九二一地震後台灣九九峰鳥類組成變化

Bird Assemblages in Relation to Vegetation Recovery at Mt. Jeou-jeou-fen of Taiwan after the 921 Earthquake

1999年九二一大地震於九九峰地區造成大面積的崩塌，並導致山腳形成土石掩埋區與殘存樹林鑲嵌的棲地型態。本研究比較兩類棲地2000-2002年4-7月生殖季的鳥類組成，以決定地震後鳥類組成與植被回復間的關係。在兩個棲地類型內各選擇5個半徑30m的調查點進行鳥類計數與植被測量。在三年的調查期內，樹林組於植被覆蓋度、枝葉高度歧異度及鳥類數量都顯著多於掩埋組，而其差異主要在於樹林蟲食者。掩埋組的植被覆蓋度及鳥類數量雖有逐年增加，但相較於樹林組，其樣點間的變異很大。樹林組與掩埋組的鳥種豐度無顯著差異，推測與個別土石掩埋區面積小且和殘存樹林鑲嵌分布有很大的關係。 Mt. Jeou-jeou-fen of the central Taiwan had an extensive landslide in the 921 Earthquake of 1999, resulting in patchy formation of rubble-piled areas and remained wooded areas on its mountain slope. This study compared bird assemblages between the two areas during the bird breeding months of April to July in 2000 to 2002 to determine the relationship between the bird assemblages and vegetation recovery after the earthquake. At each of the areas, five plots, each with a radius of 30m, were select for bird counts and vegetation measurements. During the three-year study period, percent coverage of vegetation, diversity of foliage height, and the number of bird were significantly higher in the wooded areas than in the rubble-piled areas. The latter was particularly obvious for the forest insectivorous birds. The vegetation coverage and the number of bird in the rubble-pile areas increased with the years but had wider variation among the plots, as to compared to those in the wooded areas. There was no significant difference in the species richness of the birds between the two areas, perhaps due to their patchy distribution.