論文 - 鈴木 貢次郎
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Growth of Castanopsis sieboldii and Cinnamomum camphora saplings under different soil physical properties with mixing soil amendments. 査読あり 国際共著
Kako Matsunaga, Haruka Ishikawa, Ryosuke Atsukawa, Yumiko Kanazawa, Satoru Tanaka, Kojiro Suzuki, and Ian D. Rotherham
Arboriculture & Urban Forestry 51 ( 2 ) 10 - 127 2025年03月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：International Society of Arboriculture
Background: Urban areas, many located in lowlands, are often characterised by poor drainage and compacted soil and this can have
an impact on the growth of urban trees. Castanopsis sieboldii and Cinnamomum camphora are 2 evergreen tree species distributed throughout
southern Japan. Many of these trees are planted in urban areas and their suburbs, and others grow naturally. The differences between these 2
species in their response to soil physical conditions, particularly those towards waterlogging and low aeration conditions, have not previously
been studied. Methods: In this study, we analysed and compared the tolerance of Castanopsis spp. and Cinnamomum spp. to stagnant soil water
conditions and investigated the effects of soil quality improvement using obsidian perlite to increase air content in soil under stagnant and
drained water conditions on the growth of these plants in pot experiments. In the study, Castanopsis and Cinnamomum plants were grown on
sand alone or mixed with obsidian perlite, and these were subjected to stagnant or drained water treatments. Results: Under stagnant water conditions,
all young Castanopsis trees died within approximately 18 months. In contrast, only one young tree of Cinnamomum spp. grown on sand
died under stagnant water conditions, and those grown on sand mixed with obsidian perlite were still alive after 35 months under stagnant conditions.
Soil quality improvement using perlite increased the leaf abundance (numbers) in both species. Conclusions: Stagnant water with a
reduced soil air phase adversely affected Castanopsis spp. growth, but over the study period of 3 years Cinnamomum spp. was unaffected.
When selecting tree species for urban planting, the impact of localised soil conditions on tree physiology may be critical. -
土壌改良剤の有無による土壌物理性の違いが スダジイとクスノキ稚樹の成長に及ぼす影響 査読あり
松永佳子・金澤弓子・田中 聡・鈴木貢次郎
樹木医学研究 28 173 - 180 2024年08月
担当区分：最終著者 記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：樹木医学会
野外におけるポット実験により土壌改良剤を用いて異なる土壌物理性を設定し，スダジイとクスノキの成長量を比較した．大型プラスチックポットを用いて，山砂のみの対照区（C）と山砂に黒曜石パーライトを40%（体積比）混和した土壌改良区（EP）を設定し，2017年4月から41ヵ月間，生育量を測定した．その結果，両樹種ともにEPでは生育期間中Cよりも根元直径が大きい傾向があり，その傾向はクスノキよりもスダジイで著しかった．EPとCで樹高に明確な差はみられなかったが，一次枝長はスダジイEPでCより大きい傾向があり，一方でクスノキではEPとCの差はみられなかった．同様に葉数はスダジイEPでCよりも有意に多く，クスノキでは差がなかった．最終的な総乾物重量は，スダジイではCよりEPで大きい傾向があり，クスノキではEPとCの違いはなかった．スダジイでは対照区の成長が劣り，土壌改良区の葉数が有意に高まったが，クスノキでは処理による違いはなかった．土壌改良剤の効果は樹種によって異なり，植栽時の土壌物理性がその後の樹木の成長量に影響することが明らかになった．
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Distribution of giant trees in the urban areas and western suburbs of Tokyo, Japan 査読あり 国際共著 国際誌
Kako Matsunagaa Department of Landscape Architecture, Graduate School of Agro-Environmental Science, Tokyo University of Agriculture, Setagaya-Ku, Tokyo, Japan View further author information ,Ryosuke Atsukawa,Peng Xu,Nanako Killmann,Norma G. Medina,Satoru Tanaka,Kojiro Suzuki, Ian D. Rotherham
Arboricultural Journal 45 ( 4 ) 290 - 318 2023年08月
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Taylor & Francis Online
Giant trees reflect site environmental conditions and to elucidate the distribution pattern of the giant trees, we investigated relationships between giant tree locations and landforms. On the basis of elevation, the landforms of Tokyo were divided into four types (lowland, plateau, hill, and mountain), and tree distribution patterns were divided into five groups, including three sub-types, with occurrence patterns of representative species [I: Frequently lowlands, often plateaux and mountain type (Machilus thunbergi); II: Frequently plateaux, often lowland, hill, or mountain type (Quercus acuta, Prunus speciosa, Taxodium distichum, Liriodendron tulipifera, Cedrus deodara, Aphananthe aspera, and Prunus × yedoensis “Somei-yoshino”) with two subtypes, II-1: Typically plateaux (Cinnamomum camphora, Castanopsis sieboldii, and Ginkgo biloba) and II-2: Frequently plateaux and hills (Zelkova serrata); III: Typically plateaux and hill type (Certis sinensis var. japonica, Torreya nucifera, Carpinus tschonoskii, Quercus myrsinifolia, and Quercus serrata) with one subtype, Frequently plateaux (Prunus jamasakura); IV: Mountains often with plateaux or hill type (Acer pictum subsp. mono, Aesculus turbinate, Abies firma, Cryptomeria japonica, and Cercidiphyllum japonicum); and V: Mountain-limited type (Castanea crenata, Pterocarya rhoifolia, and Fraxinus platypoda)]. Some giant trees, including Quercus crispula, Fagus japonica, Fagus crenata, and Tsuga sieboldii, were distributed in mountainous areas but not on plateaux, hills, or in lowlands. Some unique giant trees (Aphananthe aspera, Certis sinensis var. japonica, and Carpinus tschonoskii) are self-seeding in the wild and found in plateau areas but not mountainous or hilly areas. These results suggest that the distribution of giant trees is influenced by site ecological characteristics, tree physiology, and human management and land-use.
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川崎市早野梅ヶ谷特別緑地保全地区における土壌表面硬度とアオオサムシの個体数の関係 査読あり
立石 源基, 鈴木 貢次郎, 田中 聡
ランドスケープ研究 86 ( 5 ) 627 - 632 2023年03月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：公益社団法人 日本造園学会
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Response of Native Plant, Ardisia pyramidalis (Cav.) Pers. to Alkaline Soil Condition for Use in Urban Landscape in Manila City, Metro Manila, Philippines 査読あり 国際共著
Norma G. MEDINA, Nanako KILLMANN, Satoru TANAKA and Kojiro SUZUKI
Journal of agriculture science, Tokyo University of Agriculture 2023年01月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（大学，研究機関等紀要）
Ardisia pyramidalis (Cav.) Pers. is an evergreen tree and native species found in the Philippines with conspicuous flowers, edible leaves and medicinal values. Though rarely seen and commonly grown in nurseries, it is one of the native species that has potential for use in the urban environment. One of the challenges of enriching biodiversity in the urban area is the establishment of native plant species able to cope with harsh soil condition like increasing soil pH that has strong impact on plant growth. Field survey showed that soil in urban area has pH more than 7.0 or sometimes over 8.0 while soil where Ardisia naturally grows showed acidic ranging from 4.1-6.2. Planted Ardisia was growing well at soil pH 6.0-7.5. Thus, experiments to evaluate the tolerance reaction of A. pyramidalis to alkaline soil were conducted in Laguna Philippines from October 2020 to December 2021. Seedlings were grown in pots with 8-kg soil with varying amount of lime (Ca (OH)2). The results showed survival of plants at soil pH 7.5-7.7. At soil pH ≥8.3, the plants quickly defoliated but produce new leaves four to five months after treatments. Alkaline soil has significant effect on the number of leaves, tree height and leaf size of A. pyramidalis. But even beyond the optimum soil pH range for most plants, growth performance of Ardisia indicated that it is sensitive to changes in pH and has a wide range of pH adaptability. Deeper understanding of soil characteristics is crucial to sustain good health condition of the tree in urban landscape.
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アズマネザサの刈り取りがムラサキシキブ属2種の種子発芽および初期成長に及ぼす影響 査読あり
中島 宏昭, 森山 蒼大, 田中 聡, 鈴木 貢次郎
日本緑化工学会誌 48 ( 1 ) 56 - 61 2022年08月
記述言語：日本語 出版者・発行元：日本緑化工学会
<p>ムラサキシキブおよびヤブムラサキは，関東地方における二次林（落葉広葉樹）の低木層を構成する。しかし，管理放棄によるアズマネザサの生育は低木層や草本層を著しく衰退させる。そこで，夏期に一度のアズマネザサの刈り取りが両種の種子発芽と実生の初期成長に与える影響について調査した。実験室および二次林内での種子発芽実験の結果，採取直後は明条件で発芽率が高く，6か月間低温湿潤貯蔵することで暗条件でも発芽率が向上することが判明した。また，実生個体の栽培実験でアズマネザサ下の生存率は0～16.7％であったのに対し，アズマネザサを刈り取ることで，生存率が60％以上に向上し，実生の成長に大きく影響することが明らかとなった。</p>
DOI： 10.7211/jjsrt.48.56
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Relationship between the greenspace area and number of plant species in the urban area of Yokohama, Japan 査読あり
Nanako Killmann, Norma G. Medina, Kako Matsunaga, Kojiro Suzuki, and Satoru Tanaka
ECO-HABITAT:JISE Research 28 ( 1 ) 2022年06月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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異なる温度下における滞水条件がスダジイとツブラジイの稚樹の生育に及ぼす影響
松永 佳子, 鈴木 貢次郎
樹木医学研究 26 ( 2 ) 81 - 82 2022年04月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等） 出版者・発行元：樹木医学会
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Characteristics of urban greenspaces based on analysis of woody plants in Yokohama City, Japan 査読あり 国際共著 国際誌
Nanako Killmann, Fumitaka Nishino, Kojiro Suzuki, Ian D. Rotherham
Landscape and Ecological Engineering 18 ( 2 ) 221 - 238 2022年04月
記述言語：英語 掲載種別：研究論文（学術雑誌）
Urban greenspaces are public spaces, fulfilling multiple city functions, such as improvement of public health. They are also ecosystems which provide biodiversity as part of the green infrastructure. To evaluate greenspaces as ecosystems, seventeen urban greenspaces in Yokohama, Japan, were selected to conduct surveys of flora and construct a vegetation table. The pre-sent study investigated the number of woody plant species; their growth form (tree, shrub, or liana); the ratio of evergreen to deciduous plants; and whether plant species were native, exotic, wild, or planted. The greenspaces were compared with the control area, Enkaizan, a suburban greenspace within Yokohama and representative of Satoyama (a traditional landscape model with sustainable living space). The comparison used cluster analysis to match the correlation of identified species in each greenspace and split them into four groups: (1) natural, (2) quasi-natural, (3) quasi-artificial, and (4) artificial. The study found the natural greenspace group to have an intact hierarchical forest structure with trees, shrubs, and lianas; whereas artificial greenspaces missed either tree or shrub layers and had few lianas. The more artificial greenspaces had higher pro-portions of exotic and evergreen species.
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タマノカンアオイの生育・開花に及ぼすアズマネザサの刈り取りの影響 査読あり
中島 宏昭, 久野 直人, 増田 楓, 平野 友佳鈴, 亀山 慶晃, 鈴木 貢次郎
ランドスケープ研究 84 ( 5 ) 687 - 692 2021年03月
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Landforms and distribution patterns of giant Castanopsis sieboldii trees in urban areas and western suburbs of Tokyo, Japan 査読あり 国際共著
Tomotsugu Watanabe, Kako Matsunaga, Yumiko Kanazawa, Kojiro Suzuki, Ian D. Rotherham
Urban Forestry & Urban Greening 60 ( 126997 ) 2021年01月
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
Combining both biological diversity and cultural significance, populations of big trees in Japan are considered important. Furthermore, individual specimens, often with broken and unusual tree form, are highly striking and create a ‘sense of place’ in a locale. The giant Castanopsis sieboldii trees belonging to the family Fagaceae have a trunk circumference of over 3 m. These trees are distributed on various landforms in Tokyo and its western suburbs. In this study, we conducted field surveys to determine the distribution pattern and geographical con-ditions of giant C. sieboldii trees growing in urban areas and western suburbs of Tokyo. The topography of Tokyo is variable, comprising mountainous areas, hills, plateaux, lowlands, and reclaimed lands with large rivers or streams. The places where giant C. sieboldii trees grew were classified into 13 categories using cluster analysis of geomorphic landscape sections. The lowest point of the area within a 2-km radius surrounding the giant trees was determined through field surveys and based on geomorphic sections in four directions. Trees growing on slopes, plateaux, and hilltops or mountain tops, or along the edges of plateaux represented 80 % of the total recorded trees. Two categories were an exception to this, where the height difference between the lowest and highest altitude was less than 10 m. Giant trees were mostly distributed above the 10-m contour line, on plateaux or hills and especially on slopes along the edges of 10, 30, 120, 170, and 210-m contour lines on flat uplands. Altitude appeared to be a significant factor for giant tree distribution, with only a few giant trees located below the 10-m contour line in low lying or reclaimed lands. Finally, we discuss the reasons underlying this unique distribution of C. sieboldii in the light of the physical characteristics of different landforms.
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栃木県小山市における思川桜の植付け後17年生の樹形変化 査読あり
金澤 弓子, 鈴木 貢次郎
関東森林研究 72（1） 49 - 52 2021年
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関東地方の放棄二次林における林床と竹林の管理が地表性甲虫類の生息数に及ぼす影響
大浦 一将, 藤井 響市, 中島 宏昭, 鈴木 貢次郎
ランドスケープ研究 83 ( 5 ) 743 - 748 2020年05月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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ウラジロガシとシラカシの生育土壌条件（物理性）
藤村大，厚川亮介，鈴木貢次郎
樹木医学研究 24 ( 2 ) 94 - 95 2020年04月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等） 出版者・発行元：樹木医学会
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スダジイ(Castanopsis sieboldii)の生育に及ぼす土壌の物理性と化学性
松永佳子，丸橋佳織里，鈴木貢次郎
樹木医学研究 24 ( 2 ) 128 - 129 2020年04月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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クスノキ(Cinnamomum camphora)の生育に及ぼす肥料4要素の影響
厚川亮介，丸橋佳織里，金澤弓子，鈴木貢次郎
樹木医学研究 24 ( 2 ) 118 - 119 2020年04月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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関東地方の放棄二次林における林床と竹林の管理が地表性甲虫類の生息数に及ぼす影響 査読あり
大浦 一将, 藤井 響市, 中島 宏昭, 鈴木 貢次郎
ランドスケープ研究 83 ( 5 ) 743 - 748 2020年03月
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Seed germination characteristics of Maianthemum dilatatum (Wood) Nels. et Macbr. (Asparagaceae) 査読あり 国際誌
Hitomi Kawano, Yumiko Kanazawa, Kojiro Suzuki, Masashi Ohara
Plant Species Biology 35 ( 1 ) 1 - 11 2019年09月
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
The seed germination characteristics of Maianthemum dilatatum were investigated in a laboratory experiment and the results compared with those of other species in the subfamily Asparagoideae, LILIACEAE (Engler's system).M. dilatatum seeds mature in late September to October in montane to subalpine areas across Japan. Germination percentages and rates were low for fresh seeds at 10 to 30C. Seeds cold stratified for 4 months or longer showed increased germination percentages and rates. The seeds lost germinability with decreasing moisture content. The seeds germinated well in dark conditions. The process of germination from the cotyledonary sheath/petiole breaking through the seed coat to the appearance of the first and second leaves was examined. After emergence of the cotyledonary sheath/petiole, a root emerged from it, and additional roots appeared after 1–2 months. The plumule emerged from the cotyledonary sheath/ petiole after the seedling had three roots. Seeds dispersed in autumn, and germinate slowly in the next spring after exposure to low temperature even though dark condition as buried seed. We compared the seed germination characteristics among species in the Asparagoideae or with other recent taxonomy, and found that seedlings of Paris erticillate and Trillium apetalon, which belong to Melanthiaceae, and Streptopus streptopoides Var. japonica and Clintonia udensis, which belong to Liliaceae (linear cotyledon), were different from Asparagaceae, showing a globose cotyledon in the APG II.
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スダジイの生育と土壌の化学性の関係
丸橋佳緒里, 中溝みず紀, 井上わらび, 鈴木貢次郎
樹木医学研究 23 ( 2 ) 102 - 103 2019年04月
担当区分：責任著者 記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：樹木医学会
プナ科シイ属に属するスダジイ (Castanopsis sieboldii)は，暖温帯に分布する常緑広葉樹の代表種である． 埋立地低地，丘陵地，山地など，比較的多様な地形を呈する東京の都心部及びその西部にある日本庭園や公園寺社等には，スダジイの巨木が多くみられる但し， 時に人為的な影響により，その生育が劣る場合もあり， 樹幹の崩れや傾き，幹や枝の欠損，菌類の発生などがみられることも多い． 生育が劣る要因には，生育地の土壌条件も大きく影響すると考えられるが，これまでスダジイの 生育に及ぽす土壌条件に関しては，ほとんど調査されていない．そこで本研究では，現地調査によりスダジイの 巨木の生育状態と根元周囲の土壌の化学性について調 ベ，これらの関係を見た.
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Species, size, and location of `giant trees' in Tokyo's urban area and western suburbs 査読あり 国際共著 国際誌
Xu Peng, Kotaro Tachikawa, Hiroaki Nakajima, Yumiko Kanazawa, Kojiro Suzuki, Christine Handley, and Ian D. Rotherham
Journal Arboricultural Journal 40 ( 4 ) 232 - 254 2018年10月
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Taylor & Francis
The Japanese landscape has been characterised by the occurrence of ancient, massive trees described here as “giant trees”, and many of these have had major historic, cultural, and religious significance. However, modern Japan has experienced significant and rapid urbanisation and in relation to ancient woods and trees, “cultural severance” too. This study identified the species, size, and locations of the giant trees growing in Tokyo’s urban centre and its western suburbs, by conducting field surveys and collecting data from published studies. Classification of sites according to tree girth, with giant trees, revealed six broad locations: (1) forest and agricultural lands of managed secondary and later abandoned woodland with deciduous, broad-leaved trees; (2) public gardens, comprising useful and ornamental plants introduced from southern Japan; (3) parks, including mostly exotic species; (4) shrine sites, including Zelkova serrata, conifers, and evergreen broad-leaved trees; (5) temple sites, including many Torreya nucifera; and (6) Imperial lands, with rare species of trees in low numbers. The highest percentage of giant trees (36%) were found in parks, followed by temple and shrine sites (32%), whereas only 10% were found in other historical places. This study highlights the importance of studying giant tree habitats and history and identifying the relationships between human activities and living trees.