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首页> 外文期刊>Quaternary Science Reviews: The International Multidisciplinary Review Journal >A Lateglacial and Holocene organic carbon isotope record of lacustrine palaeoproductivity and climatic change derived from varved lake sediments of Lake Holzmaar, Germany
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A Lateglacial and Holocene organic carbon isotope record of lacustrine palaeoproductivity and climatic change derived from varved lake sediments of Lake Holzmaar, Germany

机译：冰川湖和全新世有机碳同位素记录，其源于德国霍尔兹马尔湖的成湖湖泊沉积物的古生产力和气候变化

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A composite varve-dated 11.4 m long sediment sequence from Lake Holzmaar, situated in the Eifel region of western Germany, was investigated for total organic matter content, total nitrogen content and stable organic carbon isotopes. Mean time resolution is 75 years for TN and 14 years for delta(13)C(org). On millennial time scales primary production of lacustrine algae strongly depends on the delivery of nutrients from the catchment. The respective carbon isotope record is characterized by marked variations of delta(13)C(org) ranging from -36.0parts per thousand to -27.0parts per thousand and includes a number of pronounced shifts. Reactions of the lacustrine system and the catchment to changes of environmental parameters, e.g. runoff, solar radiation and temperature, induce changes of algal associations and of lacustrine primary production which are reflected in the sediments as carbon isotope variations. Clear evidence of ecosystem reorganizations is detected by the carbon isotope record around 14,200, 10,400, 9600, 5500, 2700, 1700 and 900 varve years BP. In particular, the Holocene events of 9600, around 5500 and 2700 are interpreted as the expression of massive changes of the climate system. The steady rise of delta(13)C(org) values during the mid-Holocene is interpreted as a continuous climatic amelioration reaching an optimum around 6500 varve years BP. Rapid and large changes of delta(13)C(org) values from 2700 varve years BP to the present indicate major disturbances in the catchment area. These are most probably related to deforestation or reforestation and runoff changes, presumably in conjunction with human impact. Carbon isotopes, thus, characterize the Holzmaar ecosystem in time revealing lacustrine palaeoproductivity as well as providing palaeoenvironmental and palaeoclimatic information. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 61]
机译：研究了位于德国西部埃菲尔地区的霍尔茨马尔湖的一条脉长为11.4 m的复合物，研究了总有机物含量，总氮含量和稳定的有机碳同位素。 TN的平均时间分辨率为75年，而delta（13）C（org）的平均时间分辨率为14年。在千禧年的时间尺度上，湖藻藻类的初级生产在很大程度上取决于流域养分的输送。相应的碳同位素记录的特征在于delta（13）C（org）的显着变化范围为千分之36.0至千分之27.0，并且包括许多明显的偏移。湖系和流域对环境参数变化的反应，例如径流，太阳辐射和温度会诱发藻类缔合和湖相初生产物的变化，这些变化以碳同位素变化形式反映在沉积物中。碳同位素记录在BP大约14,200、10,400、9600、5500、2700、1700和900年的碳同位素记录中发现了明确的生态系统重组证据。特别是，9600年，5500年和2700年左右的全新世事件被解释为气候系统发生巨大变化的表现。在全新世中期，delta（13）C（org）值的稳定上升被解释为持续的气候改善，在BP 6500年左右达到了最佳。从2700脉年BP到现在，delta（13）C（org）值的快速且大的变化表明集水区发生了重大扰动。这些很可能与森林砍伐或重新造林以及径流变化有关，大概与人类影响有关。因此，碳同位素及时地表征了荷兹马生态系统，揭示了湖相古生产力，并提供了古环境和古气候信息。 （C）2002 Elsevier ScienceLtd。保留所有权利。 [参考：61]

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