Session 5.3 impact of rubber plantation on soil fxnal biodiversity

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1) The study examined the impact of rubber plantations of different ages (1-3 years, 4-6 years, 6-10 years, and 23-25 years) on soil macrofauna biodiversity compared to adjacent cassava fields in Chachoengsao province, Thailand. 2) Key findings include higher soil macrofauna density and diversity in rubber plantations compared to cassava fields. Significant differences were observed between young and mature rubber plantations for soil macrofauna metrics like density, structure, and diversity. 3) Statistical analysis indicated that plantation age had a stronger influence on soil macrofauna diversity patterns than soil type. Rubber plantations had a positive impact on soil macro

Education

Impact of rubber plantation on
soil macrofauna biodiversity
Brauman Alain Lafaye Marin, Perawatchara Monrawee Gay
Frederic, Chayawat Chompunut, Robain Henri, Choosai
Chutinan, Junrungreang Supaporn, Chantuma Pissamai, Trap
Jean, Nopmanee Suvannang

Objective of this study
Define the impact on soil biodiversity of rubber tree
plantation

Annual rainfall 1200 mm
Dry season 5-6 months

Impact of rubber
plantation on
soil biodiversity

Annual rainfall 1500 mm
Dry season 4 months

Chachoengsao
Project funded by
French Institute for
Natural Rubber (IFC)
and the companies
SIPH, SOCFIN and
MICHELIN

Annual rainfall 2000mm
Dry season 1month

Questions of the study
What is the temporal dynamic of
macrofauna communities

Cas.

1-3

4-6

6-10

23-25

What are the main drivers of soil
macrofauna biodiversity patterns

Soil type

Age

Group I

Cassava field

Experimental design
1-3
Group II

Group III

cassava

• Chonosequence of rubber plantations : Chachoengsao
 4 groups of ages
 Cassava fields as previous cropping
• The measurements have been realized in 3 different
4-6
zones, each containing one repetition of the age class
and one control field

8-12
Group IV

20-25

Experimental strategy
Soil physical characteristics

Soil fauna Biodiversity

TSBF methodology

Soil microbial characteristics

C sequestration and OM
20.0
16.0
12.0
8.0
4.0
0.0

Soil C content (g.kg-1)

Cassava RP 1-3
years

RP 4-6 RP 8-12 RP 23-25
years
years
years

Eveness index
this index will take
- high values when
all the communities
are close in
number
- low value when
there is a specie
that dominate the
others in number.
Cas.

1-3

4-6

6-10

23-25

Population
structure

B0= 29
g/m²

B1=23 g/m²

D1= 417 ind./m²

D0= 674
ind./m²

B2= 47 g/m²
D2= 183 ind./m²
4-6 y

1-3 y

Cassava

B3= 67 g/m²
D3= 590 ind./m²
6-10 y

B4= 78 g/m²
D4= 531 ind./m²
23- 25 y

What are the drivers of this biodiversity ?
Full RDA analysis

R. 5-6
R. 1-3

Cass
R. 23-25

R. 6-10

Same analysis without the age of the
plantation (partial RDA)

R. 5-6

R. 6-10

Block effect
Cass
R. 23-25

R. 1-3

Conclusion
Positive impact of Rubber plantation on soil macrofauna
density and diversity compare to cassava crop in
Chachoengsao province
Strong difference between young and mature
stage for all soil macrofauna descriptors
(density, structure and diversity)- Intercropping
Plantation age rather than soil typology seems the
main driver of soil macrofauna diversity pattern in
rubber plantation

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