本稿は,奄美大島における在来ネギ属野菜の伝統的な識別と呼称,ならびにそれらの変容の実態を明らかにし,主として九州本土からの文化の流入とその影響について検討した.在来ネギ属野菜は,‘ビラ’(ニラ),‘ガッキョ’(ラッキョウ),‘フィル’(ニンニク),‘ヌィビル’(ノビル),‘キビラ’(ネギとワケギを一括)などの代表的呼称により,古くから識別されていた.江戸時代末期から明治時代にかけて,‘フィル’を‘ニンニク’と称し,‘キビラ’を‘ヌィフカ’(ネギ)と‘センモト’(ワケギ)とに呼び分ける様式が九州本土から伝播して北部に定着し,徐々に島内に浸透した.やや遅れて,本土系葉ネギが導入され,冬作ネギとして普及するにつれて,その呼称‘ヌィフカ’はいち早く島内全域に定着した.この結果,ネギとワケギについて,北部では本土型の識別を行なって両者を区別するが,南部では区別しない.呼称‘ヌィフカ’は島内全域に普及しているが,北部ではネギを指し,南部では主に本土系葉ネギを指す。‘センモト’は北部を中心に使われ,ワケギを指すが,‘キビラ’は南部を中心に使われ,在来系葉ネギとワケギを指す.

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本稿では,私鉄資本による代表的な大規模住宅地開発である東急多摩田園都市をとりあげ,その形成過程や特徴に,開発主体である東急の動向がいかに具現化しているかをみた.その結果は以下の点に要約できる. (1) 東急主導の土地区画整理手法.この手法により東急は,少量で分散した土地買収状態でも,新線沿線の広域的開発を主導できた.しかも事業を代行することにより,新たに保留地を安価で大量に取得することが可能となった. (2) 人口定着策としての高密度開発.私鉄資本ゆえに新線の収益性を無視することはできない.そこで,東急は高密度開発を進めたが,一方で社会資本の不足を激化させることになった. (3) 遠隔地からの住宅地形成.東急は新線沿線各所に土地を所有していたため,地価上昇を見込んで遠隔地から分譲するという傾向がみられた. (4) アンバランスな土地利用の混在.東急は高級な一戸建住宅や分譲マンションを,地元地主は独身寮や賃貸マンションを建設したため,土地利用は無計画なものとなった.

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The purpose of this paper is to describe the grain size distribution of littoral suspended sand. The samples were collected at the offshore area of the Tatado Coast near Shimoda, Izu Peninsula, Central Japan, where bottom material is stirred up to some extent by wave action. The collection work was conducted by using a vacuum system fixed to the sea bottom for drawing up the sea water from the nozzles arranged at various heights (Table 1).
The results of the grain size analyses of the samples are plotted on Fig. 1, in which the ordinate represents the probability density function. Each sample consists of two populations, i.e. sand particle population (coarser than about 3.5_??_) and finer particle population (finer than about 3.5_??_); this is similar to those of wind blown sand and river suspended sand which have been described in the previous paper (Inokuchi, 1980).
In Fig. 1, it seems that the points of the sand particle population for each sample deviate systematically from the broken line which represents theoretical log-normal curve for that population. This tendency of deviation corresponds to that indicated by Bagnold and Barndorff-Nielsen (1980) and suggests that the distribution pattern of the points conforms to the hyperbolic distribution. A pair of solid straight lines is the hyperbolic asymptotes for each sample.
Table 2 shows the values of the slopes of the asymptotes, in which S means value of the finer wing slope and C the coaser wing slope. It is found that for all samples the values of the slopes are confined into a limited range and that for each sample S and C are approximately equivalent. This fact may imply a regularity in suspension of sand particles affected by fluid actions.
Grain size distribution of the four samples from beach sand was also examined. As shown in Fig. 2, each of them consists of sand particle population and their grain size distributions show hyperbolic type. However, the pattern of the size distribution is different from that of suspended sediments as shown in Fig. 1.

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This symposium was the first attempt in the Association of Japanese Geographers to discuss the problems on large-scale land transformation and related environmental changes, which became not to be disregarded even in geomorphology. In 1980, the Working Group on the Man-Made Landforms and Land Transformation was organized in the Association for the promotion of systematic and comprehensive studies on such problems, which led us to organize this symposium. The following 10 papers were presented under 6 topics.
T. TAMURA, H. YAMAMOTO and S. YOSHIOKA: National summary of recent studies on large-scale land transformation.
A. MORIYAMA: Genetic approach to man-made landforms resulting from porcelain clay mining in the Seto Area.
S. TANAKA and T. OKIMURA: Land transformation due to urbanization in the Rokko Mountains, Kobe, Kinki Metropolitan Area.
T. YAMAKAWA: Land transformation attendant on urbanization in Western Kanagawa Prefecture.
S. HIGASHI: Role of forest management in the exploitation of mountainous environment.
T. TATEISHI: Coastal sand dunes historically inherited from planting for erosion control, a case of Shonai Sand Dunes.
M. KUSAKA: Implications of ancient land transformation in the olden provinces of Settsu, Kawachi and Izumi.
Y. AKAGI: Landforms resulting from iron sand mining in the Chugoku Mountains.
K. KATSURAGI: Changes of social environment affected by dehydration of paddy fields and construction of a new port in the Imizu Plain, Toyama Prefecture.
S. MEZAKI and K. KANEMURA: Land transformation and effects on sedimentation and coastal environment on Okinawa Island.
The discussions by commentators and audience were focused on the following subjects.
1. Accumulation and management of quantitative data. 2. Role of geographical approach to land transformation. 3. Classification and evaluation of man-made landforms. 4. Measures against accelerated or catastrophic phenomena.

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