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題名 | Organic Carbon Freight of a Subtropical Mountainous River (Lanyang Hsi) in Taiwan=臺灣高山小河流(蘭陽溪)之有機碳通量 |
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作者 | 高樹基; | 書刊名 | 海軍軍官學校學報 |
卷期 | 6 1996.10[民85.10] |
頁次 | 頁49-69 |
分類號 | 351.983 |
關鍵詞 | 臺灣; 蘭陽溪; 有機碳通量; Lanyang Hsi; POC; Sediment yield; Carbon flux; Riverine system; |
語文 | 英文(English) |
中文摘要 | 陸地向海洋輸出之碳通量對於全球碳通量的平衡推算是非常重要的,近年來開始 重視小河流(包括臺灣),因為其沉積物與顆粒有機碳單位面積產值非常高,同時數目眾多 。蘭陽溪位於臺灣東北部,兩量豐富屬於典型的亞熱帶高山發源小河流。在1993-1994年間 對於蘭陽溪主流以及支流做了顆粒有機碳及懸浮沉積物的測量,結果顯示全流域的沉積物產 值非常高,然而支流較不受人為擾動過的流域產值則非常低。根據同位素加速器定年決定顆 粒有機碳之表觀年齡,多老於10000年,顯示百分之七十的有機碳可能來自地層中的老有機 碳。根據水利局歷史資料顯示在1975-1980產業道路開發後,沉積物產值增加約2.7倍,而背 景值則增加約30位。因此推論主要主流以及支流間沉積物產值之差異來自於人為開發,而大 多的有機碳來自於地層而非來自於生態系統。 |
英文摘要 | The terrigenous carbon flux to the ocean is an important factor in balancing the carbon budget there. Small mountainous rivers (including those in Taiwan) have received increasing attention in recent years because of their high yield of sediments and particulate organic matter as well as their large number. Lanyang Hsi is a typical small mountainous river in the subtropical northeastern Taiwan with high precipitation (30000mm yr-1). A one-year (1993-94) study of the fluxes of the total suspended matter (TSM) and particulate organic carbon (POC) in different parts of the river indicates that the mean TSM and POC yields of the whole drainage area were indeed very high (3700 ��1500 and 23 ��7 g m-2 yr-1, respectively). By contrast, the TSM and POC yields in watersheds of relatively undisturbed tributaries were much lower. Radiocarbon analysis by accelerator mass spectrometry gave very old apparent ages (>10000 yr.) to the POC in the main channel, indicating that more than 70% of the POC produced in the drainage basin was probably derived from kerogen in the bedrock. The mean TSM yields calculated with bistorical records increase by a factor of 2.7 after massive road construction in 1975-1980. And the background yield increase by a factor of 30 from 100 to 3000 g m-2 yr-1. Therefore, it is concluded that the high yields of sediments and POC in Lanyang Hsi drainage area is attributable to human activity. Under undisturbed condititons, the sediment and POC fluxes from small mountainous rivers may be lower and the POC increase may mostly be from the erosion of ancient sedimentary carbon rather than from ecosystem export. |
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