grasses: Negative Feedbacks in Stable but Not in Variable Environments
Climate Affects Plant-Soil Feedback of Native and Invasive Grasses: Negative Feedbacks in Stable but Not in Variable Environments
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DOI：
10.3389/fevo.2019.00419
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发表时间：
2019-11-05
影响因子：
3
通讯作者：
Wilson, Gail W. T.
中科院分区：
文献类型：
--
作者：
Duell, Eric B.;Zaiger, Katherine;Wilson, Gail W. T.
植物-土壤反馈框架允许研究人员针对植物和根相关微生物的相互作用，并确定其对植物-植物相互作用的相互作用。陆地生态学中的植物-土壤反馈有很好的文献记载，但反馈的强度和方向受非生物环境因素（如温度和土壤湿度）的影响，尚未得到充分的探讨。在我们的研究中，我们研究了植物土壤的反馈反应，冷，暖季本地和非本地草高温（环境温度和+5 ℃）和土壤水分（100和75%的田间容量）。在之前的实验中，草在与我们目前研究相似的温度和土壤湿度条件下生长。由此产生的训练土壤群落作为我们当前实验的接种源。我们发现，一致的训练和实验温度导致负PSF，植物产生更大的生物量在土壤中的条件下的异质性。然而，当训练和实验条件不匹配时，PSF的方向相反。也就是说，当训练温度和实验温度相互反映时，出现了负PSF，这表明在这些条件下两个物种之间可能共存。然而，当只有训练或测试温度升高，阳性PSF检测，有利于非本地物种。这些变化在植物土壤反馈是相对一致的配对的温暖和冷季型草。总的来说，我们的研究结果表明，不一致的年与年的环境条件，如极端温度，可能会破坏负PSF的稳定力量和有利于非本地草。
The plant-soil feedback framework allows researchers to target the interaction of plants and root-associated microbes and to determine its interplay on plant-plant interactions. Plant-soil feedbacks in terrestrial ecology are well-documented, but the strength and direction of feedbacks as influenced by abiotic environmental factors, such as temperature and soil moisture, has not been fully explored. In our study, we examined plant-soil feedback responses of both cool- and warm-season native and non-native grasses to elevated temperatures (ambient and +5 & DEG;C) and soil moisture (100 and 75% field capacity). In a previous experiment, grasses were grown under temperature and soil moisture conditions similar to our current study. The resultant trained soil communities served as the inoculum sources for our current experiment. We found that consistent training and experimental temperatures resulted in negative PSF, where plants produced greater biomass in soils conditioned by heterospecifics. However, the direction of PSF was reversed when training and experimental conditions were mismatched. That is, when training and experimental temperatures mirrored one another, negative PSF occurred, suggesting coexistence between the two species is likely under these conditions. However, when only training or testing temperatures were elevated, positive PSF were detected, favoring the non-native species. These alterations in plant-soil feedbacks were relatively consistent across pairings of warm- and cool-season grasses. Overall, our results indicate inconsistent year-to-year environmental conditions, such as extreme temperatures, may undermine the stabilizing forces of negative PSF and favor of non-native grasses.