入常受到樹冠及枝幹對降雨的再分配(rainfall redistribution)作用(Johnson and Lehmann, 2006)而表現出強烈的不均質性，樹冠結構及枝葉密度對於土壤水分 的空間變異可能是影響含水率空間分布及時間穩定性的重要因子，建議後續 研究可對此進行探討。
(3) 時間穩定性及代表性樣點的分布與坡地區位較為相關。以時間穩定性分析全
年表層含水率資料的結果顯示，代表性樣點多分布於沖蝕溝及谷源中段西側，
邊坡的土壤含水率具有高時間穩定性，其變動趨勢與樣區的平均含水率相似，
但於此區域測得的數值總是低於樣區的平均含水率，而不具有代表性。其中 沖蝕溝的含水率具有強烈的空間變異，不具代表性與具有代表性的樣點分布 區位重疊。建議未來研究避免使用沖蝕溝的測量結果對源頭集水區的平均含 水率進行估計，以減少造成誤差。
(4) 代表性樣點的分布位置會依樣區整體乾濕狀態的不同而變動，樣區較乾燥時，
其分布無明顯的趨勢。當樣區較濕潤時，其分布則向樣區中央集中。
49
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