the impact of rubber trees plantations on soil functional biodiversity and soil organic carbon
DESCRIPTION
This presentation on the impact of rubber tree plantations on soil functional biodiversity and soil organic carbon was given on February 2013 at the World Agroforestry Congress 2014 in New Delhi by Alain Daniel Brauman.TRANSCRIPT
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
Impact of rubber
plantation on
soil biodiversityAnnual rainfall 1500 mmDry season 4 months
Annual rainfall 1200 mmDry season 5-6 months
Annual rainfall 2000mmDry season 1month
Project funded by
French Institute for Natural Rubber (IFC)
and the companies SIPH, SOCFIN and
MICHELIN
Chachoengsao
Questions of the study
1-3 4-6 6-10 23-25Cas.
What is the temporal dynamic of
macrofauna communities
What are the main drivers of soil
macrofauna biodiversity patterns
Soil type Age
Experimental design
• Chonosequence of rubber plantations : Chachoengsao
4 groups of ages
Cassava fields as previous cropping
• The measurements have been realized in 3 different
zones, each containing one repetition of the age class and one control field
Cassava fieldGroup I
Group II
Group III
Group IV
1-3 cassava
4-6
8-12
20-25
Rubber and Agroforestry
Experimental strategy
Soil physical characteristics
C sequestration and OMSoil microbial characteristics
Soil fauna Biodiversity
0.0
4.0
8.0
12.0
16.0
20.0
Cassava RP 1-3
years
RP 4-6
years
RP 8-12
years
RP 23-25
years
Soil C content (g.kg-1)
TSBF methodology
Eveness index
1-3 4-6 6-10 23-25Cas.
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.
Population structure
B0= 29 g/m²
D0= 674 ind./m²
Cassava
B1=23 g/m²
D1= 417 ind./m²
1-3 y4-6 y
B2= 47 g/m²D2= 183 ind./m²
B3= 67 g/m²D3= 590 ind./m²
6-10 y
B4= 78 g/m²D4= 531 ind./m²
23- 25 y
Eartworms casts in old plantation
What are the drivers of this biodiversity ? Full RDA analysis
Cass
R. 1-3
R. 5-6
R. 23-25 R. 6-10
Same analysis without the age of the plantation (partial RDA)
Cass
R. 1-3
R. 5-6
R. 6-10R. 23-25
Block effect
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
THANK FOR YOUR ATTENTION