富山県に自然分布するモチノキ科植物の分布の特徴

The characteristics of the distribution of ten taxa in Aquifoliaceae in Toyama Prefecture were examined with eighty seven environmental factors obtained from Mesh Climatic Normal Values (Japan Meteorological Agency, 2016). The taxa treated here are six taxa of Subgenus Ilex and four taxa of Subgenus Prinos. The environmental factors are monthly and annual value of precipitation, mean temperature, maximum mean temperature, minimum mean temperature, day length and amount of solar radiation, monthly maximum snow deposit and annual maximum snow deposit, WI, CI, Nihonkai index proposed by Suzuki and Suzuki (1971), and altitude. The data of range of ten taxa were provided from the specimen description in TOYA, literature and field note of authors. The analysis of the distributions used one-way ANOVA and cluster analysis. The climatic environments of each ten taxa in Subgenus Ilex were significantly characterized by annual mean temperature, as Ilex integra was found in warmest area, I. rugosa was found in coldest area, and other taxa were distributed in the intermedia area between I. integra and I. rugosa. Except I. integra, there was no significant difference in annual precipitation among taxa of Subgen. Ilex. Comparing the deepest snow deposit, Subgen. Ilex was classified into four groups, such as I. integra group, I. pedunculosa group, I. leucoclada group and I. rugosa group. By the climatic environments Subgenus Prinos was failed to characterize the each taxon. Although there were no significant differences in annual precipitation, deepest snow deposit, annual duration of sunshine and Japan Sea Index among these taxa, I. nipponica and I. serrata were found in warmer area and I. macropoda and I. geniculata var. glabra were found in cooler area. By a cluster analysis ten taxa was clustered into four groups, I. integra group only for I. integra characterized by warmest temperature, longest annual of sunshine, little deepest snow deposit and fewer summer precipitation than winter, I. pedunculosa group including I. crenata, I. nipponica, I. serrata, I. macropoda and I. geniculata var. glabra which characterized by cooler temperature than I. integra, less than 1m deepest snow deposit and fewer summer precipitation than winter, I. leucoclada group including I. sugerokii var. brevipedunculata which characterized by intermediate temperature condition, shortest annual of sunshine, more than 1m deepest snow deposite and summer precipitation as same or more than winter, I. rugosa group only for I. rugosa characterized by coldest temperature, most deepest snow deposit and more summer precipitation than winter.

富山県に自然に分布するモチノキ科植物10分類群の分布環境を，富山市科学博物館所蔵の標本情報とメッシュ平年値2010を用いて多変量解析を行った．その結果，モチノキ，ソヨゴグループ，ヒメモチグループ，ツルツゲの4つのグループに分けられた．モチノキ単独グループは年平均気温が最も高く夏の降水量が冬より少ない地域に，ソヨゴグループは年平均気温がモチノキよりも低く夏の降水量が冬より少ない地域に，ヒメモチグループは年平均気温がツルツゲに次いで低く夏の降水量が冬と同じかまたは冬より少ない地域に，ツルツゲ単独グループは年平均気温が最も低く夏の降水量が冬より多い地域に，それぞれ分布していることがわかった．