Pollen record of the penultimate glacial sediments from the Yuchi Basin, Central Taiwan.
Date Issued
2010
Date
2010
Author(s)
Lai, Hsiao-Yin
Abstract
Pollen record of the penultimate glacial period, Core CTN6 in Yuchi Basin, central Taiwan, is studied with an effort to improve our knowledge of this glacial. The core is 29.4 m in length and sampling interval is 10 cm. 146 samples are processed for pollen analysis in total. Three pollen zones (Ⅲ, Ⅱ andⅠ) from lower to upper are assigned according to the ratio of arboreal pollen and non-arboreal (AP/NAP) pollen.
Arboreal pollen dominated in Zone Ⅲ, which consist mainly of Cyclobalanopsis/Querus, Taxodiaceae and Castanopsis. Herbs are generally less than 40%. Zone Ⅱ is characterized by the increase of herbs and temperate elements, like pollen of Taxodiaceae, Symplocos as well as the decrease of Cyclobalanopsis/Querus, Castanopsis, indicating the penultimate glacial period. Finally in ZoneⅠarboreal pollen such as Cyclobalanopsis-Castanopsis increased again and herbs decreased to below 40%, indicating amelioration of climate.
In contrast to the evergreen broadleaved forest found there today, the herbs prevailed assemblage of Zone Ⅱ, represented a relatively drier climate than present. We suggest that the penultimate glacial period is even drier than the last glacial period shown in the record of Toushe Basin according to the lower AP/NAP. This coincided with the result derived from the loess grain analysis in China which indicated that MIS 6 is the driest glacial.
Subjects
Climate
Penultimate glacial
Pollem analysis
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