Diatom indicators of peatland development at Pogonia Bog Pond, Minnesota, USA

被引:42
作者
Brugam, RB [1 ]
Swain, P
机构
[1] So Illinois Univ, Dept Sci Biol, Edwardsville, IL 62026 USA
[2] Commonwealth Massachusetts, Nat Heritage & Endangered Species Program, Div Fisheries & Wildlife, Westborough, MA 01581 USA
关键词
peatland development; bogs; Minnesota; diatoms; acid-neutralizing capacity; Aulacoseira distans; Aulacoseira perglabra; upper peninsula of Michigan; Holocene;
D O I
10.1191/095968300668251084
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Sediment cores were taken from the central pond and fringing mat of a Sphagnum peatland located in the Big Woods vegetation type. Pollen analysis of the pond core spanning 12 000 cal. BP to the present indicated a mid-postglacial warm period (10 000 to 3900 cal. BP at this site), when the area was covered by open oak woodland and prairie. From 3900 to 300 cal. BP oak forest expanded. At 300 cal. BP (AD 1650) Big Woods species (e.g., Tilia, Ostrya, Ulmus and Acer) increased as a result of 'Little Ice Age' cooling. Diatoms indicating water of high acid-neutralizing capacity (e.g., Stephanodiscus hantzschii) dominated the lake during the mid-Holocene. At 2100 cal. BP these species were succeeded by Aulacoseira distans and A. perglabra, indicating water of low acid-neutralizing capacity and marking peatland initiation. Transfer functions derived from diatoms in surface-sediment samples from Minnesota and the Upper Peninsula of Michigan suggest that this change was associated with reduced acid-neutralizing capacity in Pogonia Bog Pond. This decline was probably caused by peat accumulation around the Pond. The development of peatland at Pogonia Bog is late relative to sites farther north and east, indicating that the climate of the site has become conducive to peat accumulation in the last 2200 years and that the initiation of peatland development represents a time-transgressive boundary that has moved across central North America.
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收藏
页码:453 / 464
页数:12
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