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タイトルヨミ
ショクブツ グンラク モデル ニ オケル シュ セイブン ブンセキ テキヨウ ノ モンダイテン ニツイテ
日本語以外のタイトル
Problems on the adaptability of the principal component analysis in ordination of plant community models
ファイル
言語
日本語
著者
宮田 逸夫
家原 敏郎
[スギ]村 喜則
内容記述(抄録等)
The availability of the principal component analysis was tested using two types of artificial community models: one is based on a simllarity matrix and the other is on a matrix of the number of individuals Models were laid out to make species composition in quadrats change along one or two environmental gradients. In the smilarity model,the gradients were represented by the first two principal components,while those of the individualmodel were done by the second and fourth ones. A great 'foiding-in' effect occurred obviously in the two models when the gradient was excessive or when quadrats with peculiar species composition were added. The smilarity model has a merit to ordinate quadrats properly irrespective of the degree of the environmental gradient and a defect to be strongly influenced by quadrats with peculiar composition. On the other hand,the individual model has a merit to discriminate peculiar quadrats easily and a defect that the rang of the gradient to ordilate quadrats exactly is rather limited. The principal component analysis may be available in extracting the environmental gradient,if the quadrat data are so arranged that a great 'folding-in' effect does not take place.
掲載誌名
島根大学理学部紀要
17
開始ページ
47
終了ページ
60
ISSN
03879925
発行日
1983-12-25
NCID
AN00108106
出版者
島根大学理学部
出版者別表記
The Faculty of Science, Shimane University
資料タイプ
紀要論文
部局
総合理工学部
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