A multiproxy record of late Holocene natural and anthropogenic environmental change from the Sphagnum peat bog Dürres Maar, Germany: implications for quantitative climate reconstructions based on pollen
A multiproxy record of late Holocene natural and anthropogenic environmental change from the Sphagnum peat bog Dürres Maar, Germany: implications for quantitative climate reconstructions based on pollen
复制标题
德国都拉斯玛尔泥炭沼泽的全新世晚期自然和人为环境变化的多代理记录：对基于花粉的定量气候重建的影响
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
O. Peyron
中科院分区：
文献类型：
--
作者：
N. Kühl;R. Moschen;S. Wagner;S. Brewer;O. Peyron
花粉数据是建立在长期的定量气候重建，包括全新世和更古老的间冰期。然而，在过去的4万年，在中欧的气候变化是强大的，这段时间的定量重建的挑战。在这里，我们提出了定量的气候重建的基础上花粉分析和评价泥炭腐殖化记录和泥炭藓植物材料的稳定碳同位素（δ 13 C纤维素）。所有的分析都是在Dürres Maar的相同的7.5 m长，主要是湿营养泥炭沼泽部分进行的。三种不同的方法用于定量气候重建的花粉数据的基础上：（1）概率指示类群的方法（pdf方法）;（2）现代模拟技术的基础上花粉类群从现代表面样品（cMAT）;（3）现代模拟技术扩展植物功能类型（pMAT）。在Dürres Maar，泥炭腐殖化作用仅在罗马时期和中世纪受到泥炭切割的影响。稳定的碳同位素似乎不受人类影响。因此，这两个代理提供独立的数据，以评估重建的花粉数据的基础上。基于各种方法的定量气候重建总体上是比较相似的。尽管如此，各种方法之间的明显差异也很明显，这可能归因于反映人类对地方到区域规模影响的分类群。虽然pdf方法似乎对所有观测到的气候变化引起的植被变化都相对稳健，但它可能低估了气候变率。因此，这种方法预计将是独立的当地网站的特点，并提供可靠的气候趋势，而不是小幅度的气候变异性的定量估计。这是旧间冰期的古气候重建的价值，其中既没有多个站点，也没有独立的气候代理进行比较。版权所有© 2009约翰威利父子有限公司。
Pollen data are well established for quantitative climate reconstructions over long timescales, including the Holocene and older interglacials. However, anthropogenically induced environmental change in central Europe was strong during the last 4 ka, challenging quantitative reconstructions of this time period. Here we present quantitative climate reconstructions based on pollen analyses and evaluate them with the peat humification record and the stable carbon isotopes of Sphagnum plant material (δ13Ccellulose). All analyses were carried out on the same 7.5 m long, largely ombrotrophic peat bog section from Dürres Maar. Three different methods were used for the quantitative climate reconstructions on the basis of the pollen data: (1) a probabilistic indicator taxa approach (the ‘pdf method’); (2) a modern analogue technique based on pollen taxa from modern surface samples (cMAT); and (3) a modern analogue technique expanded by plant functional types (pMAT). At Dürres Maar the peat humification is only affected by peat cutting during the Roman period and the Middle Ages. The stable carbon isotopes are seemingly unaffected by human impact. Thus both proxies provide independent data to evaluate the reconstructions on the basis of pollen data. The quantitative climate reconstructions on the basis of the individual methods are in general relatively similar. Nevertheless, distinct differences between the individual approaches are also apparent, which could be attributed to taxa that reflect human impact on a local to regional scale. While the pdf method appears to be relatively robust to all observed anthropogenically induced vegetation changes, it potentially underestimates climate variability. This method is therefore expected to be independent of local site characteristics and to provide robust quantitative estimates of climatic trends rather than of climatic variability of small amplitude. This is of value for palaeoclimate reconstructions of older interglacials, for which neither multiple sites nor independent climate proxies are available for comparison. Copyright © 2009 John Wiley & Sons, Ltd.