Heather Moorland Vegetation and Air Pollution: A Comparison and Synthesis of Three National Gradient Studies

Heather Moorland Vegetation and Air Pollution: A Comparison and Synthesis of Three National Gradient Studies
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希瑟荒原植被和空气污染:三个国家梯度研究的比较和综合

DOI:
10.1007/s11270-014-1998-6
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发表时间:
2014
期刊:
Water, Air, & Soil Pollution
影响因子:
--
通讯作者:
Payne R
Payne R
中科院分区:
--
文献类型:
--
作者:
Payne R

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大规模的空间梯度研究越来越多地用于了解空气污染的影响,并制定适当的保护和政策反应,但我们从这些调查中得出的结论有多一致?在这里,我们解决这个问题,通过比较三个独立的梯度研究,从同一个栖息地,英国石楠高沼地。我们协调和重新分析了这些调查中与累积氮沉降、硫沉降和其他潜在驱动因素有关的植被数据,并利用这些结果评估空气污染对该栖息地的可能影响。在绝大多数分析中,空气污染变量比其他变量更能解释物种丰富度和组成的差异。由于强相关性,很难解开氮和(遗留)硫沉降的相对贡献,但氮沉降目前可能是变化的主要驱动力。物种丰富度与氮沉降之间的负相关关系具有一致性,但由于样本量较小,这种关系的形式存在一定的变异性。在所有调查中,被确定为与氮沉降正相关或负相关的物种具有高度的一致性,没有证据表明存在系统性差异。我们的结论是,在宽梯度相对较小的调查可以提供有用的信息多样性的潜在驱动因素,以及确定敏感和宽容的物种。我们的研究结果强烈表明,氮沉降对英国石楠高沼地的生物多样性产生了严重而广泛的影响,并导致植物群落的变化,包括促进至少一种入侵物种的传播。
Large-scale spatial gradient studies are increasingly used to understand the impacts of air pollution and devise appropriate conservation and policy responses, but how consistent are the conclusions we draw from these surveys? Here, we address this question by comparing three independent gradient studies from the same habitat, UK heather moorlands. We harmonise and re-analyse vegetation data from these surveys in relation to cumulative nitrogen deposition, sulphur deposition and other potential drivers and use these results to assess the possible impacts of air pollution in this habitat. Air pollution variables explain more variance in species richness and composition than other variables in the vast majority of analyses. Untangling the relative contribution of nitrogen and (legacy) sulphur deposition is difficult due to strong correlation, but it is likely that nitrogen deposition is currently the dominant driver of change. There is consistency in the negative correlation between species richness and nitrogen deposition, but some variability in the form of this relationship due to small sample sizes. Across surveys there is a high degree of consistency in species identified as either positively or negatively correlated to nitrogen deposition, and no evidence for systematic differences. We conclude that relatively small surveys across wide gradients can provide useful information on potential drivers of diversity, as well as identify sensitive and tolerant species. Our results strongly suggest that nitrogen deposition has a severe and widespread impact on the biodiversity of British heather moorlands and is causing changes in plant communities, including promoting the spread of at least one invasive species.
英国社区植物,第 2 卷:泥沼和荒地:J.S. Rodwell 编辑,剑桥大学出版社,1991 年。 95.00 英镑/195.00 美元 hbk(x + 628 页)ISBN 0 521 39165 2
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