在地質時間尺度上，矽酸鹽化學風化藉由消耗大氣中的二氧化碳影響全球氣候變遷，因此了解風化過程為重要的課題。河流的化學組成變化能提供來自水岩反應的訊息，為研究矽酸鹽風化的地質材料之一。台灣位於歐亞板塊及菲律賓海板塊交界，屬於年輕造山帶，具有強烈的造山作用，陡峭的坡度和高侵蝕速率使新鮮岩石暴露，進而增加化學風化速率。台灣南部乾濕季分明，不同季節之間懸殊的降雨量造就了截然不同的風化和侵蝕行為。
為釐清不同季節高屏溪流域的風化行為，本研究採集高屏溪流域二月（乾季）及八月（濕季）兩個不同時期、上游至中游不同地點的河水樣品；另外梅雨季節前後(三月至七月)在高屏溪上游新發大橋採集連續時間序列的河水、地下水樣品。我們使用感應耦合電漿光譜儀(ICP-OES)與感應耦合電漿質譜儀(ICP-MS)測定樣本的主要元素濃度和微量元素濃度，樣品經前處理後至無塵室參考過去發表的管柱化學方法進行純化，並以多接收器感應耦合電漿質譜儀(MC-ICP-MS)分析鋰同位素。
結果顯示高屏溪河水溶解相鋰同位素範圍+14.6-+23.0‰，略低於全球河水平均值(+23.0‰)。相較之下，新發大橋連續時間序列樣品鋰同位素變化不明顯(+14.6-+17.0‰)。從元素濃度比值我們發現強降雨事件後地下水和河水明顯混合，配合鋰同位素的數據來看，除了地下水之外，還包含了土壤孔隙水和上游河水的輸入。藉由鋰同位素和風化強度(Weathering intensity)討論高屏溪化學風化在全球尺度下代表的意義，我們發現在高屏溪受到次生礦物的影響顯著，就算強降雨事件時化學風化受到動力學限制也是如此。我們從δ7Li和Li/Ca的關係圖看到了矽酸鹽化學風化的變化，且發現相同時間高屏溪流域的碳酸鹽沉澱和溶解比例相近；儘管採樣點相同也會因為季節不同而有不同的碳酸鹽風化行為，新發大橋強降雨事件前有明顯的碳酸鹽沉澱訊號。進一步用Batch fractionation model評估高屏溪河水，發現次生礦物組成會影響河水鋰同位素分化因子，濕季河流有較強的物理侵蝕速率，水岩反應時間短導致δ7Li較乾季低約1.3-4.5‰。

On geologic time scales, silicate chemical weathering depletes atmospheric CO2, so understanding weathering processes is an important issue. Chemical composition of river water provides information about water-rock reactions and is a useful geological material for studying silicate weathering. Taiwan is located at the junction of Eurasian plate and Philippine Sea plate, which has strong orogenic effects. The steep slope and high erosion rate expose fresh rocks, which increases chemical weathering rate. Southern Taiwan have distinct rainy seasons, and the disparity in rainfall between seasons results in different weathering and erosion behaviors. In order to determine the weathering behavior of Gaoping River catchment in different seasons, samples were collected from the upper to middle reaches of the river during dry (February) and wet (August) seasons. River water and groundwater samples were collected at Xinfa in the middle stream before and after the Asian rainy season (March to July). After pretreatment, the samples were purified in a clean room and analyzed for Li isotopic composition by Multi-Collectors Inductively Coupled Plasma Mass Spectrometry (MC-ICP-MS). The results show that the δ7Li of dissolved load ranges from +14.6 - +23.0‰ in Gaoping River, which is slightly lower than the global average (+23.0‰). In contrast, Li isotopic variation of the continuous time-series samples from Xinfa is not significant (+14.6-+17.0‰). Gaoping River ranges of medium weathering intensity, and its δ7Li is significantly affected by secondary mineral production relative to other rivers in the world. We used Batch fractionation model to assess the influence of the weathering regime on the dissolved δ7Li and found that Li isotopic fractionation factor of the dissolved load was affected by ilmenite and chlorite, two major secondary minerals in Gaoping River. Chemical weathering of rivers in dry season is supply-limited resulting in δ7Li being 1.3-4.5‰ heavier than in wet season.

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