URBAN FOREST
What is Miyawaki Method?
A forest planted by humans, then left to nature's own devices, typically takes at least 100 years to mature.Miyawaki method of plantation creates a mini-forest ecosystem using an accelerated method. It's based on the practices of Japanese forester Akira Miyawaki, a Japanese botanist, an expert in study of Natural Forest and Restoration of Natural Vegetation.
The Miyawaki Method is one of the most effective tree planting methods for creating forest cover quickly on degraded land that has been used for other purposes such as agriculture or construction. It is effective because it is based on natural reforestation principles,i.e.,using trees native to the area and replicating natural forest regeneration processes. It has some significant benefits over more traditional forestry methods when used in smaller afforestation projects and is particularly effective in the urban environment. The trees planted by this method grow much faster, jump starting the forest creation process and capturing more carbon. Higher biodiversity has been recorded in Miyawaki forests than in neighbouring woodland, so it’s an ideal method for creating diverse forest ecosystems quickly. Within the context of the current climate change emergency and stark warnings about the global loss of biodiversity, being able to create diverse, healthy forests quickly could prove vital to meeting international targets and tackling these issues.
One of the most noticeable differences in a Miyawaki forest is that the seedlings are planted at very high densities. This replicates the regeneration process that occurs in a natural forest when a clearing in the canopy opens up due to a larger tree falling. The saplings grow very fast to compete for the light and then natural selection will favour the fastest growing individuals and act to thin out the trees. The result is a densely packed pioneer forest that grows in 20 to 30 years instead of taking 150 to 200 years. This has obvious benefits for projects that are working to maximise a forest’s carbon sequestration potential or recreate habitat for biodiversity and wildlife.
Multistratal Quasi-Natural Forest - Miyawaki method
- Planting density: 2 to 5 trees per m²
- Green surface area: 30 times more than a meadow
- Survival rate (Natural Selection): 75 to 90%
- Growth rate: 1.5 m/year [rainforest], 1 m/year [temperate forest], 0.3 m/year [Mediterranean forest]
- Final average size: 20 m [upper layer.], 4m [lower layer]
- Density after stabilization: 0.5 to 2.5 trees per m²
- Biodiversity (fauna): 18 times more (mean of different species)
Concept
A Miyawaki forest is an opportunity to take part in ecosystem restoration
- Indeed, the method takes into account ecological successions
- Allows to immediately plant an advanced forest through the choice of the most adapted plant communities
- It is called the Potential Natural Vegetation
- Cooperation between trees
- Enhances quick development and great resilience.
- Density after stabilization: 0.5 to 2.5 trees per m²
- Biodiversity (fauna): 18 times more (mean of different species)
Micro-forest benefits - Urban Forest benefits
- Temperature reduction: -2℃ minimum, locally
- Air quality improvement, pollution clustering: absorption of 15% microparticles, leaves and bark intercept dust.
- Noise reduction: -10 dB for a mature Miyawaki forest
- Health and well-being: reduction of stress, anxiety, solitude, cardio-vascular et respiratory diseases.
- Biodiversity balance: biodiversity is on average 18 times higher, pest concentration can be lower, the forest ensures transfers and biodiversity increase in urban context.
- Soils stability: the entanglement of roots forms a matrix-pillar system that retains soils
- CO2 sequestration: stock = 60 kgC/m2 forest cover, flux = 0.5 kgC/m2 forest cover/ year. 100 m² of Miyawaki forest long-term compensates one year of a Indian person's carbon emissions.
- Real estate prices: Properties with tree cover can see their price increase by a Lacs of Rupees
Miyawaki Process
A Miyawaki forest is an opportunity to take part in ecosystem restoration
- The native trees of the region are identified and divided into four layers - shrub, subtree, tree, and canopy.
- The quality of soil is analysed and biomass which would help enhance the perforation capacity, water retention capacity, and nutrients in it, is mixed with it.
- A mound is built with the soil and the seeds are planted at a very high density - three to five sapling per square meter.
- The ground is covered with a thick layer of mulch.
Why Plantation
- Improves tree cover on the river bank to reduce the effects of soil erosion and run-off of water
- Improves wildlife habitat for locally-endangered bird species and other wildlife prominent in the region
- Enhance carbon sequestration potential improving soil infiltration capacity and limit soil erosion with the plantation
- Recharge the water table and improve the water crisis of the area
- Increase the density of tree cover and prevent loss of soil moisture due to evaporate
- Improves the water catchment area and groundwater retention with the help of trees.
- Improves the amount of rainfall in the area by increasing the foliage
- Reduce the occurrence of droughts and provide better water resources to the people of the area
- Develop quality of the soil and moisture holding capacity of the air
- Safeguard biodiversity, especially migratory birds of the region improving their habitats