A multi-proxy study of lake-development in response to catchment changes during the Holocene at Lochnagar, north-east Scotland
A multi-proxy study of lake-development in response to catchment changes during the Holocene at Lochnagar, north-east Scotland
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DOI：
10.1016/j.palaeo.2005.02.007
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发表时间：
2005-06-09
影响因子：
3
通讯作者：
Thompson, R
中科院分区：
文献类型：
--
作者：
Dalton, C;Birks, HJB;Thompson, R
本文介绍了在苏格兰东部高地Lochnagar进行的一项多岩心湖泊沉积物研究，利用花粉、硅藻和手拟虫，以及磁学和沉积物生物地球化学作为生物和非生物代用指标，推断了全新世湖泊发育对环境变化的响应。硅藻被用来推断pH值，摇虫被用来推断温度，花粉和植物巨化石作为独立的代理来验证这些记录，并为流域植被和土壤的变化提供见解。脂质生物标志物为其提供湖泊生产力的额外信息的潜力进行了探索。结果表明，燃烧损失（LOI）记录的波动非常明显，与一些生物（chironomid head-capsule浓度）和非生物（粗粉土粒度分数、脂质和氯组分）变量的变化相一致。由土壤发育和退化引起的流域驱动变化，以及陆地流域植被的自然演替和人为干预对硅藻和盘尾藻组合的影响最大。这些集水过程导致了湖水的自然酸化。工业化后的湖泊酸化对湖泊生物区系也有影响。气候驱动的温度变化对生物类群的影响似乎很弱，在大约2600 cal. yr BP时，冷、窄、热性手摇虫类群在响应全新世早期变暖时减少，而嗜热性手摇虫类群在响应变冷时减少。(c) 2005年Elsevier B.V.出版
This paper describes a multi-core lake sediment study using pollen, diatoms, and chironomids, together with magnetics and sediment biogeochemistry, as biotic and abiotic proxies to infer lake development in response to environmental change during the Holocene at Lochnagar in the eastern Highlands of Scotland. Diatoms are used to infer pH, chironomids to infer temperature, with pollen and plant megafossils acting as an independent proxy to validate these records and to provide insights into changes in catchment vegetation and soils. Lipid biomarkers are explored for their potential to provide additional information on lake productivity. The results indicate highly distinctive fluctuations in the loss-on-ignition (LOI) record, which are in phase with changes in some biotic (chironomid head-capsule concentration) and abiotic (coarse silt particle size fraction, and lipid and chlorine fractions) variables. Catchment-driven changes due to the development and degredation of soils, and the natural succession and human intervention on terrestrial catchment vegetation have the strongest influence on the diatom and chironomid assemblages. These catchment processes resulted in the natural acidification of the lake water. Post-industrial acidification of the lake was also influential on the lake biota. Climate-driven temperature change appears to have had only a weak influence on the biota with declines in cold stenothermic chironomid taxa in response to Early Holocene warming and declines in thermophilic chironomids in response to cooling at about 2600 cal. yr BP. (c) 2005 Published by Elsevier B.V.