Environmental Change in the Southwestern Coastal Plain of Taiwan since Late Pleistocene: Using Multiple Proxies of Sedimentary Organic Matter

有機物物地球化學指標看臺灣西南海岸平原晚第四紀環境變遷

顧惠禕(Huei-Wei Ku) ； 陳于高(Yue-Gau Chen) ； 劉聰桂(Tsung-Kwei Liu)

《Terrestrial, Atmospheric and Oceanic Sciences》 16卷5期 (2005/12) Pp. 1079-1096

並列摘要

In an attempt to discriminate between organic matter sources and reconstruct further the paleoenvironment of the southwestern coastal plain of Taiwan, organic carbon and nitrogen content (C/N) ratios and isotope composition (δ13C and δ15N) are measured for sedimentary core samples collected from San-liao-wan, Zai-kang and Yihju in the southwestern coastal plain of Taiwan. Heavy δ13C values (up to -14.3‰) and high C/N ratios (average 9.3) with good correlation indicate that this area underwent a period of relative aridity from early Marine Isotopic Stage (MIS) 2 to the early MIS 1. In MIS 1, the δ13C and C/N ratio both vary initially before later steadying, indicating that the environment became progressively more stable, with C3 plants becoming dominant again. The Zai-kang core appears to have come from a shallow lagoon system that potentially preserved the record of δ15N from autochthonous primary producers. Regional organic source variation is revealed through the high δ15N values and constant C/N ratios in MIS 1 of the Zai-kang core. This may suggest that man- groves and macrophytes were the main aquatic organic matter source in the Zai-kang area during MIS 1.

並列關鍵字

Organic matter ； δ13C ； δ15N ； C/N ratios ； Paleoenvironment ； Coastal plain