Seasonal Variations in the Community Structure of Aquatic Organisms in a Paddy Field under a Long-Term Fertilizer Trial
スポンサーリンク
概要
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To estimate the effect of fertilizers on aquatic organisms ranging in size from 30 μm to 2cm in a Japanese paddy field under a long-term fertilizer trial (the plots without fertilizers, with chemical fertilizers only, and with chemical fertilizers as well as two levels (7.5 and 22.5 tons ha^<-1>) of rice straw compost), we collected the floodwater samples once every 10d during the cropping season throughout 3y and mainly classified aquatic organisms in the floodwater at the order level. The frequency of the presence of Chlorococcales, Lemanaceae, Euglenida, Oligotrichida, Pharyngophorida, Sessilida, Turbellaria, Podocopida, and Cyclopoida was significantly different among the plots, while the maximum population density was significantly different for Cladocera and Cyclopoida among the plots. The effects of the sampling year on the frequency of presence and the maximum population density were also observed. The floodwater samples after midseason drainage in three plots with fertilizer application differed from the samples in the plot without fertilizer application in the community structure of aquatic organisms. Principal component analysis showed that Lemanaceae, Pharyngophorida, and Turbellaria were important components in the floodwater samples after midseason drainage in the three plots with fertilizer application. Although Cladocera appeared more abundantly after midseason drainage in the plot without fertilizers and the plot with chemical fertilizers only, it appeared more abundantly before midseason drainage in the two plots with composts. Shannon-Weaver's index of diversity (H') was higher in the three plots with fertilizers than in the plot without fertilizers. The effect of fertilizer application on the community structure and the diversity of aquatic organisms was more conspicuous than that of the sampling year.
- 社団法人日本土壌肥料学会の論文
著者
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Yamazaki Masatsugu
Graduate School Of Bioagricultural Sciences Nagoya University
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Yamazaki Masatsugu
Graduate School Of Agricultural Sciences Nagoya University
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Hamada Yukihiro
Laboratory Of Crop Science Aichi-ken Anjo Research And Extension Center
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Ibuka Takeo
Laboratory Of Crop Science Aichi-ken Anjo Research And Extension Center
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Momii Takashi
Laboratory of Crop Science, Aichi-ken Anjo Research and Extension Center
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Kimura Makoto
Graduate School Of Bioagricultural Sciences Nagoya University
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Momii T
Laboratory Of Crop Science Aichi-ken Anjo Research And Extension Center
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Kimura Makoto
Graduate School Of Agricultural Sciences Nagoya University
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Momii Takashi
Laboratory of Crop Science, Aichi Prefecture Anjo Research and Extension Center
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