Tokyo's Vegetation: From Temperate Forests to Urban Green Spaces

Natural Vegetation Zone

Tokyo sits on the Kantō Plain of Honshu, in the temperate broadleaf and mixed forest biome. The potential natural vegetation comprises:

• Deciduous broadleaf trees – Japanese beech (Fagus crenata), oak (Quercus spp.), maple (Acer spp.)
• Conifers – Japanese cedar (Cryptomeria japonica), cypress (Chamaecyparis obtusa)
• Understory – Bamboo (Sasa), shrubs, wildflowers

Climate Context

Humid subtropical (Cfa) bordering humid continental (Dfa): hot, humid summers (avg. Aug 27°C/81°F); cool, dry winters (avg. Jan 5°C/41°F); ~1,500 mm annual rainfall; typhoon influence in autumn.

Urban Transformation

Intense urbanization since the Edo period (1603) has replaced >95% of original vegetation with:

• Dense built-up areas (23 special wards)
• Transport infrastructure
• Managed parks, gardens, street trees

Remaining Natural Areas

• Okutama Mountains (50 km west) – Part of Chichibu-Tama-Kai National Park; intact beech forests, wildlife (Japanese macaques, serow, black bears).
• Tama Hills – Satoyama landscape: mixed forest, rice paddies, reservoirs.
• Meiji Jingu Forest – 70-ha artificial forest (planted 1915–1920) now functioning as mature ecosystem.
• Institute for Nature Study – Preserved relict forest in Shirokanedai.

Urban Greening Efforts

Tokyo mandates green roofs on new buildings, expands pocket parks, and promotes "vertical forests" to mitigate heat island effect (urban temps 2–3°C higher than surroundings) and enhance biodiversity.