P.LL4 (will also be presented as poster pitch)
E Fouillet1,2, L Herrmann2, T Tham Nguyenl,',0, HT Thanh Nguyens, M Otieno2, S Zhong6, D Lesueur2, 7,8 1
AgroPa ri sTech, Po ris, F ro nce zctAT-Asia/ cMBP, Honoi, Viet Nom 3
Ko setsa
rt
tJ nive rsity, Bo n g kok, Th a il a n davietnom
Notional tJniversity of Agriculture, Honoi,Viet
NamsNorthern Mountainaus Agriculture ond Forestry Science
lnstitute,
Honoi, Viet Nom 6Chinese Academyof
TropicalAgriculturol
Sciences, Haikou, ChinaTClRAD, UMR Eco&Sols, Montpellier, France sDeakin University, Melbourne, Austrolia
lndustrial agriculture
hasallowed
food
safety
through the crop
homogenizationand
the
massiveuse of
pesticides and chemical fertilizers. This intensive agriculture has positively influenced
the
cropproductivity
buthas also negatively affected
the
environment
with
direct
consequenceson
soilhealth
andproductivity.
Theimportance
of the
micro
and macro organisms inthe
sustainabilityof
soilfertility
iswidely
recognized. Soilfauna represents 23% of
the
global fauna and contributesto
most ofthe
ecosystem services such as porosity,soil aggregation,
control
ofthe
microbial activity and plantprotection
against pests and diseases. To mitigatethe
collateral effectsof
intensive agriculture on soilproductivity
in South East Asia, agro-ecological practicesare
currently promoted,
includingthe
useof
legumesin
intercropping systems. We studiedthe
effect
ofthe
intercropping system cassava-cowpea (Vigno unguiculota L.) on the soil biotic compartment in Yen Bai province, a mountainous region in
the
North of Vietnam. lntercropping resulted inthe
increaseof
macro fauna richnessand
evenness.lntercropping
system also significantly enhancedboth diversity
and abundanceof
soil
microfauna.
The
high throughput
sequencing analysis
of
the
microbial community showed
that
bacterialcommunities' abundance and richness were significantly higher in intercropping system than in mono-cropping
fields.
However,intercropping
did not
significantlyaffect
the
fungal communities
andthe
soil
parametersincluding pH and organic
matter. Our
resultshighlight
the
importance
of the
promotion
of
agro ecological practices such as legume intercropping systems inthe
Highlands in Northern Vietnam where the sustainability ofthe
ecosystem is very fragile.P.115
XZhangl,NBilyera2,LFan3,PDuddeka,YKuzyakovs,MDippoldl,MAhmeda,SSpielvogel2,BSRazavi2
lDepartment of Biogeochemistry of Agraecosystems, tJniversity of Giittingen, Gottingen, Germany
2Department
of
Sail Science, lnstituteof
Soil Science and PlantNutrition,
Christian-Albrechts-Universitdt zu Kiel, Kiel, Germony3Deportment
of
Soil Scienceof
Temperate Ecosystems, lJniversity of Gottingen, Gdttingen, Germony 4Chairof
Soil Physics, lJniversity of Bayreuth, Bayreuth, Germanystnstitute of Environmentol Sciences, Kazon Federal University, Kozon, Russio