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標題: | 福山試驗林之景觀分類、植被分佈推估與變遷評析 Landscape classification, vegetation distribution estimation, and change analysis of Fushan Experimental Forest |
作者: | Mei-Ling Bai 白梅玲 |
出版年 : | 1999 |
學位: | 碩士 |
摘要: | 長期生態研究(Long-Term Ecological Research,LTER)強調自更長的時間與更廣的空間著眼,以瞭解生態系的長期現象與過程。福山試驗林是臺灣最早成立的長期生態研究站之一;為了促進資料整合與延伸研究尺度,本研究結合前人的研究成果,利用地理資訊系統與衛星遙測影像,先構建福山試驗林的環境資料庫,並進行景觀分類,瞭解環境因數的空間分佈特性;其次分析植被樣區資料,並進行分佈模式的推估,探討植被的空間分佈;最後以衛星影像導得之常態化差值植生指數(Normalized Difference Vegetation Index, NDVI),加入時間軸上的分析,探討四季變化以及颱風等幹擾力對生態系的影響。 景觀分類的結果,顯示福山試驗林的環境異質性相當高;各景觀類型的環境特色、空間分佈、植被組成、NDVI 及其變化率等均不相同,故在日後研究中應個別探討並分析其間的關係,才能正確組合出整個生態系的全貌。在植被分析的部份,本研究顯示福山試驗林的植物社會主要隨地形位置的起伏而變化,樹種出現與否則亦受到南北地理位置的影響。而由1994至1997年衛星影像的分析發現,福山試驗林四季的NDVI值呈夏季最高、冬季最低的季節性變化;在冬春間有最高的成長,秋冬間則有最顯著的下降;颱風是重要的幹擾因數,在沒有颱風的年份,NDVI可持續增長至初秋;若有颱風發生,會影響次年的整體表現,且約需要兩年以上才能完全復元;而就個別颱風而言,由於福山的地形變化複雜,其幹擾有很大的空間變異。 本研究所構建的環境資料庫,可用於萃取環境變數並建立尺度間的聯結;景觀分類的結果,可成為日後研究分層取樣時的參考,並做為資料整合的單位;植被分佈推估可與動物的研究聯結,並建立相關的生態模式;而衛星影像提供了重要的生態系資訊,應長期蒐集以監測環境的變遷,並進行不同研究站間的比較。 Fushan Experimental Forest is one of the five long-term ecological research (LTER) sites in Taiwan. To investigate the landscape characteristics of Fushan, I studied the landscape classification, vegetation distribution pattern and Normalized Difference Vegetation Index (NDVI) changes from SPOT imageries. An environmental database, including many topographic and vegetation variables, was established in a geographic information system (GIS). The database was used in landscape classification using cluster analysis. Vegetation analysis was then conducted on 53 stands using TWINSPAN, detrended correspondence analysis (DCA) and canonical correspondence analysis (CCA), and vegetation distribution pattern over the entire area was predicted by discriminant function analysis. Satellite-derived NDVIs from 1994 to 1997 were used to explore seasonal landscape changes and the effects of typhoon disturbance. The result of landscape classification shows that Fushan is highly heterogeneous. Each landscape type differs in the environmental characteristics, vegetation composition, and NDVI values. Vegetation composition is affected by topography and gradually changes along its topographic position. The occurrences of tree species are correlated with the north-south position. The predicted vegetation distribution pattern roughly followed the topography distribution. The NDVIs of Fushan Experimental Forest is the highest in summer and the lowest in winter, with the highest increasing rate occurs between winter and spring, and the highest decreasing rate occurs in the changes from autumn to winter. Typhoon is a major disturbance source in Fushan. In the year without typhoons, NDVIs may grow till early autumn. If typhoons occurred, however, they interrupted the increase trend of NDVI and reduce the values, and the damage resulted from an individual typhoon was highly dependent on spatial location and heterogeneous. The recovery from typhoon damage may take more than two years based on NDVI's observation. Landscape classification can serve as stratification criteria that can help in ground sampling planning and improve the efficiency and representation of data collection. Estimation of vegetation distribution pattern can be used in wildlife field studies as a habitat layer, or serve as the base of ecological modeling. This study shows that satellite images provide quick and standardized information across large area, and is an efficient tool of long-term monitoring of landscape characteristics. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/75072 |
全文授權: | 未授權 |
顯示於系所單位: | 動物學研究所 |
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