Invasive plants database (IPDB) is assembled containing 26 lists of invasive plants around the world, including 205 families, 1117 genera, 3216 species. 920 species are listed multiplely and 8 specied (0.06%) are available on over 10 lists. In Japan, 43 families 86 genera 109 species are reported escaping or invading into natural or semi-natural environment. 62 species (56.9%) are listed on IPDB, and 94 species (86.2%) on genera and 105 species (96.3%) on families consists. It is valid to use IPDB as preliminary weed risk assessment.

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Recently, the invasion and establishment of naturalized plant species Buddleja davidii has verified and came to a head on the Mibu River water system in the Akaishi Mountains. The distribution and habitat conditions of B. davidii and native close-species Buddleja japonica were studied in order to grasp invasion and established factors, and to consider the influences of the former on the latter in the nine branches of the Mibu River water system. The eighty-two study plots were set up at intervals of five hundreds meters in their branches. As a result, the invasion and establishment of B. davidii were confirmed almost all branches. The appearance percentage of B. davidii was 45.1% in all study plots. The competition relationship between B. davidii and B. japonica, because of that a positive correlation of distribution was accepted in both species. The habitats of both species were established in the widely opened riverbed. The niches of the grain size and pH value of B. davidii had something in common with that of B. japonica. A positive correlation of distribution was accepted between B. davidii and the sabo dam.

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In order to clarify the present state of tree species composition in block parks, the authors have recorded individual number of all the planted and seedling trees in 93 block parks in Tottori City in 2002. To compare with them, the same investigation was also done in 9 shrine woodlands and one landscape park. Consequently, in the block parks, 156 species and 7,455 individuals were recorded as planted trees. Among them, only 37.8% species and 18.2% individuals were native species. In contrast, among 84 species and 3,579 individuals of seedling trees, 57.1% species and 69.9% individuals were native species. In the shrine woodlands, 63.5% species and 76.2% individuals were native species. In the block parks, 77 individuals of seedling trees grew exceed height of 2m and 24.4% of them were Robinia psedoacacia (alien species) and 14.3% were Cinnamomum camphora (domestically alien species) . In the block parks, alien trees were dominant; moreover, well-grown seedling trees were also non-native species. This state is problem for both conservation of local landscape and biodiversity. The authors suggested that native trees are recommended for planting rather than non-native trees in block parks.

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本研究の目的は，ドイツ南西部の中山間地域に位置する調査地区のカルチュラル・ランドスケープと，それを構成する要素をマッピングし，それらの形成過程を再現すること，またその過程において，人間の与えた影響を解析することであった。研究手法である歴史的景観解析は，史料や図面，航空写真などを用いた歴史的解析と，現地調査をベースとして進められた景観解析により構築された。土地区画に直接関連する情報の解析にＧＩＳを用いることにより，異なる時点の情報を相互に結合させ，多次元的な解析を試みた。

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明治時代の代表的軍人･政治家である山縣有朋（1838～1922）は築庭を趣味とした。近代日本庭園の形に強い影響を与えた庭園として無鄰庵が有名だが、この庭は山縣を施主として植治（七代目小川治兵衛）が作庭した。したがって、山縣は近代日本庭園のデザインに強い影響を与えた人物とされる。しかし、植治と無鄰庵庭園についての研究は数多いものの、山縣と庭園とに関する研究は少ない。そこで本研究は山縣有朋の庭園観について、植治と出会う以前に造営した椿山荘庭園を中心に分析考察し明らかにすることを目的とした。結果として、山縣の庭園デザインの根源に、彼の故郷萩の山川の風景－原風景があることが指摘できた。

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