国土交通省 国土技術政策総合研究所

緑化生態研究室

With some exceptions, this English version is tentative one that
translated from Japanese version by automatically translation system.

Language

日本語 English

With some exceptions, this English version is tentative one that translated from Japanese version by automatically translation system.

Street Trees in Japan IX, Summary Edition

Street Trees in Japan IX

Every five years since 1982, the Greening Ecology Laboratory has conducted a survey on the current status of road greening trees through questionnaires to road greening tree managers nationwide.

The following is a summary of the results as of March 31, 2022.
（Click here for the detailed version）

1.Objective

　The purpose of this survey was to investigate the current status of road greening trees (by tall trees and medium-sized shrubs) in Japan, and to compile data by nation, region, prefecture, and road type to provide basic data for the promotion of road greening projects in the future.

2.Methods

　Questionnaires on roadside trees were distributed to prefectures, government ordinance-designated cities, local development bureaus of the Ministry of Land, Infrastructure, Transport and Tourism, Hokkaido Development Bureau, Okinawa General Bureau, and highway companies in September 2022, and were collected between October and November 2022. The survey items were the number of roadside trees managed by each road administrator by species.

（１）Roads and trees to be surveyed

　The survey covered roads managed by the Ministry of Land, Infrastructure, Transport and Tourism, prefectures, municipalities, local road corporations, and expressway companies (East Nippon Expressway Company Limited, Central Nippon Expressway Company Limited, West Nippon Expressway Company Limited, Metropolitan Expressway Company Limited, Hanshin Expressway Company Limited, Honshu-Shikoku Bridge Expressway Company Limited), which were in service as of March 31, 2022. The following roads are defined as roads in service as of March 31, 2022, managed by the following companies: Expressway Company, Limited.

（２）Geographic area classification

　The regional divisions used in the tabulation of this survey are as follows.

Hokkaido Hokkaido
Tohoku Aomori、Iwate、Miyagi、Akita、Yamagata、Fukushima
Kanto Ibaragi、Tochigi、Gunma、Saitama、Chiba、Tokyo、Kanagawa
Hokuriku Nigata、Toyama、Ishikawa
Chubu Fukui、Yamanashi、Nagano、Gifu、Shizuoka、Aichi、Mie
Kinki Shiga、Kyoto、Osaka、Hyogo、Nara、Wakayama
Chugoku Tottori、Shimane、Okayama、Hiroshima、Yamaguchi
Shikoku Kanagawa、Kochi、Ehime、Tokushima
Kyusyu Fukuoka、Saga、Nagasaki、Kumamoto、Oita、Miyazaki、Kagoshima
Okinawa Okinawa

3.Result

　The survey results were compiled by dividing them into two categories: roads managed by the Ministry of Land, Infrastructure, Transport and Tourism, prefectures, municipalities, and local road corporations, and roads managed by expressway companies (East Nippon Expressway Company Limited, Central Nippon Expressway Company Limited, West Nippon Expressway Company Limited, Metropolitan Expressway Company Limited, Hanshin Expressway Company Limited, Honshu-Shikoku Bridge Expressway Company Limited). The classification was made into the following two categories.

3.1　Roads managed by the Ministry of Land, Infrastructure, Transport and Tourism/prefectural and municipal governments/local road corporations

（１）Number

１）Number of bottles by prefecture

Figure-1 Number of tall trees by prefecture (managed by MLIT, prefectures, municipalities, and local road authorities)
図-1
Figure-2 Number of tall trees per road extension by prefecture (managed by MLIT, prefectures, municipalities, and local road authorities)
図-2
Figure-3 Number of medium-sized shrubs by prefecture (managed by MLIT, prefectures, municipalities, and local road authorities)
図-3
Figure-4 Number of medium-sized shrubs per road extension by prefecture (managed by MLIT, prefectures, municipalities, and local road authorities)
図-4

２）Number of roads by type

　The number of roads by type was calculated by prefecture, dividing the types of roads managed by the Ministry of Land, Infrastructure, Transport and Tourism, prefectures, municipalities, and local road public corporations into general national roads (directly managed), general national roads (subsidized), prefectural roads, and municipal roads.

Figure-5 Number and composition of tall trees by road type
図-5
Figure-6 Number of tall trees per road extension by road type
図-6
Figure-7 Number and composition of medium-sized shrubs by road type
図-7
Figure-8 Number of medium-sized shrubs per road extension by road type
図-8

（２）tree species

１）Tree species in Japan

Figure-9 Composition of the top 10 tallest trees by species in Japan
図-9 円グラフ 図-9 順位表
Figure-10: Composition of the top 10 species by number of medium-sized shrubs by species in Japan
図-10 円グラフ 図-10 順位表

２）Tree species by region

Figure-11 Composition of top 10 tallest trees by species by region
図-11 北海道円グラフ 図-11 北海道順位表 図-11 東北円グラフ 図-11 東北順位表 図-11 関東円グラフ 図-11 関東順位表 図-11 北陸円グラフ 図-11 北陸順位表 図-11 中部円グラフ 図-11 中部順位表 図-11 近畿円グラフ 図-11 近畿順位表 図-11 中国円グラフ 図-11 中国順位表 図-11 四国円グラフ 図-11 四国順位表 図-11 九州円グラフ 図-11 九州順位表 図-11 沖縄円グラフ 図-11 沖縄順位表
Figure-12 Top 10 Medium Shrubs by Number of Trees by Region
図-12 北海道円グラフ 図-12 北海道順位表 図-12 東北円グラフ 図-12 東北順位表 図-12 関東円グラフ 図-12 関東順位表 図-12 北陸円グラフ 図-12 北陸順位表 図-12 中部円グラフ 図-12 中部順位表 図-12 近畿円グラフ 図-12 近畿順位表 図-12 中国円グラフ 図-12 中国順位表 図-12 四国円グラフ 図-12 四国順位表 図-12 九州円グラフ 図-12 九州順位表 図-12 沖縄円グラフ 図-12 沖縄順位表

3.2 Roads managed by expressway companies (East Nippon Expressway Company, Central Nippon Expressway Company, West Nippon Expressway Company, Metropolitan Expressway Company, Hanshin Expressway Company, Honshu-Shikoku Bridge Expressway Company)

（１）Number

Figure-13 Number of Tall Trees by Expressway Company
図-13
Figure-14 Number of Tall Trees per Road Extension by Expressway Company
図-14
Figure-15 Number of medium-sized shrubs by highway company
図-15
Figure-16 Number of medium-sized shrubs per road extension by highway company
図-16

（２）tree species

１）All highway companies

Figure-17: Composition of the top 10 tallest tree species by species for highway companies
図-17 円グラフ 図-17 順位表
Figure-18 Top 10 Medium Shrubs by Species in Japan by Number of Trees
図-18 円グラフ 図-18 順位表

２）By Expressway Company

Figure-19 Composition of the top 10 tallest tree species by species for East Japan, Central Japan, and West Japan Expressway Co.
図-19 円グラフ 図-19 順位表
Figure-20 Composition of the top 10 tallest tree species by species for East, Central and West Japan Expressway Company Limited (general toll roads)
図-20 円グラフ 図-20 順位表
Figure-21 Composition of top 10 medium shrub species by species for East Japan, Central Japan, and West Japan Expressway Co.
図-21 円グラフ 図-21 順位表
Figure-22 Composition of top 10 medium shrub species by species for East Japan, Central Japan, and West Japan Expressway Company Limited (general toll roads)
図-22 円グラフ 図-22 順位表
Figure-23 Composition of the top 10 tallest tree species by species for the Metropolitan Expressway Co.
図-23 円グラフ 図-23 順位表
Figure-24 Composition of the top 10 medium shrub species by species for the Metropolitan Expressway Co.
図-24 円グラフ 図-24 順位表
Figure-25 Composition of the top 10 tallest trees by species Hanshin Expressway Co.
図-25 円グラフ 図-25 順位表
Figure-26 Composition of the top 10 medium shrub species by species Hanshin Expressway Co.
図-26 円グラフ 図-26 順位表
Figure-27 Composition of the top 10 tallest tree species by species for Honshu-Shikoku Bridge Expressway Co.
図-27 円グラフ 図-27 順位表
Figure-28 Composition of the top 10 medium shrub species by species, Honshu-Shikoku Bridge Expressway Co.
図-28 円グラフ 図-28 順位表
© Greening Ecology Lab. 2025

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