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Robin In mixed stands, the effect of acacia introduction on Po and LMWOAs composition is more pronounced in high P than in low P soil, due to a much better N2 fixation

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Kittima Waithaisonga,b,c, Agnès Robinb,d,f, Louis Mareschalb,e, Jean-Pierre Bouilletb,e, Jean-Paul Laclaube, José Leonardo de Moraes Gonçalvesf, Manon Villeneuveb,g, Philippe Deleportebe, Claude Plassarda,b

aINRA, UMR Eco&Sols, 2 place Viala, 34060 Montpellier, Cedex 1, France

bEco&Sols, Univ Montpellier, CIRAD, INRA, IRD, Montpellier SupAgro, Montpellier, France

cDepartment of Microbiology, Faculty of Science Silpakorn University-Sanam Chandra Palace Campus 6 Rajamankha Nai Road, Amphoe Muang Nakhon Pathom 73000, Thailand

dCIRAD, UMR Eco&Sols, 13418-900 Piracicaba SP, Brazil

eCIRAD, UMR Eco&Sols, 34060 Montpellier, Cedex 1, France

fESALQ, Univ São Paulo, 3418-900 Piracicaba SP, Brazil

gIRD, UMR Eco&Sols, 2 place Viala, 34060 Montpellier, Cedex 1, France

Introduction of a N2-fixing tree (Acacia mangium) in eucalypt plantations has the potential to increase eucalypt wood production through increased N input due to biological N2 fixation. However, the effect of acacia intercrop on phosphorus cycle is poorly understood.

The main objective of this study was to investigate the modification of organic P (Po) and organic acids (LMWOAs) forms in soils under the influence of acacia.

We hypothesized that Po and LMWOAs may change in the mixed stands due to the introduction of acacia, affecting P availability, and that this response might be different depending on the status of nutrients in soils.

N2-fixing trees (Acacia mangium) introduce in eucalypt plantations modify rapidly the pools of organic P and low-molecular-weight organic acids (LMWOAs) in tropical soils contrasted for their C/P stoichiometry

• Itatinga, Brazil (6-year-old, Oxisols, sandy soil)

C, N, P

• Kissoko, Congo (7-year-old, Arenosols, sandy soil) C, N, P

© A. Robin

In mixed stands, the effect of acacia introduction on Po and LMWOAs composition is more pronounced in high P than in low P soil, due to a much better N2 fixation. Our results highlight that the introduction of a legume tree is able to strongly modify the composition of Po and LMWOAs in soil even after a first short-time rotation.

CONCLUSIONS

Copyright © 2019. Agnès Robin [email protected]

Eucalyptus grandis and Acacia mangium plantations 3 Treatments, sampled in 3 blocks:

• 100E

• 100A

• 50E : 50A (near eucalyptus and acacia trees)

Methods

• Colorimetric P determination (NaOH-Pi = Pm and NaOH-Po = Po)

• Ion chromatography (Waithaisonget al., 2015) to characterize organic P (Po) and low molecular weight organic acids (LMWOAs) forms

Kissoko (Congo), high P soil Itatinga (Brazil), low P soil

100E 100A

50E:50A

200 40 6080 100120 140160 180

Pm

mg Kg‐1 Po

Po LMWOAs

Soil sampling in 2 sites

100E 100A

50E:50A

200 40 6080 100 120140 160 180 mg Kg‐1

Pm Po

Po LMWOAs

Références

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