臺灣大學實驗林神木村樟樹與鹿林紅檜巨木初探：樹高及樹冠層附生植物多樣性調查

A Preliminary Investigation of the Giant Shenmu Camphor Tree and Lulin Formosan Cypress in the Experimental Forest of National Taiwan University: the Tree Height and Epiphytic Plants

徐嘉君(Rebecca Chia-Chun Hsu) ； 王驥魁(Chi-Kuei Wang) ； 李崇誠(Chung-Cheng Lee) ； 陳建文(Chien-Wen Chen)

《國立臺灣大學生物資源暨農學院實驗林研究報告》 35卷1期 (2021/03) Pp. 1-8

https://doi.org/10.6542/EFNTU.202103_35(1).0001

摘要

林務局在1999年根據胸圍大小公布臺灣的十大神木，本研究針對臺大實驗林轄區內排名第2的鹿林神木、跟第8的樟公神木，進行樹冠層的攀樹調查、與光達和空拍機3D建模。量測結果樟公神木的樹高是48公尺，而鹿林神木為54公尺，樟公神木除了是臺灣最大的闊葉樹以外，也是世界最高的樟樹，並由研究團隊登錄至世界神木網站，樟公跟鹿林神木的樹冠層分別記錄了32與31種維管束植物，包含幾種稀有的附生植物。研究顯示，內政部地政司的空載光達資料2D順向坡剖面圖，精確地估算了樹高，故其它巨木的樹高也可考慮採用此方法估計；此外空拍機3D建模最能展示神木的樹冠層之美，經費也較為低廉，且量測的精確度也足以一般森林經營所需，不過地面光達量測仍保有最多的細節，更可達公釐等級的精確度，對於已經全株中空、立地危險的樟公神木來說，留下地面光達的測計資料，可讓後人保有深入研究的機會。

關鍵字

森林樹冠層 ； 神木 ； 樹高測計 ； 空拍機建模 ； 維管束附生植物

並列摘要

We climbed and investigated canopies of two monumental trees (the Giant Camphor and LuLin) in the experimental forest of National Taiwan University that have been listed in the top ten thickest trees in Taiwan. The Giant Camphor tree (Cinnamomum camphora) is the thickest broadleaf tree, and LuLin is the second thickest red cypress (Chamaecyparis formosensis) in Taiwan. Using data from Taiwan Department of Land Administration (TLA), we produced vertical profile from airborne LiDAR point clouds of these two trees. Based on the manual tape measurements, the tree height of the Giant Camphor was 48 m, and LuLin as 54 m that were consistent with the LiDAR vertical profile, indicating the potential for using existing data set of TLA to estimate heights of giant trees in remote mountain areas. Given that the Giant Camphor tree was believed the tallest camphor tree in the world, we registered it in the international website of monumental tree. We recorded 32 and 31 vascular epiphytic plants, including rare species, from The Giant Camphor and LuLin, respectively. Results showed accurate estimates of tree height using the 2D vertical LiDAR profile provided by the Department of Land Administration of the Ministry of the Interior, R.O.C. (Taiwan). As a result, this method may be applied to estimate the tree heights of other giant trees. In addition, the unmanned aerial vehicle (UAV) 3D model can best demonstrate the beauty of the giant tree's canopy and provides accurate measurements needed for forest management with lower budgets. Nonetheless, the ground-based LiDAR measurements can retain the most details in millimeter accuracy. For the hollow Giant Camphor situating in the unsafe land, the ground-based LiDAR records will provide opportunities for in-depth research in the future.

並列關鍵字

forest canopy ； monumental trees ； tree height measurement ； UAV 3D model ； vascular epiphyte