@techreport{oai:soar-ir.repo.nii.ac.jp:00016762,
 author = {井上,  直人},
 month = {Mar},
 note = {The plant opal that is silica body originated from gramineae motor cell were detected in the Central-Matsumoto soil layer on Japanese tumulus period， observed by micro spectroscopy， and classified by the morphological characteristics. Dominant species　detected by plant opal analysis was Phragmites communis in each soil layer. Appearance frequency of rice plant opal (Oryza sativa) in lower layer was higher than that in upper one. In the lower layer，t he shape of rice plant opal was similar to that of subsp. lndica in modern ages. It was suggested from these relics that the lndica rice were introduced from southern part and cultivated on damp ground along Metoba River on Japanese tumulus period. The pollen of Pinus densiflora and the plant opals of genus Echinochloa were detected in same layers observed many rice plant opals. It was estimated that the vegetation in the ages was relatively more disturbed by human activity., Article, 環境科学年報24:61-70(2002)},
 title = {古墳時代における松本の人里環境に関する民族植物学的研究},
 year = {2002}
}