Landscape-scale drivers of glacial ecosystem change in the montane forests of the eastern Andean flank, Ecuador

Landscape-scale drivers of glacial ecosystem change in the montane forests of the eastern Andean flank, Ecuador
复制标题

厄瓜多尔安第斯山脉东侧山地森林冰川生态系统变化的景观尺度驱动因素

DOI:
10.1016/j.palaeo.2017.10.011
复制
发表时间:
2018
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Loughlin N
Loughlin N
中科院分区:
--
文献类型:
--
作者:
Loughlin N

文献摘要

参考文献

被引文献

相似文献

了解末次冰期大尺度扰动事件的影响对于准确重建山地环境的生态系统动力学至关重要。在这里,厄瓜多尔安第斯山脉东侧热带山地云雾林的沉积序列提供了晚更新世期间植被变化(火山事件,火灾制度和草食动物)的非气候驱动因素的作用的证据。沉积物的多指标分析(花粉,非花粉孢粉,木炭,地球化学和碳含量),放射性碳年代测定约。45-42 ka,提供了沉积环境,植被群落和生态系统动态的非气候驱动因素的快照。维尼略斯研究区的地貌、沿着的有机碳含量和水生生物遗骸表明,沉积发生在沼泽或浅水环境中的谷底附近。花粉组合最初主要由草本类型(Poaceae-Asteraceae-Solanaceae)组成,被安第斯森林分类群特征的组合所取代,(首先是Mexalataceae-Weinmannia-Ilex,后来是Alnus-Hedyosmum-Myrica)。花粉组合在厄瓜多尔热带山地云雾林中没有现代类似物。高的微木炭和罕见的宏木炭丰度与火山碎屑沉积物同时发生,表明来自当地以外地区的运输,火山爆发是更广泛的冰川景观中的重要点火源。粪生真菌Sporormiella的存在揭示了食草动物在冰川山地森林景观中的存在。花粉分析表明,一个稳定的区域植被群落,植被人口的变化与大型火山火山灰沉积物的变化,这表明在Vinillos冰川植被的结构是由火山活动驱动的。
Understanding the impact of landscape-scale disturbance events during the last glacial period is vital in accurately reconstructing the ecosystem dynamics of montane environments. Here, a sedimentary succession from the tropical montane cloud forest of the eastern Andean flank of Ecuador provides evidence of the role of non-climate drivers of vegetation change (volcanic events, fire regime and herbivory) during the late-Pleistocene. Multiproxy analysis (pollen, non-pollen palynomorphs, charcoal, geochemistry and carbon content) of the sediments, radiocarbon dated to ca. 45–42 ka, provide a snap shot of the depositional environment, vegetation community and non-climate drivers of ecosystem dynamics. The geomorphology of the Vinillos study area, along with the organic‑carbon content, and aquatic remains suggest deposition took place near a valley floor in a swamp or shallow water environment. The pollen assemblage initially composed primarily of herbaceous types (Poaceae-Asteraceae-Solanaceae) is replaced by assemblages characterised by Andean forest taxa, (first Melastomataceae-Weinmannia-Ilex, and later,Alnus-Hedyosmum-Myrica). The pollen assemblages have no modern analogues in the tropical montane cloud forest of Ecuador. High micro-charcoal and rare macro-charcoal abundances co-occur with volcanic tephra deposits suggesting transportation from extra-local regions and that volcanic eruptions were an important source of ignition in the wider glacial landscape. The presence of the coprophilous fungiSporormiellareveals the occurrence of herbivores in the glacial montane forest landscape. Pollen analysis indicates a stable regional vegetation community, with changes in vegetation population co-varying with large volcanic tephra deposits suggesting that the structure of glacial vegetation at Vinillos was driven by volcanic activity.
使用单熔盘进行 XRF 测定痕量元素和主要元素
DOI: --
发表时间: 1978
期刊:
影响因子: --
作者:
I. Thomas;M. Haukka
通讯作者: M. Haukka
DOI: --
发表时间: 1999
期刊:
影响因子: --
作者:
M. RodrigoSierra
通讯作者: M. RodrigoSierra
安蒂萨纳火山:厄瓜多尔东部山脉的一座代表性安山质火山:岩石学、化学、火山灰和冰川地层学
DOI: --
发表时间: 2017
期刊:
影响因子: --
作者:
M. Hall;P. Mothes;P. Samaniego;A. Militzer;B. Beate;P. Ramón;C. Robin
通讯作者: C. Robin
DOI: --
发表时间: 2012
期刊:
影响因子: --
作者:
Adrian Newton
通讯作者: Adrian Newton
新热带地区的非花粉孢粉形态研究:以委内瑞拉为例
DOI: --
发表时间: 2012
期刊:
影响因子: --
作者:
E. Montoya;V. Rull;T. Vegas
通讯作者: T. Vegas