Blanket peat biome endangered by climate change
Blanket peat biome endangered by climate change
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DOI：
10.1038/nclimate1672
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发表时间：
2013-02-01
影响因子：
30.7
通讯作者：
Prentice, I. Colin
中科院分区：
文献类型：
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作者：
Gallego-Sala, Angela V.;Prentice, I. Colin
毯状沼泽是一种非常独特的生物群落，仅限于分离的远洋区域。它的特点是泥炭景观覆盖仅被最陡的斜坡所破坏(1)。植物和微生物适应缺氧、低 pH 值和低养分利用率。植物生产力超过土壤有机质分解，因此碳会随着时间的推移而被封存。独特的气候要求，包括全年降雨量高和夏季气温低(2)，使该生物群落适合生物气候建模。然而，对气候变化下泥炭地、特别是毯状沼泽的总体命运的预测是相互矛盾的(3-7)。在这里，我们使用一个简单、有充分依据的全球生物气候模型(8)，以及七个气候模型的气候变化预测，来表明该生物群落的命运。我们发现其目前的生物气候空间明显缩小，只有少数有限的区域持续存在。因此，气候变化的直接后果是，许多沼泽地区面临着泥炭逐渐侵蚀和植被变化的风险。还预测了适合覆盖沼泽的新区域，但这些区域通常与现有区域分离，并且不同气候模型预测的位置不一致。
Blanket bog is a highly distinctive biome restricted to disjunct hyperoceanic regions. It is characterized by a landscape covering of peat broken only by the steepest slopes(1). Plant and microbial life are adapted to anoxia, low pH and low nutrient availability. Plant productivity exceeds soil organic matter decomposition, so carbon is sequestered over time. Unique climatic requirements, including high year-round rainfall and low summer temperatures(2), make this biome amenable to bioclimatic modelling. However, projections of the fate of peatlands in general, and blanket bogs in particular, under climate change have been contradictory(3-7). Here we use a simple, well-founded global bioclimatic model(8), with climate-change projections from seven climate models, to indicate this biome's fate. We show marked shrinkage of its present bioclimatic space with only a few, restricted areas of persistence. Many blanket bog regions are thus at risk of progressive peat erosion and vegetation changes as a direct consequence of climate change. New areas suitable for blanket bog are also projected, but these are often disjunct from present areas and their location is inconsistently predicted by different climate models.