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Plant-soil feedbacks under resource limitation may not contribute to the invasion by annual Asteraceae plants.
Oecologia ( IF 2.7 ) Pub Date : 2020-09-15 , DOI: 10.1007/s00442-020-04756-z
Ya Wang 1 , Guangyan Ni 2 , Yuping Hou 3 , Qinke Wang 1 , Qiaoqiao Huang 1
Affiliation  

Changes in resource availability can alter plant growth, the influence of plants on soil characteristics, and, ultimately, plant–soil feedback (PSF). Previous studies often show that invasive plants can outperform native plants under high but not low resource conditions. However, it remains unclear whether under low resource conditions, invaders can outperform natives in the long term by generating more positive or less negative PSFs. Using three non-native invasive and three non-invasive native annual Asteraceae plants, we conducted a two-phase pot experiment, where in the first, conditioning generation plants were grown to induce changes in soil characteristics, and in the second, bioassay generation plants were regrown to evaluate how they respond to these soils. Half of the pots received a nutrient addition treatment in the conditioning generation. We found significant species-specific effects of conditioning on most of the soil characteristics, and some soil characteristics were significantly correlated with bioassay generation biomass of a subset of species, but neither species nor invasive or native status affected bioassay generation biomass. All invasive species generated neutral PSFs across soil nutrient conditions. The native Emilia sonchifolia tended to condition the soil that favored its own growth more than others, and under low nutrient conditions, the native Eclipta prostrata conditioned the soil that disfavored its own growth more than others. These results indicate that invaders may not outperform natives through PSFs under low resource conditions, and increasing resource availability may change the types of PSFs for some native but not invasive plants.



中文翻译:

在资源有限的情况下,植物土壤的反馈可能不会导致一年生菊科植物的入侵。

资源可用性的变化会改变植物的生长,植物对土壤特性的影响,最终改变植物-土壤的反馈(PSF)。先前的研究通常表明,在资源丰富但条件不低的条件下,入侵植物的性能要优于本土植物。但是,目前尚不清楚,在资源匮乏的情况下,入侵者能否通过产生更多的阳性或更少的阴性PSF来长期胜过本地人。我们使用3种非本土入侵植物和3种非入侵本土一年生菊科植物进行了两阶段盆栽试验,其中第一类是生长条件生成植物以诱导土壤特性的变化,第二种是生物分析生成植物长大后评估它们如何应对这些土壤。一半的盆在调理阶段接受了营养添加处理。我们发现调节对大多数土壤特征具有显着的物种特异性影响,并且某些土壤特征与物种的一部分的生物测定产生生物量显着相关,但是无论物种还是入侵或自然状态都不会影响生物测定产生生物量。所有入侵物种在土壤养分条件下均产生中性PSF。本地人 所有入侵物种在土壤养分条件下均产生中性PSF。本地人 所有入侵物种在土壤养分条件下均产生中性PSF。本地人Emilia sonchifolia倾向于对土壤有利于自身生长,而在低营养条件下,原生Eclipta prostrata对土壤不利于自身生长。这些结果表明,在资源匮乏的情况下,入侵者可能不会通过PSF超越本地人,并且增加的资源可用性可能会改变某些本地但非入侵植物的PSF类型。

更新日期:2020-09-15
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