Late Holocene environmental change and human impact inferred from three soil monoliths and the Laguna Zurita multi-proxi record in the southeastern Ecuadorian Andes
Late Holocene environmental change and human impact inferred from three soil monoliths and the Laguna Zurita multi-proxi record in the southeastern Ecuadorian Andes
复制标题
从厄瓜多尔安第斯山脉东南部的三块土壤巨石和 Laguna Zurita 多代理记录推断全新世晚期环境变化和人类影响
DOI：
10.1007/s00334-009-0226-6
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发表时间：
2009
影响因子：
2.5
通讯作者：
H. Behling
中科院分区：
文献类型：
--
作者：
H. Niemann;H. Behling
本文介绍了厄瓜多尔东南部安第斯山脉的里奥圣弗朗西斯科河谷上游的晚全新世植被、气候、山地森林和帕拉莫生态系统的火动力学以及人类活动的影响。通过花粉、孢子和木炭分析，结合X射线荧光光谱和磁性磁化率扫描，研究了从海拔梯度在1 990米至3 200米之间的三块土壤整料推断出的古环境变化，以及从拉古纳阿蒂塔（2 590米）获得的高分辨率多代理沉积物记录。四个花粉记录中的三个显示出在约1000年至约2000年之间植物区系组成的显著变化。900和350 cal b. p.（内插年龄）。过去的火灾强烈影响了山地雨林生态系统的植物区系组成。频繁的火灾，加上相对较高的草和一些玉米种植园的发生记录过去的人类活动在上里约圣弗朗西斯科山谷。可能是古代Z的大量地区。利用基于地理信息系统的计算，确定了里约圣弗朗西斯科河谷上游的玉米种植。莎草科和Isoprene的高发生率表明，沼泽湖岸的发展，在拉古纳阿西塔湖水位较低的反应前约。700 cal b. p.后，Isoptera和莎草科植物的减少。1200 cal b. p.反映了由于湿度增加和/或人类活动造成的湖平面上升。
Late Holocene vegetation, climate and fire dynamics of mountain forest and paramo ecosystems, as well as human impact, are presented from the upper Rio San Francisco valley, southeastern Ecuadorian Andes. Palaeoenvironmental changes, inferred from three soil monoliths, spanning an altitudinal gradient between 1,990 and 3,200 m and the high resolution multi-proxy sediment record from Laguna Zurita (2,590 m), were investigated by pollen, spore and charcoal analyses, in combination with XRF- and magnetic susceptibility-scanning. Three of the four pollen records show a marked change in the floristic composition between ca. 900 and 350 cal b.p. (interpolated age). Past fires have strongly influenced the floristic composition of the mountain rainforest ecosystem. Frequent fires, together with the relatively high occurrence of grasses and some Zea mays plantations document past human activities in the upper Rio San Francisco valley. A large number of areas of probably ancient Z. mays cultivation in the upper Rio San Francisco valley has been identified, using GIS-based calculation. High occurrences of Cyperaceae and Isoetes indicate the development of marshy lake shores in response to a lower lake level at Laguna Zurita before ca. 700 cal b.p. The decrease of Isoetes and Cyperaceae after ca. 1200 cal b.p. reflects a lake level rise, due to increasing moisture and/or human activities.
影响因子：
56.9
作者：
Lamy, F;Kaiser, J;Stoner, J
通讯作者：
Stoner, J