本研究以圓圈法(circular plot method)調查台南市19座公園裡鳥類的種數與隻數，並且將之量化為各鳥種的平均密度、生物多樣性指標、各功群的平均密度等。並將此三種鳥類群聚特徵與都市的環境變數進行統計分析，希望能夠藉此 (1) 瞭解都市土地使用對於鳥類生態的影響、(2) 瞭解不同習性或功群(guild)的鳥種對於都市環境變化的反應、(3) 建立都市鳥類生態之模型、(4) 提出都市規劃設計的建議。
　　本文所採用的環境變數，經由文獻回顧選定了公園內部環境(包括公園空間結構、棲地特徵、人為干擾)及都市環境(包括土地使用強度、綠地面積)兩大類環境因子。此外，由於不同鳥種對於都市環境的感知範圍不同，故本研究以多尺度的方法計算都市建築物面積、綠地面積。然而，由於研究的尺度過小，導致各尺度之間呈現高度共線性，故無法判斷不同鳥種對於哪一個尺度的都市變數反應最敏感。
　　都市綠地面積的取得是利用衛星影像，取紅光與近紅外光波段的資訊，並轉換為NDVI值(Normalized Difference Vegetation Index, 詳見內文p.22)。由於土壤的NDVI值介於-0.1~0.2，且植栽的NDVI大於非植栽地物，故以0.2作為臨界值，計算研究尺度中，NDVI大於0.2的像素有幾個，並以此值作為都市綠地面積的指標。
　　研究結果顯示：(1)單一因子中，公園面積最能解釋鳥種的豐富度(76.2%)。(2)公園外部的建築物面積對於公園內的鳥類群聚特徵影響相當大，且不同鳥種、功群對於此變數的反應不同：高度耐受種類，如麻雀、野鴿，會隨著建築物變多而增加；而非耐受種，如紅尾伯勞，則會減少。整體而言，當建築物面積變多，鳥類個體平均密度會增加，然而豐富度、歧異度、均勻度都會降低。(3)公園外部的綠地面積增加，會導致少數鳥種大量增加，故導致均勻度、歧異度降低。(4)公園內的植栽歧異度對各種功群特徵的影響不明顯。

　　We determine, through circular plot method survey in 19 urban parks in Tainan City, how birds of different species and guilds respond to urban environment. Biodiversity indices (richness, relative abundance, evenness, Shannon-Weiner diversity index, Margalef’s richness index) were also used to characterize the avian community. There are two main categories of environmental factors used in this study: interior environment (including landscape structure, habitat characteristics, and human interference) and the peripheral environment (including urban land use intensity, and vegetation coverage) of the park.
　　Birds of different species may respond to different scales of environmental factors. Therefore, multiple scales of urban land use intensity and vegetation coverage were calculated. However, owing to the relatively small scales investigated in this study, highly colinearity made it hard to distinguish which of the scales do birds respond to most significantly.
　　Satellite image data was used to discriminate the vegetated area surrounding the park. Information of the RED and NIR (near infra-red) spectral bands was drawn out from the remote sensing data to derive the NDVI value (Normalized Difference Vegetation Index, p.22). The number of pixels with NDVI value higher than 0.2 is used as the index of vegetated area surrounding the park.
　　The conclusions of this study is that: (1) among single factors, the park area can best explain the variations between species richness; (2) the building area surrounding the park affects the avian communities significantly, and different bird species or guilds respond differently; (3) when the vegetated area surrounding the park increases, few bird species increases substantially, thus causing the evenness and diversity to decrease; (4) the effect of the vegetation diversity in the park on avian community is not significant.

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