Essential oil content of Rhododendron tomentosum responds strongly to manipulation of ecosystem resources in Arctic Alaska

IF 2.7 3区地球科学 Q2 ECOLOGY

Arctic Science Pub Date : 2022-02-18 DOI:10.1139/as-2020-0055

Tracey A. Baldwin, S. Oberbauer

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引用次数: 2

Abstract

The essential oils of the widely distributed boreal/Arctic dwarf shrub, Rhododendron tomentosum ssp. subarcticum (Harmaja) G.D. Wallace, have important ecological, cultural, medicinal, and commercial roles. To understand the relationship between resource limitation and essential oil content of this species we measured the amount and diversity of terpenes from shoots of plants exposed to a 14-year ecosystem resource manipulation experiment in Arctic Alaska. Treatments tested interactive effects of nitrogen (N) and phosphorus (P) addition, warming and N + P fertilization, and shading and N + P fertilization. The controls and NP fertilization had the highest essential oil content, whereas shading and P addition had less than 20% of the control content. Warming reduced essential oil content to <65% of that of the controls. Essential oil components varied greatly among the treatments, with significant differences in the expression of specific essential oil components. Large changes in plant community composition and ecosystem structure in response to treatments likely played a large role in the response of R. tomentosum. Our data suggest that resource changes in response to climate warming and its secondary effects on light and nutrient availability have the potential to change the profiles of essential oils in R. tomentosum, with important ecological and cultural impacts.

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北极阿拉斯加毛杜鹃的精油含量对生态系统资源的调控反应强烈

广泛分布的北方/北极矮灌木毛杜鹃的精油。亚北极（Harmaja）G.D.Wallace，具有重要的生态、文化、药用和商业作用。为了了解该物种的资源限制和精油含量之间的关系，我们在阿拉斯加北极地区进行了为期14年的生态系统资源操纵实验，测量了植物枝条中萜烯的数量和多样性。处理测试了氮（N）和磷（P）的添加、升温和施氮的交互作用 + 施磷、遮荫和施氮 + P施肥。对照和NP施肥的精油含量最高，而遮荫和P添加的精油含量不到对照的20%。加温使精油含量降低至 <对照组的65%。不同处理的精油成分差异很大，特定精油成分的表达存在显著差异。植物群落组成和生态系统结构对处理的巨大变化可能在毛白杨的反应中发挥了重要作用。我们的数据表明，气候变暖引起的资源变化及其对光照和养分有效性的次要影响有可能改变毛白杨精油的分布，对生态和文化产生重要影响。

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来源期刊

Arctic Science Agricultural and Biological Sciences-General Agricultural and Biological Sciences

CiteScore

5.00

自引率

12.10%

发文量

期刊介绍： Arctic Science is an interdisciplinary journal that publishes original peer-reviewed research from all areas of natural science and applied science & engineering related to northern Polar Regions. The focus on basic and applied science includes the traditional knowledge and observations of the indigenous peoples of the region as well as cutting-edge developments in biological, chemical, physical and engineering science in all northern environments. Reports on interdisciplinary research are encouraged. Special issues and sections dealing with important issues in northern polar science are also considered.