速生草与慢生草对温度和氮限制单独及组合的生长经济学差异

IF 2.2 2区 环境科学与生态学 Q1 Agricultural and Biological Sciences BMC Ecology Pub Date : 2020-11-24 DOI:10.1186/s12898-020-00333-3
Claudia Colesie, Zsofia Reka Stangl, Vaughan Hurry
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引用次数: 2

摘要

背景:快速生长的外来入侵物种是高效的,对其组织的投资很少。它们往往胜过生长较慢的物种,对多样性和群落组成造成严重后果。基于植物经济性状的方法提供了一个理论框架,允许对具有不同性能特征的植物进行分类。然而,在多方面的背景下,这种方法需要测试。在生态相关的环境中,植物性能结果的评估和预测是理解和预测生态系统功能最紧迫的主题之一,特别是在快速变化的环境中。温度和养分有效性是全球环境变化的主要组成部分,本研究考察了入侵型速生草(Bromus hordaceus)和生长缓慢的多年生草(Bromus erectus)的生长经济性状、光合作用和呼吸作用对这些变化的响应。结果:全控制生长室实验模拟了温度和氮有效性的单独和组合变化。因此,我们提供最大限度的控制和监测生长反应,允许测试一般的生长性状反应模式。在最佳氮利用率下,生长缓慢的直立人能够更好地应对较低的温度(7°C),而两种物种在较高的温度(30°C)下都有问题。对生长缓慢的物种来说,热量和养分有效性组合产生的胁迫限制较小,但低温和低养分有效性的组合对两种物种都是最有害的。结论:与生长缓慢的多年生物种直立人相比,快速生长的入侵物种B. hordeaceus的生长性能受到氮有效性降低和温度升高的限制,这可能解释了为什么营养丰富的栖息地往往比资源贫乏的栖息地遭受更多的入侵。
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Differences in growth-economics of fast vs. slow growing grass species in response to temperature and nitrogen limitation individually, and in combination.

Background: Fast growing invasive alien species are highly efficient with little investment in their tissues. They often outcompete slower growing species with severe consequences for diversity and community composition. The plant economics trait-based approach provides a theoretical framework, allowing the classification of plants with different performance characteristics. However, in multifaceted background, this approach needs testing. The evaluation and prediction of plant performance outcomes in ecologically relevant settings is among the most pressing topics to understand and predict ecosystem functioning, especially in a quickly changing environment. Temperature and nutrient availability are major components of the global environmental change and this study examines the response of growth economic traits, photosynthesis and respiration to such changes for an invasive fast-growing (Bromus hordaceus) and a slow-growing perennial (Bromus erectus) grass species.

Results: The fully controlled growth chamber experiment simulated temperature-and changes in nitrogen availability individually and in combination. We therefore provide maximum control and monitoring of growth responses allowing general growth trait response patterns to be tested. Under optimal nitrogen availability the slow growing B. erectus was better able to handle the lower temperatures (7 °C) whilst both species had problems at higher temperatures (30 °C). Stresses produced by a combination of heat and nutrient availability were identified to be less limiting for the slow growing species but the combination of chilling with low nutrient availability was most detrimental to both species.

Conclusions: For the fast-growing invader B. hordeaceus a reduction of nitrogen availability in combination with a temperature increase, leads to limited growth performance in comparison to the slow-growing perennial species B.erectus and this may explain why nutrient-rich habitats often experience more invasion than resource-poor habitats.

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来源期刊
BMC Ecology
BMC Ecology ECOLOGY-
CiteScore
5.80
自引率
4.50%
发文量
0
审稿时长
22 weeks
期刊介绍: BMC Ecology is an open access, peer-reviewed journal that considers articles on environmental, behavioral and population ecology as well as biodiversity of plants, animals and microbes.
期刊最新文献
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