LATE QUATERNARY VEGETATIONAL HISTORY OF GRAYS LAKE, IDAHO

被引:54
作者
BEISWENGER, JM
机构
[1] Botany Department, University of Wyoming, Laramie
关键词
ARTEMISIA; GRAYS LAKE; HOLOCENE; IDAHO; PALEOECOLOGY; PALYNOLOGY; PLEISTOCENE; POLLEN; QUATERNARY; SEDIMENT;
D O I
10.2307/1943006
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Pollen contained in sediment cores, from Grays Lake, Idaho, indicate cold, dry conditions from almost-equal-to 70 000 to 30 000 yr BP when an Artemisia steppe surrounded Grays Lake and extended into the nearby mountains. From almost-equal-to 30 000 until 11 500 yr BP, somewhat moister conditions supported a conifer woodland. Pinus and other conifers grew in the foothills and among Artemisia on the open plains. Increases in Picea, Abies, and Artemisia signaled the onset of a cool transitional climate almost-equal-to 11 500 yr BP. Juniperus and members of the Chenopodiaceae/Amaranthaceae and Compositae families all became more abundant as the climate became warmer and drier. Xeric conditions persisted from almost-equal-to 10 000 to 7100 yr BP, reaching a maximum almost-equal-to 8200 yr BP. Subsequently, the climate of the Grays Lake Basin has been cooler and moister, with increases in conifers and decreases in Juniperus and steppe plants.
引用
收藏
页码:165 / 182
页数:18
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