Adventures into theForest Ecology Laboratory

Okayama University
Graduate School of Environmental and Life Science
Faculty of Agriculture
OkayamaJapan

September 9th - January 7thCaroline Pinho

Infinite Thanks to theProfessor Sakamoto Keiji andthe Doctor Chenevier Bernard
for welcoming mein the Okayama University

Contents• Introduction of me
I. The Fieldworks
1. Introduction of the fieldworks in beech forests- Wakasugi Natural Park
- Daisen Mountain
2. Introduction of the fieldworks in Satoyama forests- Niimi Forest- Shinjo-son Forest
II. Ideas for the use of the Satoyama Forests
1. Reusing the wood
2. Involving the population• Conclusion• Acknowledgment

I . TheFieldworks

The Wakasugi Natural ParkThe Daisen Mountain

The Niimi Forest

The Shinjo-son Forest

1. Thefieldworks
in beechforests
The Wakasugi Natural Park and
The Daisen Mountain

The Wakasugi Natural Park

Researches directed byProfessor Miyazaki Yuko,
Professor Hirobe Muneto,
Professor Sakamoto Keiji,

Students
Mr. Go-san,Mr. Yamada-san
Mr. Tanaka-san

Wakasugi Forest•••••

Natural Forest
Primary forest
Dominated by Beech
Sasa kurilensis Bamboo cover
The research started 7 years ago, 2011

Mr. Tanaka-san research,« Structure and dynamics of Sasa kurilensis inunderstory of beech forest »Inside the forest••••

Particularity of steep slopes
Variation in light conditions
Various slopes conditions
Resistance of Sasa Kurilensis Bamboo
in slopes!

The Light Capture

Our works• Sasa kurilensis Bamboo recruitment• Tagging for the culms• Measuring the culm diameter
Reporting in a «data notebook»• Keeping our balance in the slopes!

••••

Capturing before the rise of the sun
Departure 3am’
Begining around 6 am’
Measuring the light conditions with aPhoton sensor• Backing at the University at 12am’The Daisen MountainResearches directed byProfessor Sakamoto Keiji
Professor Hirobe Muneto,Student
Mr. Nam-san

Daisen mountain
•
••••
••

Broad-leaved Forest
Secondary Forest
Dominated by Beech
Dwarf bamboo cover and non-coverFirst tree census in 2007
Second tree census in 20182007 – 2018, eleven years studied plot

Mr. Nam-san research,« Stand dynamics in a cool-temperate secondary
deciduous broad-leaved forest »Our work•••••••••

Trees recruitment
Searching for trees’names
Measuring the diameter
Stapling new names on the trunk
Recruiting new trees by the sameprocessus

Inside the forest«The stolen lunch»Particulary easy walk in the forest
Plat slopes and easy access
Progressing as a «snake»Calm forest• Were there any animals ?
The «Nam-san-stolen-lunch story» taught
us they were more hidden animals that
we could guess !

2 . The
fieldworks
in satoyama
forests
The Niimi Forest andThe Shinjo-son Forest

The niimi forest

Searches directed byProfessor Naoko Miki
Professor Sakamoto Keiji,
Professor Hirobe Muneto

Students
Mr. Asano-san
Mr. Maeda-san

Niimi Forest••••••

Secondary Forest
National forest in Japan
Used to be managed by Japan Government
Abandonment 50 years ago
Wide Roads for accessTwo aspects : the regeneration by sprouts oftrunks and the regeneration by seedlings

Mr. Maeda-san research,
The effect of the dwarf bamboo cover on trees
regeneration.

The fieldwork••••

2 teams
13 plots with 3 treatments
Control / Cutting / Removal
Data collect of the 3 treatments ineach plot

The recruitment• Seedlings recruitment• Searching for the new tree seedlings• Planting a «white stick» with a newnumber next to the stem

• Dwarf bamboo recruitment• Counting the number of the dwarf
bamboo stems, measuring theirlenght and stapling a new number
around the stem
• Hidden in the dwarf bamboo cover!

The Shinjo-son forest
Searches directed by
Researches directed byProfessor Sakamoto Keiji
Professor Sakamoto Keiji
Professor Yoshikawa Ken,
Professor Yoshikawa Ken,
Graduated students
Mr. Tanaka-san
Me. Nam-san

The Shinjo-sonForest••••••

Used to be a grassland
Was managed and harvested
Has been abandonedBecame a broad-leaved Forest
Now a Secondary Forest
Affecting by several issues ?

Inside the forest••••

The fieldwok delimitation• Delimitation in 20x20 m plot
• We have divided in 4 subplots of10x10m

The first fieldwork
Forest covered by dwarf bamboo
Delimitation of the plots
A tree census on the plots

The diameter and height of trees• We measured the tree diameter• Stapling new names on each trunk• We measured the height of 30 trees

Species composition of the stems in the Shinjo-son forest in November 2018

SpeciesNumberof stem

Density Relative(ha-1) density (%)

LayersUnderstory

CanopyDBH
Mean(cm)

SD(cm)CV Min Max
BA
Relative(%) (cm) (cm) (m²ha-1) BA (%)

6.6

62.9 5.1 32.2

5.1

15.6

7.5

31.3 6.6 34.4

18.5

56.7

KonaraAbemaki

17

134

425

29.3

151

14375

25.9

10.5
24

Kuri

945225

15.5

16.6

8.4

50.6 7.4

326

18.4

Nogurumi

541

125

8.6

123.2

26.7 8.4 15.1

1.5

4.6

Naragashiwa

22050

3.4

9.3

2.3

24.7 7.7

110.4

1.2

Yamaurushi

22050

3.4

6.42.1

32.8

57.9

0.2

0.6

Natsutsubaki

11025

1.7

5.1

0.0

5.1

5.1

0.1

0.3

Yamazakura

1

1025

1.7

6.9

0.0

6.9

6.9

0.1

0.3

Unknown 1

550125

8.6

7.7

0.6

1.8

Unknown 2

11025

1.7

7.1

31.2 6.3 11.9
0.0 7.1 7.1

0.1

0.3

Total

581450100

14.4

5.0 34.4

32.6

100.0

2.4

8.9

The size and height distributionof tree species in the Shinjo-sonforest

10Height distribution of tree specie

987Size distribution of tree speciesFrequency

201816Frequency

1465412103826412051015

202530

Diameter (cm)The size distribution of tree species in the Shinjo-son
secondary broad-leaved forest in November 2018

35

0
3-6

6-9

9-12

12-15

15-18

18-21

21-24

Height (m)The height distribution of tree species in the Shinjo-son
secondary broad-leaved forest in November 2018

The size and height distributionof tree species in the Shinjo-son
forest by canopy or understory
layer

Height distribution of tree species by10layers
987

Size distribution of tree species by layers

618
16
Understory

Frequency

14Frequency

205
Understory
Canopy412Canopy

103826412051015

20

253035

Diameter (cm)The size distribution of tree species by layers in the Shinjo-son secondary
broad-leaved forest in November 2018

03-6

6-9

9-12

12-15 15-18
Height (m)

18-21

21-24

The height distribution of tree species by layers in the Shinjo-son
secondary broad-leaved forest in November 2018

The three dominants tree
species of the shinjo-sonforest
Size distribution of the Konara

5432105101520253035

Diameter (cm)The size distribution of the Abemaki stems in theShinjo-son secondary broad-leaved forest in
November 2018

Size distribution of the Kuri

876543210

Frequency ofthe stem

Frequency of the stem

Frequency of the stem

Size distribution of theAbemaki stems

3,5
3

2,52
1,510,5051015202530

Diameter (cm)The size distribution of the Konara stems in theShinjo-son secondary broad-leaved forest in
November 2018

3551015202530

Diameter (cm)The size distribution of the Kuri stems in theShinjo-son secondary broad-leaved forest inNovember 201835

II . The useof thesatoyamaforests

1 . Reusingthe woodInspiration fromArt, Designand Architecture !
3 category :• 1. A Primitive approach• 2. Art piece / Masterpiece• 3. Wood as a new potential

2 . Involving thepopulation

How to involve thepopulation in the Forest
management ?

acknowledgment• Professor Keiji Sakamoto• Professor Ken Yoshikawa• Professor Miki Naoko• Professor Hirobe Muneto• Professor Yuko Miyazaki• Doctor Chenevier BernardAnd all the fantastic students with who I shared
this internship !

Open Photo Galery• Wakasugi Natural Parkhttps://photos.app.goo.gl/br6Q1B3fGcjhoMQe9• Daisen Mountainhttps://photos.app.goo.gl/KDisJmGuRLZBty7d8• Niimi Forest
https://photos.app.goo.gl/nge9dTEVt2xQrmUE9• Shinjo-son Forest
https://photos.app.goo.gl/GgfGZtBpPj4EZ1aQ8

ありがとうございました