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題 名 | 宜蘭淇武蘭遺址的孢粉分析研究=Pollen Analysis of the Kiwulan Site, Ilan County, Taiwan |
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作 者 | 林淑芬; | 書刊名 | 經濟部中央地質調查所彙刊 |
卷 期 | 20 2007.07[民96.07] |
頁 次 | 頁1-22 |
分類號 | 356.232 |
關鍵詞 | 孢粉分析; 地理演育; 氣候變遷; 史前聚落; 晚全新世; 宜蘭; Pollen analysis; Physiographical evolution; Climatic change; Prehistoric colonization; Late holocene; Ilan county; |
語 文 | 中文(Chinese) |
中文摘要 | 宜蘭平原由於具有快速沉降的地質條件,提供了辨識高解析率古環境資料的契機。根據淇武蘭遺址的孢粉分析,此地在距今2770-2480年前曾是受到海水影響的河口灣環境,有許多屬於半鹹水相的貝類生存於此,之後隨著海岸線的遠離轉為淡水環境,並在大約2170年前開始成為典型的沼澤濕地,生長著禾本科(Gramineae)及莎草科(Cyperaceae)等草類,然而隨著時間的推移,沼澤濕地慢慢乾涸、消失,大約在1290年前左右,這裡已是類似今日的河間地環境。 由孢粉紀錄中木本花粉百分比與濃度變化資料來看,宜蘭地區在晚全新世仍存在著氣候波動,在2770-2480年前期間是較為冷涼的時期,花粉圖譜中鐵杉屬(Tsuga)花粉較為繁盛,之後氣候逐漸好轉,在2280-2080年前期間是一段較為溫暖的時期,熱帶樹種山龍眼屬(Helicia)大量出現,不過在2170-1450年前期間,宜蘭可能因雨量增加,引發山區的山崩頻繁發生,平地也飽受洪氾之苦,這樣的氣候型態一直到1290年前左右才趨於好轉,此時的淇武蘭由於土地已經穩定,加上氣候溫暖適宜,吸引了屬於下層文化層的人群在此居住與活動,不過到了900年前左右,宜蘭地區的雨量可能再度增加,使得位處低漥的淇武蘭受到洪水襲擊,惡劣的自然環境迫使人群放棄家園,此地的聚落發展因而中斷,一直到大約五、六百年前,屬於上層文化層的人們才又再度回到這裡。 |
英文摘要 | Because of peculiar natural settings, the Ilan Plain provides a unique opportunity to study high-resolution paleo-environment records. Based upon the pollen study of the Kiwulan site, the occurrence of shells of brackish water species probably indicates a fluvial environment near estuaries between 2770 and 2480 cal. B. P. In the following period, the disappearance of brackish shells implies an eastward shifting of the coastline. By 2170 cal. B.P., the remarkable increase in wetland elements suggests the presence of widespread marshlands. However, the expansion of lowland vegetation reflects the development of the fluvial plain around 1290 cal. B.P. The pollen record from the Kiwulan site also reveals clearly climatic fluctuations for the late Holocene. At approximately 2770 to 2480 cal. B.P., the flourishing of Tsuga suggests a relatively cool period prevailed. It is followed by a warm period as indicated by the abundance of Helicia. The notable increase of arboreal pollen concentrations since 2170 cal. B. P. and the flourishing of Alnus soon afterwards suggest an episode of frequent landslides in highlands and floods in lowlands. By 1290 cal. B.P., the decline of Alnus indicates climate amelioration and diminishing of Landslides. The comfortable environment attracted a clan to arrive and establish the Kiwulan site. However, at 900 cal. B.P., heavy rainfall would have had a dramatic impact on this low-lying site. It is quite conceivable that the urban abandonment around 800 years ago would be correlated with the environmental changes. |
本系統中英文摘要資訊取自各篇刊載內容。