本研究的目的是以馮、李（2000）GIS方法繪製不同密度的柳杉永久樣區之林木位置圖，配合胸高直徑－樹冠迴歸式繪製樹冠投影圖，觀察其孔隙變化情形，並嘗試由Schnute單株生長模式及其參數變化來探討孔隙對林木生長產生的影響。結果顯示，孔隙變化愈大，其生長潛力愈強及其參數變化愈大，建議無論林分生長模式與單株林木生長模式，宜加入表示孔隙的參數。In the study, the tree location map of 5 different density of permanent sampling plots (PSPs) in Cryptomerria japonica were made with the GIS approach of Feng & Lee (2000) at first. Then, tree crown closure maps were made to investigate the gap chang
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