Plant-plant interactions of Phragmites australis and Suaeda salsa as mediated by combined influences of salinity and tidal level changes
Plant-plant interactions of Phragmites australis and Suaeda salsa as mediated by combined influences of salinity and tidal level changes
复制标题
DOI：
10.1007/s11104-022-05321-8
复制
发表时间：
2022-02-07
期刊：
影响因子：
4.9
通讯作者：
Ma, Chengcang
中科院分区：
文献类型：
--
作者：
Guo, Hongyu;Gao, Fanglei;Ma, Chengcang
目的了解植物-植物相互作用如何在土壤应力梯度上变化，在全球快速变化的情况下变得越来越重要。突出应力梯度假说（SGH）预测植物-植物相互作用的模式沿着只有一个单一的应力梯度。植物-植物相互作用如何在多个共同发生的胁迫因子的联合影响下变化仍然知之甚少。此外，虽然地下植物器官在生态功能中起着关键作用，但关于地下植物-植物相互作用如何在多个土壤梯度中变化却知之甚少。我们评估了SGH的地上，地下和整个植物的相互作用跨越多个共同发生的土壤stress gradient.Methods我们进行了一个围隔实验，以检查植物之间的相互作用的变化芦苇和碱蓬salsa，区分地上，地下和整个植物的相互作用，结果我们的结果仅部分支持SGH，表明一种胁迫因子对植物-植物互作的影响可以被另一种胁迫因子所改变。此外，我们发现了不同的模式，对地下植物植物相互作用。两种植物在不同盐度和潮位梯度下的相互作用受植物对胁迫因子的特异性反应、胁迫因子之间的相互作用以及植物不同的生物量分配策略的影响。一个更好的评估植物群落的动态在复杂的全球变化需要一个明确的理解上下文相关的植物与植物的相互作用，地上和地下器官和跨多个共同发生的压力梯度。
Purpose Understanding how plant-plant interactions vary across soil stress gradients has become increasingly critical given rapid global changes. The prominent stress gradient hypothesis (SGH) predicts patterns of plant-plant interactions along only a single stress gradient. How plant-plant interactions vary under combined influences of multiple co-occurring stress factors is still poorly understood. Moreover, although belowground plant organs play critical roles in ecological functioning, little is known regarding how belowground plant-plant interactions vary across multiple soil gradients. We assessed the SGH for aboveground, belowground and whole plant interactions across multiple co-occurring soil stress gradients.Methods We conducted a mesocosm experiment to examine variation in plant-plant interactions between Phragmites australis and Suaeda salsa, distinguishing aboveground, belowground and whole plant interactions, under the combined influences of salinity and tidal level changes associated with sea level rise.Results Our results only partially supported the SGH, and showed that the effects of one stress factor on plant-plant interactions could be modified by another stress factor. Moreover, we found different patterns of above- versus belowground plant-plant interactions. The plant-plant interactions between the two plant species across salinity and tidal level gradients were influenced by the plants' specific responses to the stress factors, the interplay between the stress factors, and the plants' distinct strategies of biomass allocation.Conclusion Plant-plant interactions in nature might be more complex than simple models suggest. A better assessment of plant community dynamics under complex global changes requires an explicit understanding of context-dependent plant-plant interactions for both above- and belowground organs and across multiple co-occurring stress gradients.