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題 名 | Pollen Analysis of Middle Last Glacial Buried Valley Sediments in the Shanchia Area, Northern Taiwan=臺灣北部山佳地區埋沒谷沉積物在上次冰期中期之花粉分析研究 |
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作 者 | 曾美惠; 劉平妹; | 書刊名 | 中國地質學會會刊 |
卷 期 | 40:4 1997.10[民86.10] |
頁 次 | 頁671-683 |
分類號 | 352.7 |
關鍵詞 | 花粉分析; 上次冰期中期; 山佳; 臺灣北部; Pollen analysis; Middle last glacial; Shanchia; Northern Taiwan; |
語 文 | 英文(English) |
中文摘要 | 為嘗試瞭解更新世晚期的氣候條件,在臺灣北部大漢溪下游山佳地區由河流侵蝕 而出露的埋沒沉積剖面中進行花粉分析研究工作。 此一剖面為約 470 公分厚的河流堆積, 根據前人碳十四定年研究,其沉積年代約在五萬二千年前至三萬一千年前間,正處於上次冰 期的中期。在此,草本植物成份尤其是喜乾性的莎草科和禾本科花粉,占相當重要地位。根 據各花粉屬種在花粉百分含量圖中所占的優勢程度及年代順序,可將沉積剖面由老到新分成 THa、THb、THc 和 THd 等四個花粉帶。 其中 THa 帶以禾本科 - 莎草科 - 松屬 - 赤楊屬 - 剛櫟屬 / 櫟屬 - 杉科最為優勢,而優勢的松屬花粉與同層位中發現的大量松屬樹幹化石 不謀而合,顯現出一涼而乾燥的氣候環境。THb 帶則含有較多的青剛櫟屬 / 櫟屬 - 禾本科 - 莎草科 - 杉科 - 松屬 - 赤楊屬 - 苦櫧屬花粉成份,且苦櫧屬達到此研究剖面的最高百 分率值,表現出一較溫暖的氣候型態,代表上次冰中期時出現的小暖期。THc 帶以莎草科 - 禾本科 - 青剛櫟屬 / 櫟屬 - 杉科 - 松屬 - 赤楊屬 - 苦櫧屬等花粉百分含量占最多,顯 示一較乾燥且較不溫暖的氣候型態。最年輕的 THd 帶以青剛櫟屬 / 櫟屬 - 莎草科 - 禾本 科 - 杉科 - 楓香屬 - 苦諸屬最為優勢,表現出一暖溫型氣候環境,但未如 THb 帶溫暖。 從本研究之花粉百分含量圖中得知,草本植物成份在上次冰期中期時的臺灣北部低地地區占 相當重要的地位,並得知約五萬年前,此地區是一乾燥涼爽的氣候型態,直到三萬七千年前 後,出現一段冰期中的小暖期,而小暖期之後可能有短暫雨量集中的現象。 |
英文摘要 | Pollen analysis was carried out with an attempt to understand the late Pleistocene climatic condition of the lower reach of the Tahanhsi River, northern Taiwan. The samples were collected in a buried valley located at Shanchia, where a section of fluvial deposits of 470 cm in thickness is exposed due to modern river erosion. According to a previous study, this section was formed between 52 ka and 31 ka, belonging to the middle Last Glacial period. Our result demonstrates that the herbaceous pollen elements are predominant, especially of Cyperaceae and Gramineae. Based on dominant percentage, four pollen zones, i.e., THa, THb, THc and THd, have been distinguished in the younging order. Zone THa is dominated by Gramineae-Cyperaceae-Pinus-Alnus -Cyclobalanopsis/Quercus-Taxodiaceae. It is worthy to note that among the woody elements we found dominant Pinaceae pollen in consistence with the occurrence of the same tree trunk fossilk. This implies that the climate was dry and cool at that time. During the time period of Zone THb, the climate was warmer than Zone THa so that its pollen assemblage is characterized by Cyclobalanopsis/Quercus- Gramineae-Cyperaceae-Taxodiaceae-Pinux-Alnus-Castanopsis. Castanopsis here reaches its maximum pollen percentage value in the study section. This means that a little warm period has occurred during the middle Last Glacial period. Zone THc was formed in a drier but less warmer climate than Zone THb, represented by a dominant assemblage of Cyperaceae-Gramineae-Cyclobalanopsis/ Quercus-Taxodiaceae-Pinus-Alnus-Castanopsis. The youngest zone-THd is dominated by Cyclobalanopsis/Quercus-Cyperaceae-Gramineae-Taxodiaceae-Liquidambar- Castanopsis-Alnus, representing a warmer climate than in Zone THc but was less warmer than in Zone THb. Based on our analysis, the herbaceous elements were important around the lowland area of northern Taiwan during the middle Last Glacial period. As a conclusion, in 50 ka the study area was in a dry and cool climate condition. An intermediate interstadial stage occurred around 37 ka, and thereafter the climate turned to a dry condition but with occasional rush rain. |
本系統中英文摘要資訊取自各篇刊載內容。