How to protect forest~why we practice thinning~

How to protect forest?~Why we practice thinning?~

Takatoshi AKAI

KWS Malindi Marine Park

231 JOCV/JICA

Outline• What will be happened after

thinning trees?

• Types of periodic thinning

• What will be happened to cut-downed trees?

Q: Is it good to cut tree?

1st

thinning2nd

thinningTreeGrowWell

Thin diameter

Equalized diameter

Without thinning, they looks like bean sprout

Without thinningWithout thinning Thinning treeThinning tree

Penetration[little]

Penetration[plenty]

Precipitation impact[huge]

Precipitation impact[little]

Ground flow [much]

Ground flow [little]

Before After

Retard the growth of each other by cover up and shut down light.Once shut down light, forest become dark.

After thinning trees, they grow up healthy.Also sunlight grow other plants to enhanced eco-system in the forest.

Types of periodic thinning

Selective Thinning• Main technique to grow trees.

• Focus on shape of each trees.

• Then decide which tree cut down.

• Such as slow growing tree, spindly tree, bended tree, to remain good tree.

Fixed Thinning

• Focus on density of trees.

• Then decide which tree cut down on the map, before start to cut trees.

Row Thinning• Cut down trees in line.• Cheapest and efficiently technique.• We can choose depends on the status of forest.

“3 remain, 1 thinning”: remain 3 lines and cut down 1 line,

or “4 remain, 1 thinning”: remain 4 lines and cut down 1 line.• Weak point: We focused on efficiency and do not choose tree. Therefore, it may be cut down good tree, and remain useless tree

What will be happened tocut-downed trees?

• We will use trees for build house

and other products

• We also use tips of tree for chop sticks

or charcoals.

Tips

Timber

Conclusion• Cutting tree with sustainable development

is good activity• Once thinning trees, the remained trees

become valuable products.• Thinning also avoid land slide after heavy

rain.• Thinned trees are nothing to waste, it able

to use for building material, and timber tips also able to use for chopsticks.