A record of Lateglacial/Holocene environmental change from a high‐elevation site in the Intermountain West, USA
A record of Lateglacial/Holocene environmental change from a high‐elevation site in the Intermountain West, USA
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DOI：
10.1002/jqs.2600
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发表时间：
2013-01
影响因子：
2.3
通讯作者：
A. Brunelle;T. Minckley;E. Lips;Paul Burnett
中科院分区：
文献类型：
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作者：
A. Brunelle;T. Minckley;E. Lips;Paul Burnett
由于采样地点沉积环境的变化，过去植被和火灾历史的记录可能会变得复杂。然而，这些变化也可以用作气候变化的衡量标准。我们的研究地点，约。 18.0 口径位于雪岭山顶附近的怀俄明州小布鲁克林湖的 ka BP 记录记录了三种湿度状态。最初，该湖很可能是一个由冰川供水的池塘，这表明盘星藻群落的存在。 13.0 卡路里左右ka BP 后，该池塘转变为草甸环境，这表明盘星藻菌落的消失和沉降速度缓慢。草地条件一直维持到大约。 5.0 卡路里ka BP 当盘星藻群体丰度增加时，表明浅湖的形成。从 18.0 到大约。 5.0 卡路里ka BP，花粉记录表明高山植被条件具有相对较高的云杉和草本类群。木炭流入量低也是 18.0 至 5.0 cal 之间时期的特征。卡BP。 5.0 卡路里后ka BP，浅湖形成和花粉数据的巧合，表明向云杉和冷杉森林的转变，表明有效湿度的增加。然而，在整个记录中，该盆地的火灾仍然很少见，一旦湖泊形成沉积速度并且木炭流入量增加。版权所有 © 2013 约翰·威利父子有限公司
Records of past vegetation and fire history can be complicated by changes in the depositional environment of a sampling location. However, these changes can alternatively be used as a measure of climate variability. Our study site, ca. 18.0 cal. ka BP record from Little Brooklyn Lake, Wyoming, located near the crest of the Snowy Range, records three moisture states. Initially, the lake was likely a glacier‐fed pond indicated by the presence of Pediastrum algae colonies. Around 13.0 cal. ka BP this pond transitioned to a meadow environment, suggested by the loss of Pediastrum algae colonies and slow sedimentation rates. Meadow conditions were maintained until ca. 5.0 cal. ka BP when Pediastrum algae colony abundance increased,indicating the formation of a shallow lake. From 18.0 to ca. 5.0 cal. ka BP, the pollen record is suggestive of alpine vegetation conditions with relatively high spruce and herbaceous taxa. Low charcoal influx also characterizes the period between 18.0 and 5.0 cal. ka BP. After 5.0 cal. ka BP, the coincidence of the formation of shallow lake and pollen data, indicating a shift to a spruce and fir forest, suggests an increase in effective moisture. Fire remained rare in this basin over the entire record, however, once the lake established sedimentation rates and charcoal influx increased. Copyright © 2013 John Wiley & Sons, Ltd.