Winter warming pulses affect the development of planted temperate grassland and dwarf-shrub heath communities
Winter warming pulses affect the development of planted temperate grassland and dwarf-shrub heath communities
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冬季变暖脉冲影响人工温带草原和矮灌木石南群落的发展
DOI：
10.1080/17550874.2011.558125
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发表时间：
2011
影响因子：
1.5
通讯作者：
C. Beierkuhnlein
中科院分区：
文献类型：
--
作者：
J. Kreyling;G. Jurasinski;Kerstin Grant;V. Retzer;A. Jentsch;C. Beierkuhnlein
背景：由于气候变化，冬季条件发生了很大变化。由此导致的土壤冻融循环（FTC）频率的改变具有生态重要性。目的：我们量化了冬季土壤变暖脉冲对温带植物群落结构的影响。研究方法：维管植物物种的覆盖在两种植被类型，每个在三个多样性水平，记录1年前至3年后，增加了5个额外的FTC的FTC操作。通过线性混合效应模型分析了物种多度模式的变化（Bray-Curtis相似性）。结果：与参考地块相比，暴露于额外FTCs的社区的物种丰度模式变化较小。在第一个生长季节后的FTC操纵和参考地块的FTC操纵后，在草原上的社区发展不同，但随着时间的推移，这种影响消失，而从参考地块的分歧在矮灌木石南开始在第二年后的FTC操纵和影响随着时间的推移而增长。对FTCs的反应与生长形式有关：FTCs操作后，一些草增加，而矮灌木的覆盖减少。有较少的变化，物种多度分布在更多样化的社区与豆类本。结论：冬季气候变化是温带生态系统的关键驱动力。短期气候事件可能对生态系统的结构产生长期影响。群落组成调节土壤变暖脉冲引起的植物群落发展和竞争平衡的变化。
Background: Winter conditions are changing considerably due to climate change. Resulting alterations in the frequency of soil freeze–thaw cycles (FTCs) are ecologically important. Aim: We quantified the impact of winter soil-warming pulses on the community structure of temperate plant communities. Methods: The cover of vascular plant species in two vegetation types, each at three diversity levels, was recorded 1 year before to 3 years after an FTC-manipulation that added five additional FTCs. Changes in species abundance patterns (Bray–Curtis similarity) were analysed by linear mixed effect models. Results: Communities exposed to additional FTCs showed less change in their species abundance patterns than the reference plots. Community development in the grassland differed between the FTC-manipulation and the reference plots in the first growing season after the FTC-manipulation, but such effects disappeared over time, whereas the divergence from the reference plots in the dwarf-shrub heath started in the second year after the FTC-manipulation and effects grew over time. Responses to FTCs were related to growth forms: some grasses increased after the FTC-manipulation, whereas the cover of dwarf shrubs was reduced. There was less change in species abundance distributions in the more diverse communities with legumes present. Conclusions: Winter climate change is a critical driver of temperate ecosystems. Short-term climatic events can have long-term implications on the structure of ecosystems. Community composition regulates alterations in the development and competitive balance of plant communities caused by soil warming pulses.