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首页> 外文期刊>Journal of Paleolimnology >Middle and late Holocene climate change and human impact inferred from diatoms, algae and aquatic macrophyte pollen in sediments from Lake Montcortès (NE Iberian Peninsula)
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Middle and late Holocene climate change and human impact inferred from diatoms, algae and aquatic macrophyte pollen in sediments from Lake Montcortès (NE Iberian Peninsula)

机译：从蒙哥尔特斯湖（伊比利亚半岛）沉积物中的硅藻，藻类和水生植物花粉中推断出全新世中期和后期气候变化以及对人类的影响

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During the middle and late Holocene, the Iberian Peninsula underwent large climatic and hydrologic changes, but the temporal resolution and regional distribution of available palaeoenvironmental records is still insufficient for a comprehensive assessment of the regional variability. The high sedimentation rate in karstic, meromictic Montcortès Lake (Catalan pre-Pyrenees) allows for a detailed reconstruction of the regional palaeoecology over the last 5,340 years using diatom analysis, aquatic pollen, sedimentological data, and historic documentary records. Results show marked fluctuations in diatom species assemblage composition, mainly between dominant Cyclotella taxa and small Fragilariales. We suggest that the conspicuous alternation between Cyclotella comta and C. cyclopuncta reflects changes in trophic state, while the succession of centric and pennate species most likely reflects changes in the hydrology of the lake. The diatom assemblages were used to identify six main phases: (1) high productivity and likely lower lake levels before 2350 BC, (2) lower lake levels and a strong arid phase between 2350 and 1850 BC, (3) lake level increase between 1850 and 850 BC, (4) relatively high lake level with fluctuating conditions during the Iberian and Roman Epochs (650 BC–350 AD), (5) lower lake levels, unfavourable conditions for diatom preservation, eutrophication and erosion triggered by increased human activities in the watershed during the Medieval Climate Anomaly (900–1300 AD), and (6) relatively higher lake levels during the LIA (1380–1850 AD) and afterwards. The combined study of diatoms, algae and pollen provides a detailed reconstruction of past climate, which refines understanding of regional environmental variability and interactions between climate and socio-economic conditions in the Pyrenees.
机译：在全新世中期和晚期，伊比利亚半岛经历了较大的气候和水文变化，但是可用的古环境记录的时间分辨率和区域分布仍然不足以对区域变化进行全面评估。喀斯特，淡色的蒙特科尔特斯湖（加泰罗尼亚比利牛斯​​山）的高沉积速率使得过去5340年利用硅藻分析，水生花粉，沉积学数据和历史文献记录对区域古生态进行了详细的重建。结果表明，硅藻物种组成的组成存在明显的波动，主要在优势的小单胞菌分类群和小型脆片之间。我们建议，在小环藻和环孢梭菌之间的明显交替反映了营养状态的变化，而中心和羽状物种的演替很可能反映了湖泊水文学的变化。硅藻组合被用于识别六个主要阶段：（1）高生产力和在公元前2350年之前可能的湖泊水位较低；（2）湖泊水位较低，并且在公元前2350年至1850年之间是干旱的强烈时期，（3）在1850年之间湖泊水位增加和850 BC，（4）伊比利亚和罗马时代（650 BC–350 AD）期间湖水位较高，且条件波动，（5）湖泊水位较低，由于人类活动增加而引起的硅藻保存，富营养化和侵蚀的不利条件中世纪气候异常（900-1300 AD）期间的分水岭，以及（6）LIA（1380-1850 AD）及其后的湖泊水位相对较高。硅藻，藻类和花粉的综合研究提供了过去气候的详细重建，从而加深了对比利牛斯地区环境变化和气候与社会经济条件之间相互作用的理解。

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