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首页> 外文期刊>Ecological Complexity >Impacts of seven years of experimental warming and nutrient addition on neighbourhood species interactions and community structure in two contrasting alpine plant communities
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Impacts of seven years of experimental warming and nutrient addition on neighbourhood species interactions and community structure in two contrasting alpine plant communities

机译：七个试验性变暖和养分添加对两个不同的高山植物群落邻域物种相互作用和群落结构的影响

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摘要

Global change is predicted to have major impacts on alpine and arctic ecosystems. Plant fitness and growth will be determined by how plants interact with each other at smaller scales. Local-scale neighbourhood interactions may be altered by environmental pertubations, which could fundamentally affect community structure. This study examined the effects of seven years of experimental warming and nutrient addition on overall changes in the community structure and patterns of interspecific interaction between neighbouring plant species in two contrasting alpine plant communities, mesic meadow and poor heath, in subarctic Sweden. We used a network approach to quantify the dissimilarity of plant interaction networks and the average number of interspecific neighbourhood interactions over time in response to different environmental perturbations. The results revealed that combined warming and nutrient addition had significant negative effects on how dissimilar plant interaction networks were over time compared with the control. Moreover, plant-plant neighbourhood interaction networks were more dissimilar over time in nutrient-poor heath than in nutrient-rich mesic meadow. In addition, nutrient addition alone and combined nutrient addition and warming significantly affected neighbourhood species interactions in both plant communities. Surprisingly, changes in interspecific neighbourhood interactions over time in both communities were very similar, suggesting that the nutrient-poor heath is as robust to experimental environmental perturbation as the mesic meadow. Comparisons of changes in neighbouring species interactions with changes in evenness and richness at the same scale, in order to determine whether diversity drove such changes in local-scale interaction patterns, provided moderate evidence that diversity was behind the changes in local-scale interspecific neighbourhood interactions. This implied that species might interact at smaller scales than those at which community measures were made. Overall, these results demonstrated that global change involving increased nutrient deposition and warming is likely to affect species interactions and alter community structure in plant communities, whether rich or poor in nutrients and species. (C) 2017 Elsevier B.V. All rights reserved.
机译：预计全球变化将对高山和北极生态系统产生重大影响。植物的适应性和生长将取决于植物在较小规模下如何相互作用。当地的邻里互动可能会因环境干扰而改变，这可能从根本上影响社区结构。这项研究检查了七年的实验性增温和营养添加对瑞典亚北极两个不同的高山植物群落（中度草甸和荒地）群落结构和种间种间相互作用模式总体变化的影响。我们使用一种网络方法来量化植物相互作用网络的不相似性，以及随着时间的推移，不同环境干扰对种间邻里相互作用的平均数量。结果表明，与对照相比，加温和添加营养相结合对不同时间的植物相互作用网络的显着负面影响。而且，随着时间的流逝，营养贫瘠的荒地上的植物－植物邻域相互作用网络比营养丰富的中生草甸更为相似。此外，单独添加养分以及结合添加养分和变暖对两个植物群落中的邻近物种相互作用都产生了显着影响。令人惊讶的是，两个社区的种间邻里相互作用随时间的变化非常相似，这表明营养贫乏的荒地对实验性环境扰动与草甸草甸一样健壮。为了确定多样性是否驱动了局部尺度相互作用模式的这种变化，比较了相邻物种相互作用与相同尺度上的均匀度和丰富度变化的比较，提供了适度的证据表明多样性是局部尺度种间邻里相互作用的变化背后的原因。这意味着与采取社区措施的物种相比，物种的相互作用规模可能较小。总体而言，这些结果表明，涉及营养物沉积和变暖的全球变化可能会影响物种相互作用并改变植物群落中的群落结构，无论养分和物种的丰富与否。 （C）2017 Elsevier B.V.保留所有权利。

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