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A mechanism of expansion: Arctic deciduous shrubs capitalize on warming-induced nutrient availability.
Oecologia ( IF 2.3 ) Pub Date : 2020-02-12 , DOI: 10.1007/s00442-019-04586-8
Case M Prager 1, 2, 3 , Natalie T Boelman 4, 5 , Jan U H Eitel 6, 7 , Jess T Gersony 1, 8 , Heather E Greaves 9 , Mary A Heskel 10 , Troy S Magney 11 , Duncan N L Menge 1 , Shahid Naeem 1 , Christa Shen 1 , Lee A Vierling 6, 7 , Kevin L Griffin 1, 4, 5
Affiliation  

Warming-induced nutrient enrichment in the Arctic may lead to shifts in leaf-level physiological properties and processes with potential consequences for plant community dynamics and ecosystem function. To explore the physiological responses of Arctic tundra vegetation to increasing nutrient availability, we examined how a set of leaf nutrient and physiological characteristics of eight plant species (representing four plant functional groups) respond to a gradient of experimental nitrogen (N) and phosphorus (P) enrichment. Specifically, we examined a set of chlorophyll fluorescence measures related to photosynthetic efficiency, performance and stress, and two leaf nutrient traits (leaf %C and %N), across an experimental nutrient gradient at the Arctic Long Term Ecological Research site, located in the northern foothills of the Brooks Range, Alaska. In addition, we explicitly assessed the direct relationships between chlorophyll fluorescence and leaf %N. We found significant differences in physiological and nutrient traits between species and plant functional groups, and we found that species within one functional group (deciduous shrubs) have significantly greater leaf %N at high levels of nutrient addition. In addition, we found positive, saturating relationships between leaf %N and chlorophyll fluorescence measures across all species. Our results highlight species-specific differences in leaf nutrient traits and physiology in this ecosystem. In particular, the effects of a gradient of nutrient enrichment were most prominent in deciduous plant species, the plant functional group known to be increasing in relative abundance with warming in this ecosystem.

中文翻译:

扩张的机制:北极落叶灌木利用变暖引起的养分利用率。

气候变暖引起的北极地区养分富集可能导致叶片水平的生理特性和过程发生变化,并对植物群落动态和生态系统功能产生潜在影响。为了探索北极苔原植被对增加养分利用率的生理响应,我们研究了一组叶片养分和八种植物(代表四个植物功能组)的生理特征如何响应实验氮(N)和磷(P )浓缩。具体来说,我们在位于北极长期生态研究站点的实验性营养梯度上,检查了一组与光合作用效率,性能和胁迫以及两个叶片养分特征(叶%C和%N)有关的叶绿素荧光测量方法。阿拉斯加布鲁克斯山脉的北麓。此外,我们明确评估了叶绿素荧光和叶%N之间的直接关系。我们发现物种和植物功能组之间在生理和营养特性上存在显着差异,并且我们发现,在一个功能组(落叶灌木)内的物种在高水平的营养添加下具有显着更高的叶片%N。此外,我们发现所有物种的叶片%N与叶绿素荧光值之间存在正饱和关系。我们的结果突出了该生态系统中叶片营养性状和生理的物种特异性差异。尤其是,在落叶植物物种中,营养富集梯度的影响最为显着,已知该植物功能群在该生态系统中随着温度的升高而相对增加。我们明确评估了叶绿素荧光和叶%N之间的直接关系。我们发现物种和植物功能组之间在生理和营养特性上存在显着差异,并且我们发现,在一个功能组(落叶灌木)内的物种在高水平的营养添加下具有显着更高的叶片%N。此外,我们发现所有物种的叶片%N与叶绿素荧光值之间存在正饱和关系。我们的结果突出了该生态系统中叶片营养性状和生理的物种特异性差异。尤其是,在落叶植物物种中,营养富集梯度的影响最为显着,已知该植物功能群在该生态系统中随着温度的升高而相对增加。我们明确评估了叶绿素荧光和叶%N之间的直接关系。我们发现物种和植物功能组之间在生理和营养特性上存在显着差异,并且我们发现,在一个功能组(落叶灌木)内的物种在高水平的营养添加下具有显着更高的叶片%N。此外,我们发现所有物种的叶片%N与叶绿素荧光值之间存在正饱和关系。我们的结果突出了该生态系统中叶片营养性状和生理的物种特异性差异。特别是,在落叶植物物种中,营养物富集梯度的影响最为显着,已知该植物功能群在该生态系统中随着温度的升高而相对增加。
更新日期:2020-02-12
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