本研究利用掉落式陷阱捕捉地表活動的甲蟲，分析林業試驗所六龜分所所轄之試驗林內甲蟲的棲地及時間的分佈。調查時間自2004年1月至2004年12月，選擇天然林，台灣杉人工林及台灣杉疏伐林為研究樣區。天然林有較高的物種數、個體數及Shannon多樣性指數，而在台灣杉人工林內，物種數及個體數最低。主成分分析及群團分析結果顯示，天然林的物種組成不同於台灣杉人工林及台灣杉疏伐林。進行疏伐後的人工林，其物種組成亦不同於台灣杉人工林。主要影響物種多樣性的環境因子為草本覆蓋度，落葉深度，地表大氣濕度。營養層分析顯示台灣杉疏伐林內的碎屑食者個體數相對台灣杉人工林有顯著增加，樣區內碎屑食者的增加可以增加棲地內養分循環，並促進地被草本，木本植物的生長。甲蟲的數量具有季節性波動，分析樣區內八個優勢科，分別為隱翅蟲科、步行蟲科、象鼻蟲科、金龜子甲科、苔甲科、大蕈甲科、露尾甲科、毛蕈甲科。此八個優勢科季節性的變化，主要發生期開始於三月，四月和五月有一個高峰期。而象鼻蟲科、金龜子甲科、露尾甲科在八月和九月有另一中度高峰期。在兩個人工林樣區內，有相似的季節變化波動。而在天然林樣區內，有些微不同的波動模式。

The spatial distribution and monthly fluctuation of beetle species were studied in the experimental forests of Liu-Kuei Station, Taiwan Forestry Research Institute, Taiwan. Beetles were surveyed using pitfall traps from January to December, 2004. Our result showed that species richness, abundance and Shannon diversity of beetles were significant higher in Natural Forest than those of the others, and species richness and abundance were lowest in Taiwania Plantation. The composition and trophic structure of beetle community in the Thinning Plantation resulting from thinning were compared with that in the Taiwania Plantation and natural forest. Beetles communities of Natural Forest, Taiwania Plantation and Thinning Plantation were separated from each other by ordination (PCA), meaning three forest stands have distinct species assemblages. The three group assemblages were also revealed by cluster analysis. The ground-surface air humidity, litter litter depth and herbs cover were major environment factors influencing the beetle distribution. The relative size of trophic guilds in the Thinning Plantation has changed compared to Taiwania Plantation. Detritivores increased significantly in the Thinning Plantation, suggested an increase of nutrient-cycle in the Plantation. Eight dominant beetle families that were Carabidae, Scarabaeidae, Curculionidae, Staphylinidae, Scydmaenidae, Erotylidae, Nitidulidae and Biphyllidae showed different pattern of population fluctuation. The peak mainly from March to June, and Curculionidae, Scarabaeidae, Nitidulidae also show a moderate peak in August and September. In the two plantation areas, most dominant taxa showed a similarly fluctuation patterns, which are slightly different to those of Natural Forest.

Abstract
Chinese abstract……………………………………………………Ⅰ
English abstract……………………………………………………Ⅱ
Introduction……………………………………………………………1
Materials and Methods………………………………………………4
Results………………………………………………………………10
Discussion……………………………………………………………14
Literature Cited……………………………………………………19
Figures…………………………………………………………………23
Tables…………………………………………………………………32
Appendix………………………………………………………………44

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