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Tolerance to fluctuating water regimes drives changes in mesofauna community structure and vertical stratification in peatlands
Pedobiologia ( IF 2.3 ) Pub Date : 2019-09-01 , DOI: 10.1016/j.pedobi.2019.150571
Raquel Juan-Ovejero , Elena Benito , María Esther Barreal , Javier Rodeiro , María Jesús I. Briones

Abstract Peatlands are the largest natural carbon store as a result of environmental conditions that limit decomposition rates. However, climate change is predicted to threaten peatland C sink function through rising temperatures, lowered water tables and the expansion of vascular plants. Here, by selecting four peatland habitats differing in their dominant plant communities and abiotic conditions, we investigated the influence of the most relevant climatic factors (namely temperature and soil water content) in controlling the spatial and temporal responses of soil organisms and their potential links to above-ground plant functional diversity. We found that the soil mesofaunal communities under vascular plants were mainly dominated by microarthropods (oribatid mites and collembolans), and contrasted with those under mosses that consisted of enchytreids and dipterans (≈15% dissimilarity). We show that the balance of tolerance to drought and saturation determined the temporal dynamics and vertical stratification of the soil invertebrate populations. From this, we anticipate that the projected expansion of vascular plants not only will displace active peat forming vegetation species (mosses), but also those invertebrates that are poorly adapted to the new environment (enchytraeids and dipteral larvae). Our findings indicate future peatland responses to environmental changes should take into account the habitat complexity (above- and below-ground community structure) and the modulating effects of the abiotic environment.

中文翻译:

对波动的水情的容忍驱动了泥炭地中型动物群落结构和垂直分层的变化

摘要 由于限制分解速率的环境条件,泥炭地是最大的天然碳库。然而,预计气候变化将通过温度升高、地下水位降低和维管植物的扩张威胁泥炭地碳汇功能。在这里,通过选择四种主要植物群落和非生物条件不同的泥炭地栖息地,我们研究了最相关的气候因素(即温度和土壤含水量)在控制土壤生物的时空响应方面的影响及其与土壤的潜在联系。地上植物功能多样性。我们发现维管植物下的土壤中动物群落主要以微节肢动物(oribatid mites 和collembolans)为主,并与由 enchytreids 和双翅目组成的苔藓下的那些形成对比(≈15% 不同)。我们表明,对干旱和饱和的耐受性的平衡决定了土壤无脊椎动物种群的时间动态和垂直分层。由此,我们预计维管植物的预计扩张不仅会取代活跃的泥炭形成植被物种(苔藓),还会取代那些不适应新环境的无脊椎动物(内囊虫和双翅目幼虫)。我们的研究结果表明,未来泥炭地对环境变化的反应应该考虑栖息地的复杂性(地上和地下群落结构)和非生物环境的调节作用。我们表明,对干旱和饱和的耐受性的平衡决定了土壤无脊椎动物种群的时间动态和垂直分层。由此,我们预计维管植物的预计扩张不仅会取代活跃的泥炭形成植被物种(苔藓),还会取代那些不适应新环境的无脊椎动物(内囊虫和双翅目幼虫)。我们的研究结果表明,未来泥炭地对环境变化的反应应该考虑栖息地的复杂性(地上和地下群落结构)和非生物环境的调节作用。我们表明,对干旱和饱和的耐受性的平衡决定了土壤无脊椎动物种群的时间动态和垂直分层。由此,我们预计维管植物的预计扩张不仅会取代活跃的泥炭形成植被物种(苔藓),还会取代那些不适应新环境的无脊椎动物(内囊虫和双翅目幼虫)。我们的研究结果表明,未来泥炭地对环境变化的反应应该考虑栖息地的复杂性(地上和地下群落结构)和非生物环境的调节作用。我们预计,维管植物的预计扩张不仅会取代活跃的泥炭形成植被物种(苔藓),还会取代那些不适应新环境的无脊椎动物(内囊虫和双翅目幼虫)。我们的研究结果表明,未来泥炭地对环境变化的反应应该考虑栖息地的复杂性(地上和地下群落结构)和非生物环境的调节作用。我们预计,维管植物的预计扩张不仅会取代活跃的泥炭形成植被物种(苔藓),还会取代那些不适应新环境的无脊椎动物(内囊虫和双翅目幼虫)。我们的研究结果表明,未来泥炭地对环境变化的反应应该考虑栖息地的复杂性(地上和地下群落结构)和非生物环境的调节作用。
更新日期:2019-09-01
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