六龜地區臺灣杉人工林生長模式之建立

森林調查與測計是森林數量化經營之基礎，研究者常藉由取樣、建模、推估之方式，取得森林經營所須之量化資訊，其中，區域性之樹高曲線式、立木材積式及林分直徑分布等模式之建立，為人工林經營之基礎。本研究以林業試驗所六龜試驗林42年生之臺灣杉為研究對象，以不同徑級之30株伐倒樣木資料，配適樹高曲線式及立木材積式。結果顯示，適合用於推估之樹高曲線式及立木材積式分別為H=-3.6988+7.0735×ln DBH及V=DBH^2 / [348.7+(25541/H)]，模式之均方根誤差值分別為2.375 m及0.075 m^3，二者之表現尚佳。此外，本研究以9個20 × 25 m之樣區每木調查資料，以3參數之Weibull機率密度函數，運用直徑分布法推估全林分蓄積量及碳貯存量，本林分之每公頃蓄積量及碳貯存量分別為680.0 m^3 ha^(-1)及132.8 Mg ha^(-1)。研究所得之結果可提供人工林數量化經營之資訊。

關鍵字

臺灣杉；樹高曲線式；立木材積式；直徑分布法；韋伯機率密度函數

並列摘要

Forest survey and measurement are the basis of forest quantitative management. Researchers obtain quantitative information by sampling, modeling and estimation. Stand diameter distribution model and the regional allometric models such as tree height and volume equations are the basis of plantation management. We used 30 felled sample trees with different diameter classes to fit the tree height and volume equations for the 42-year-old Taiwania plantation of Liukuei experimental forest managed by Taiwan Forestry Research Institute. The results showed the model of H=-3.6988+7.0735×ln DBH , RMSE=2.375 m and V=DBH^2 / [348.7+(25541/H)], RMSE=0.075 m^3 have better effectiveness. In addition, the survey data of individual trees in 9 20 × 25 m plots and the diameter distribution approach with 3-parameter Weibull probability density function were used to estimate the stand volume stock in the study area. The estimated volume and carbon storage of Taiwania were around 680.0 m^3 ha^(-1) and 132.8 Mg ha^(-1), respectively. The results provide quantitative information for plantation management.

並列關鍵字

Taiwania (Taiwania cryptomerioides) ； Tree height equation ； Volume equation ； Diameter distribution approach ； Weibull probability density function

國際替代計量

六龜地區臺灣杉人工林生長模式之建立

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