A study on historical forest changes in Kasumigaura basin

DOI Web Site Web Site 1 Citations 24 References

Bibliographic Information

Other Title
  • 霞ヶ浦流域における森林の歴史的変遷に関する研究
  • カスミガウラ リュウイキ ニ オケル シンリン ノ レキシテキ ヘンセン ニカ

Search this article

Description

Historical forest changes in the Kasumigaura basin, Ibaraki, Japan (about 220km^2), were investigated using the following three methods; a review of existing research papers relating forest changes in the Kasumigaura region, analyses of forest acreage changes in the municipalities in the Kasumigaura basin from 1960 to 1990 using the National Census on Agriculture and Forestry, and a case study on historical forest changes in the "Tsuchiura" area, a part of Kasumigaura basin, using six recent and old 1:50,000 topographical maps from 1905 to 1989. As a result, historical forest changes from the Yayoi Era (circa 300 B.C. to 300 A.D.) to the Showa Era (mid 20th century) were arranged out qualitatively, and existing quantitative case studies on forest changes in two parts of the Kasumigaura basin were identified by the research review. Consequently, analysis of the National Census showed that forest acreage in the Kasumigaura basin has been decreasing almost constantly (560 ha per year) from 1960 to 1990. Finally, topographical map analyses showed that the forest acreage in the "Tsuchiura" area has been decreasing from at least the early 20th century. Overall it was suggested that forest area in the Kasumigaura basin has been decreasing slightly from ancient times, and dramatically since World War Two, especially in 1950s

Journal

Citations (1)*help

See more

References(24)*help

See more

Details 詳細情報について

Report a problem

Back to top