劉平妹2006-07-252018-06-282006-07-252018-06-282005http://ntur.lib.ntu.edu.tw//handle/246246/11865為了解在低偉東亞季風區上次間冰期(伊緬期Eemian)的冷熱與乾濕變化狀況，及 與歐洲的異同點，以更了解現世間冰期，於是研究台灣中部古湖沼沉積上次間冰 期之孢粉層序。參考已有的約每兩米間距採樣的WK Ⅰ及WK Ⅱ的岩心分析結 果，以及該岩心附近出露的剖面每十公分間距採樣分析，討論伊緬期此處的沉積 及氣候狀況。早期以代表亞熱帶的苦櫧屬居多，但代表乾燥的禾本科亦相當重 要。中期苦櫧仍優勢，禾本科減少。晚期苦櫧仍多，較特殊的是千金榆屬增加到 成為主要植物，草本也增加。指示氣候從早期的暖乾變到中期的暖濕，接下來到 晚期轉乾涼。變化趨勢可與歐洲對比。千金榆屬在歐洲的伊緬期中期時廣泛的分 佈，此地則是最早伊緬期即將開始時一度繁盛，之後遲至伊緬期晚期時才大量增 加，可能是因為到伊緬期晚期氣候再度轉冷，千金榆屬分佈向南撤退到低緯。千 金榆屬在歐亞的廣泛分佈指示上次間冰期時緯向氣候分異度較現世間冰期為 低。此外伊緬期早期暖乾的趨勢與全新世間冰期的早期暖濕有所不同。In an effort to understand the Holocene Interglacial, the natural forcing of climate change, pollen stratigraphy of the last interglacial – Eemian in central Taiwan, is studied. We integrate the palynological result of the sediments in both outcrop and drillings at the northern part of Yuchi Basin where Eemian deposits are anticipated based on previous palynological study and the available dates in the profile. The result shows that both Castanopsis and Gramineae are important in the early stage of Eemian; Gramineae decline in the middle part of this stage and finally in the late stage Carpinus and Gramineae increase in addition to the still prevailing of Castanopsis. This sequence indicates the conditions from warm dry in early stage to warm humid in middle stage and then to the relative cool - dry in late stage. The general feature of the climatic trend is similar to Europe although with still small fluctuations here. The warm dry climatic conditions in early Eemian is different from that of the early Holocene in this area and the widely distributed Carpinus during Eemian. indicates the less steep latitudinal gradient of climate compared with Holocene.application/pdf284750 bytesapplication/pdfzh-TW國立臺灣大學地質科學系暨研究所上次間冰期伊緬期孢粉層序湖沼沉積千金榆Last interglacialEemianpollen stratigraphyLake depositsCarpinusreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/11865/1/932116M002032.pdf