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首页> 外文期刊>The holocene >Long-term ecosystem dynamics of a small lake and its catchment in west Greenland
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Long-term ecosystem dynamics of a small lake and its catchment in west Greenland

机译：格陵兰西部一个小湖泊及其集水区的长期生态系统动态

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We investigated the interplay between climate and the Holocene ecological development of a small low-Arctic lake and its catchment. The remains of terrestrial and aquatic oribatid mites, plant macrofossils, and other invertebrates in a sediment core from Lake SS16 in west Greenland revealed its palaeoecological history over the last 6950 years. Betula nana immigrated into Dryas fell-field and open grassland around 6600 cal. yr BP and then expanded to dominate dwarf-shrub heath that clothed the catchment for 4800 years. Like other lakes in Greenland, the mesotrophic SS 16 became progressively oligotrophic as a consequence of nutrient depletion and reduced runoff from the maturing catchment vegetation. Abrupt declines of Lepidurus arctkus and Daphnia probably reflect the immigration of fish around 6300 cal. yr BP. After c. 2000 cal. yr BP, catchment heathland declined with Neoglacial cooling and reduced precipitation and was replaced by open Dryas grassland vegetation and bare soil. Lake productivity also decreased. The major early-Holocene catchment changes pre-date the aquatic changes, revealing decoupling of ecological responses to climate. In the late Holocene, however, climate change was the predominant driver in both lake and catchment.This multiproxy study shows the valuable contribution made by oribatid mites in the reconstruction of direct processes (e.g. precipitation:evaporation ratio), indirect processes (e.g. nutrient sequestration by maturing tundra vegetation, immigration of taxa), and internal feedbacks (e.g. trophic interactions) that controlled ecosystem development in the past.
机译：我们研究了一个低北极北极湖泊及其流域的气候与全新世生态发展之间的相互作用。格陵兰岛西部SS16湖沉积岩心中的陆地和水生螨虫螨类，植物大型化石以及其他无脊椎动物的遗骸揭示了其过去6950年的古生态历史。西南桦（Betula nana）移入Dryas采伐场，并在6600 cal左右开阔草地。 BP，然后扩展到占主导地位的矮灌木丛，覆盖了流域4800年。与格陵兰岛的其他湖泊一样，中营养型SS 16由于养分耗尽和流域成熟植被的径流减少而逐渐变为贫营养型。 Lepidurus arctkus和Daphnia的突然下降可能反映了6300 cal附近鱼类的迁移。年BP。在c之后2000卡路里在BP时期，流域荒地随着新冰期的冷却和降水的减少而下降，并被开放的Dryas草地植被和裸露的土壤所取代。湖泊生产力也下降了。全新世早期主要集水区变化早于水生变化，揭示了生态学对气候的响应脱钩。然而，在全新世晚期，气候变化是湖泊和流域的主要驱动力。这项多代理研究表明，螨虫螨虫在直接过程（例如降水：蒸发比），间接过程（例如养分固存）的重建中做出了宝贵贡献。通过苔原植被的成熟，分类单元的迁入以及过去控制生态系统发展的内部反馈（例如营养相互作用）。

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