Biotope evaluation in yatsu area based on plant communities, butterflies and landscape structure
2007
Yamamoto, S.(National Inst. for Agro-Environmental Sciences, Tsukuba, Ibaraki (Japan)) | Kusumoto, Y. | Shiina, M. | Ide, M. | Okushima, S.
Landscape structure strongly affects bio-diversity in Japanese rural area because of high heterogeneity of biotopes, especially in Yatsu landscape which is the complex of wet paddy fields and dry forests. We analyzed relationship between landscape structure and biotopes of Yatsu landscape in 3 scales. At first, change of Yatsu landscape from 1950s to 1990s using by 50m grid land use data. In second, we survey improvement and management of paddy fields in bottom of Yatsu valley, also survey plant communities and number of butterfly species around paddy at micro scale. At last we evaluate potentiality of Yatsu landscape in Tone River Basin as the biotopes using by Rural Landscape Information System. As the result, it was clarified that potentiality of Yatsu landscape as biotopes was decreased because that improvement and management of paddy fields have been changed for 50 years, and they made change Yatsu landscape and its heterogeneity of biotopes, especially grasslands between paddy fields and forests.
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