1. 由杜鵑、扁柏、蘚凋落物之淋洗實驗得知，植物在凋落後之淋洗初期，其所 含高度苯環化之DOC 即大部分被沖淋出來，且其水色深、含較多小分子量、較 親水性的苯環胺基酸，較易被微生物分解；而植物凋落較久所淋洗出的DOC，
以分子量較大、較疏水性、較難被分解的腐植物質為主。在本研究中，淋洗液之 DOC 大部分(約占 75%)為腐植物質。凋落物在淋洗約 400 天時，淋洗液的水色 仍持續波動甚至變深，對照其淋出之DOC 量也呈現相同之趨勢，顯示在鴛鴦湖 湖區的氣候條件下，凋落物腐化分解作用緩慢。在扁柏為優勢植被的鴛鴦湖集水 區，林下的附生植物(如苔蘚類)受酸雨淋洗所產生更酸的淋洗液，可能是使此地 區土壤及湖水偏酸性的主要原因。
2. 由腐植物質萃取實驗及螢光光譜圖(EEMs)得知，湖心表水之 DOC 以外源 性、較親水性之FA 為主。因為鴛鴦湖集水區深厚的有機質層下方為不易滲水的 黏土礦物層，故集水區的水流路徑應大部分為經過表土有機質層而逕流至湖中；
土壤有機質層中含量豐富、較接近湖水分子量的黃腐酸，可能即為湖水DOC 的 重要來源。杜鵑、蘚凋落物之淋洗液，其pH 值、DOC 分子量及螢光光譜(EEMs) 與湖水較為接近，顯示林下灌木或苔蘚等附生植物之淋洗液可能為土壤有機質層 中的黃腐酸的重要來源。
3. 在鴛鴦湖湖區，植物之凋落物在土壤中可能因分解緩慢而大部分變成腐植物 質，儲存於土壤有機質層中；短期之大量降雨可能無法加快凋落物之分解，但可 能從表土的有機質層和附生植物之基質中沖淋出大量的腐植物質(特別是較親水 性的黃腐酸)而流入湖中，因而影響湖水之 pH 值和水色等。鴛鴦湖湖區的降雨量 為影響湖水DOC 濃度、pH 值、水色的重要環境因子之一，這些變量間有高度之
相關性，可由關係式相互推估彼此之值。鴛鴦湖容積小且位於低溫多雨地區，故 雨量對湖水水質的影響大、湖水的更新速率快，特別是颱風帶來大量的降雨經常 造成湖水劇烈的擾動、大量DOC 從鴛鴦湖集水區流出。採集前數天的降雨量較 能反應湖水水質的變動狀況。
4. 在雨量較少、淋洗作用較小時，鴛鴦湖湖水中的內源性、微生物性來源之 DOC (EEMs 圖之 B、T 峰)才較明顯。藻類生長時也會產生類似外源性腐植物質 之DOC (EEMs 圖之 A、C 峰)，但因其在湖水中濃度很低，對湖水 DOC 之影響 不大。影響湖泊之初級生產力暨藻類之生長的因素非常多，本研究之藻類培養試 驗顯示：在營養鹽充足、DOC 濃度為 0~10 ppm 的培養條件下，鴛鴦湖湖水之 DOC 濃度愈高，則愈能促進藻類生長，顯示湖中藻類之數量變化與湖水中 DOC 含量有關。
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