建議

1. 標定資料的離散性對於各 TDR 量測土壤乾密度與含水量方法有很 大影響，因此於標定時，應注意標定資料之離散程度，否則將出現 無法接受誤差。

2. 土壤種類、水質導電度與乾溼循環等影響因子對 TDR 估計土壤乾密 度與含水量方法有相當程度影響，因此，於量測前，建議對待測土 壤進行系統標定，再進行量測，否則將出現無法接受之誤差。

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附錄一 TDR 估計乾密度與含水量方法 求解推導

傳統視介電常數與導電度分析法

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(i)由(1)式除以(2)式，可得：

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將其移項整理，可得：

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√ √ (A- 1) (ii)將(1)式 d 與(2)式 b 相減，可得：

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將其移項整理，可得：

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(A- 2)