福衛二號在林相與林況監測之應用：以馬公島為例

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Title:	福衛二號在林相與林況監測之應用：以馬公島為例
Other Titles:	Monitoring Forest Cover and Stand Condition Using FORMOSAT-2: An Example of the Ma-Kong Island
Authors:	許立達李載鳴
Contributors:	森保系
Keywords:	福衛二號造林地林相林況
Date:	2006-06
Issue Date:	2010-11-18 10:15:33 (UTC+8)
Abstract:	本研究應用2005年福衛二號衛星影像辨識澎湖馬公島之林相，並比較造林地之林況差異。在林相方面，馬公島主要林相包括木麻黃爲主的造林地與銀合歡，光譜特徵分析結果顯示近紅外光波段最能區分林相之不同，銀合歡在各波段之光譜反射均十分均質，易於與造林地區分，媳體分類精度達77%；造林地不同林分結構可能會有相似的光譜特徵，顯示福衛二號衛星影像在複層林判釋上仍有困難。在林況方面，各造林地之NDVI植生指標有很大的變異，復舊造林因爲保肖部份舊立木，而內陸軍區造林地因爲地況較佳，兩老林均況較佳；北向及東向之林地，以及海岸距海岸愈近之防風林，則林況較差，顯示東北季風吹襲可能爲影響馬公島林木林況的主因之一。 This study used FORMOSAT-2 satellite imagery taken in July, 2005 to distinguish forest cover types and to compare stand conditions of forestations on the Ma-Kung Island, Peng-Hu County. The major forest cover types on the island include Leucaena glauca stands and man-made forestations dominated by Casuarina. In terms of forest cover classification, results showed that Leucaena glauca stands have a very distinct reflectance pattern in the satellite imagery, and can be easily distinguished from other land covers. Comparisons of reflectance patterns showed that the near-infrared band is more useful in distinguishing forest types. The reflectance of Leucaena glauca stands is quite homogeneous, and can be easily distinguished from man-made forestation with 77% total accuracy. In contrast, different forest structures could have similar reflectance patterns, indicating a limited applicability of FORMOSAT-2 satellite imagery in classifying multilayer forests. In terms of NDVI, high variations also existed in different forestations. Stands on reforestation land and in-land military land generally have better stand condition due protection of remaining trees and more favorable land condition respectively. In contrast, forestations facing north or east, and coastal windbreaks nearer to sea shore, have poorer stand condition, suggesting that seasonal wind from the northeast could be one of the primary factors affecting the forest condition on the island.
Relation:	華岡農科學報 17期 P.1-12
Appears in Collections:	[森林暨自然保育學系 ] 期刊論文

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