第六章 第六章
第六章 結論 結論 結論 結論
本研究顯示塔塔加鞍部臺灣雲杉不同方位之樹液流速有明顯差異，均以上坡 處之樹液流速最快；深層樹液流速之差異隨著邊材深度增加有先降後升之現象，
使得樹液流速隨邊材深度增加而減少之現象不明顯。因此在估算樹液流量上，忽 略樹液流之邊材方向變異所造成之樹液流量估算差異較忽略邊材深度影響來的大，
與一般研究結果不同。
臺灣雲杉夏季流速最大值可達 16.25 cm3m-2s-1；春、夏月均樹液流速差異不大。
與鴛鴦湖臺灣扁柏樹液流速比較結果，發現月均溫為造成兩地月平均樹液流速差 異之原因之一。在冠層環境上，塔塔加鞍部臺灣雲杉冠層之 VPD 於午夜至凌晨間 增加，至清晨 6 時左右達最大值後開始下降，並於中午接近 0，此狀況與鴛鴦湖地 區相似，推測皆為雲霧帶環境造成之結果。在樹液流速與 VPD 之關係方面，可能 因生長環境較潮溼，使臺灣雲杉之白晝平均樹液流速達到飽和之 VPD 較德國地區 之挪威雲杉來的小。
基本上，臺灣雲杉儲存水之消耗主要在上午，而下午開始為儲存水之補充。
夏季之儲存水使用量較冬季大，每日平均儲存水消耗量較其他文獻中胸徑較小之 針葉樹種相似或較少，每日儲存水消耗量與總樹液流量之比例也有相似狀況。經 過時間遲滯之比較，臺灣雲杉之遲滯時間亦較其他研究之針葉樹種為短，且遲滯 時間通常以夏季較大，冬季較小，可能與儲存水之消耗有關。
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附表 3 樣木 TMid 樹液流時間遲滯數值表。時間遲滯之單位為小時，數值為不同 高度單位樹液流之相關係數
Tmid -3 -2.5 -2 -1.5 -1 -0.5 0
Spring 0.41 0.52 0.62 0.72 0.81 0.89 0.94 Summer 0.37 0.48 0.59 0.69 0.79 0.87 0.94 Fall 0.27 0.37 0.47 0.57 0.67 0.76 0.84 Winter 0.44 0.48 0.52 0.56 0.59 0.62 0.65
Tmid 0.5 1 1.5 2 2.5 3
Spring 0.97 0.96 0.93 0.88 0.81 0.73 Summer 0.96 0.95 0.91 0.84 0.76 0.67 Fall 0.89 0.91 0.91 0.89 0.84 0.77 Winter 0.65 0.65 0.64 0.63 0.61 0.58
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附圖 1. 阿里山地區自 1999-2012 之環境因子時間動態
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（（（（
a
）） （）） （（（b
））））（（（（
c
）） （）） （（（d
））））附圖 2. TM1 冠層與林內氣象站與 TM1 冠層 HOBO 溫、濕度之線性迴歸，（a）20 m 測點與 TM1 冠層 HOBO 溫度線性迴歸，（b）20 m 測點與 TM1 冠層 HOBO 相對 濕度線性迴歸，（c）1.5 m 測點與與 TM1 冠層 HOBO 溫度線性迴歸，（d）1.5 m 測 點與 TM1 冠層 HOBO 相對濕度線性迴歸
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附圖 3. 夏季樹液流與各環境因子之時間動態
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附圖 4. 冬季樹液流與各環境因子之時間動態
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附圖 5. Clausnitzer 等人（2011）之挪威雲杉樣區環境因子時間動態