Naoki Iiyama's scientific contributions

Publications (3)

Article
Full-text available
Since the 1960s, improving socio-economic conditions in rural Japan have led to the rise in man-made or man-shaped landscapes, which has in turn resulted in formerly abundant species becoming endangered. In order to conserve biodiversity in rural areas, former agricultural landscapes must be conserved. The problem is that ecologically appropriate l...
Article
Full-text available
棚田を保有する地域における「多自然居住地域の創造」を目指した地域計画に資することを目標に, 住民自身による地域資源の認識と, それらの生態学的な評価を試みた. 対象地の大塀和西地区は吉備高原に位置する, 水田作を主体とした一般的な傾斜地農村である.アンケート調査によると, 地域住民は伝統的な農村の地域景観の保全しながら, 地域を自然公園的に活用してゆきたいという意向を持っていた. しかしながら, 農業に付随した形で形成され維持されてきた景観構造は, 農業構造の変化とともに変質しつつあり, 生物多様性も失われつつあった.住民が維持を望む景観要素である棚田や管理アカマツ林は, 稲作を行ってゆくための補助的な管理活動によって維持されてきたものであり, そのような管理体系を持続し得ない現在, 新たな...

Citations

... Rice cultivation is a land-use practice with a long history in this area, but changes in production schemes in the past four decades have had consequences for biotic communities (see, e.g. Lane and Fujioka, 1998; Yamamoto et al., 1998; Arita and Kobayashi, 2000; Fukamachi et al., 2002; Iiyama and Kamada, 2002). Despite the recent recognition of aesthetic and biotic values of rice paddies (see, e.g. ...
... Previous studies have indicated that paddy ridges play an important role as habitats for many grassland plants in the current situation in which the number of grassland plants is decreasing due to the decrease in the extent of grassland environments [1][2][3][4][5][6][7][8]. This has been especially evident in recent years, as the traditional vegetation on paddy ridges has disappeared as a consequence of paddy field infrastructure development. ...
... a) Soil erosion* In order to create magnitudes for this parameter, three categories were established based on the work of Wu et al. (2019) and Dube et al. (2020): (1) rill erosion (less than a 0.3 m depth); (2) erosions (depth between 0.3 m and 1.5 m); (3) gully erosion (depth of more than 1.5 m). b) Contour line (CL) or terracing (T) in rural properties* Rural properties inside the urban area were evaluated for their soil management procedures such as CL or T because this technique is an important prevention against soil/biodiversity loss (Naoki et al., 2005) and drought (Kosmowski, 2018). ...