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題 名 | 集水區火燒嚴重度與植生恢復率關係之研究=Relationship of Burn Severity and Vegetation Recovery Rate in a Watershed |
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作 者 | 詹杭勳; 蘇潘; 林昭遠; | 書刊名 | 水土保持學報 |
卷 期 | 48:2 2016.06[民105.06] |
頁 次 | 頁1697-1707 |
分類號 | 436.124 |
關鍵詞 | 環境指標; 火燒嚴重度; 植生恢復率; 塔塔加火燒; Environmental index; Burn severity; Vegetation recovery rate; Tataka fire; |
語 文 | 中文(Chinese) |
中文摘要 | 野火常造成水土資源與景觀破壞,對環境復育有長期影響,故瞭解集水區火燒嚴重度與植生恢復率之關係為重要課題。本研究以1993年玉山塔塔加野火事件為例,藉由LANDSAT衛星影像萃取環境指標,分析集水區野火前地覆類別、火燒嚴重度、以及火燒跡地植生恢復率(VRR),並透過統計檢定方法探討火燒影響與植生恢復能力之關係。結果顯示:火燒跡地於野火前之地覆可分為林地、疏林地及草地等三類;火燒嚴重度主要以低、中級為主,樣區之VRR與嚴重度呈顯著負相關。六年後各火燒嚴重度等級下各地覆類別之VRR分別是:低嚴重度以林地105.80%最高,疏林地94.93%次之,草地之89.34%最低;中嚴重度等級各地覆類別差異不大,其VRR介於86%至82%;高嚴重度等級之VRR皆小於80%,以野火前之草地其VRR為71.74%最差,可知火燒跡地之火燒嚴重度明顯影響後續植生之復育,火燒嚴重度指標可作為VRR之參考。 |
英文摘要 | Wildfire generally causes the increase of runoff and erosion, landscape breakage and other multiple effects, and it requires a long time to recover naturally. Therefore, identifying the relationships between burn severity and post-fire vegetation recovery rates is an important issue. In this research, the Tataka fire occurred at the Yushan National Park in 1993 was selected as the study case. Normalized Burn Ratio (NBR) and Normalized Difference Vegetation Index (NDVI) from LANDSAT satellite imageries were used to analyze the pre-fire land-cover, burn severity and Vegetation Recovery Rate (VRR) in the wildfire area. Furthermore, relationships of burn severity to VRR were examined statistically. Results show that the main land-cover types of the pre-fire sites are forest, sparse forest and grassland. The levels of burn severity are mainly low to medium. The VRR of the sampled sites is negatively correlated with burn severity. Forest with low burn severity has the highest VRR (105.80%), followed by sparse forest (94.93%), and grassland (89.34%). For the medium burn severity, the VRRs for each land-cover type ranges from 82% to 86% and the differences of VRRs between land-cover types are not significant. The VRRs for the three land-cover types with the high burn severity are all less than 80%, and among them the grassland has the lowest VRR of 71.74%. Results show that burn severity does significantly affect vegetation recovery, and the burn severity index can be used as a reference for VRR assessment. |
本系統中英文摘要資訊取自各篇刊載內容。