@article{oai:minpaku.repo.nii.ac.jp:00004505,
 author = {西田, 正規 and Nishida, Masaki},
 issue = {2},
 journal = {国立民族学博物館研究報告, Bulletin of the National Museum of Ethnology},
 month = {Oct},
 note = {Among the several kinds of nuts used for foods during the
Jomon Period chestnuts (Castanea crenata) and walnuts (Juglance
mandshurica)w ere the most important. However, being sun plants
they are rare in primary forests.
Several researchers analyzed charred wood from 12 sites,
ranging in age from the Earliest to the Late Jomon Periods, and
found charred chestnut wood in all sites and charred walnut wood
in 2 sites. In addition, at the Torihama site the Early Jomon
sediment contained seeds of many sun plants, whereas the Earliest
sediment contained few. This seems to suggest a difference in the
residential style between the two periods; temporary gathering
camps in the Earliest Jomon vs. sedentary villages in the Early
Jomon. Inhabitants of the sedentary villages seem to have exploited
nearby primary forests, converting them secondary forest,
which should have provided suitable habitats for chestnuts and
walnuts. This seems to have been the most likely first step toward
intentional food production by man. Speculating thus, it is suggested
here that intentional nut cultivation emerged in the Central
Honshu highland region during the Middle Jomon Period.},
 pages = {234--255},
 title = {縄文時代の人間 植物関係 : 食料生産の出現過程},
 volume = {6},
 year = {1981},
 yomi = {ニシダ, マサキ}
}