比較水平樣點取樣法與一致高取樣法於人工林材積估計之效率

Abstract

木材是重要的經濟來源，以往多半以定面積樣區取樣法搭配材積式或材積表計算估計材積，然材積式會受建立時的資料影響產生估計偏差，故需尋求更有效率且準確的方法。本研究比較水平樣點取樣法（HPS）搭配材積式以及一致高取樣法（CHS）在估計臺灣地區柳杉與臺灣杉人工林之材積上的效率，結果顯示使用CHS得到的材積估計值不會隨材積式有所波動，且耗時較短，可提升取樣之效率。

Timber is an important source of income. In the past, the sampling method of fixed-area plots was used to calculate the estimated volume with the volume equation or volume table. However, the volume equation will be affected by the data at the time of establishment, resulting in estimation deviation. Therefore, it is necessary to seek a more efficient and accurate method. This study compared the efficiency of horizontal sampling (HPS) combined with volume equation and critical height sampling (CHS) in estimating the volume of Cryptomeria japonica and Taiwania cryptomerioides plantations in Taiwan. It turns out that the result of CHS didn’t fluctuate with the volume equation and took less time during the survey, which can improve the efficiency of sampling.