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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,}_Bon g kok, Th a il a n d

avietnom

_{Notional tJniversity of}_Agriculture,_Honoi,

_Viet

_Nam

sNorthern _{Mountainaus Agriculture}_{ond Forestry Science}

_lnstitute,

_Honoi,_{Viet Nom} 6Chinese _Academy

_of

_Tropical

_Agriculturol

_Sciences,_{Haikou, China}

TClRAD, _UMR_Eco&Sols,_Montpellier,_France sDeakin University, Melbourne, Austrolia

lndustrial agriculture

has

allowed

food

safety

through the crop

homogenization

and

the

massive

use of

pesticides and chemical fertilizers. This intensive agriculture has positively influenced

the

crop

productivity

but

has also negatively affected

the

environment

with

direct

consequences

on

soil

health

and

productivity.

The

importance

of the

micro

and macro organisms in

the

sustainability

of

soil

fertility

widely

recognized. Soil

fauna represents 23% of

the

global fauna and contributes

to

most of

the

ecosystem services such as porosity,

soil aggregation,

control

the

microbial activity and plant

protection

against pests and diseases. To mitigate

the

collateral effects

of

intensive agriculture on soil

productivity

in South East Asia, agro-ecological practices

are

currently promoted,

including

the

use

of

legumes

in

intercropping systems. We studied

the

effect

the

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 in

the

increase

of

macro fauna richness

and

evenness.

lntercropping

system also significantly enhanced

both diversity

and abundance

of

soil

micro

fauna.

The

high throughput

sequencing analysis

of

the

microbial community showed

that

bacterial

communities' abundance and richness were significantly higher in intercropping system than in mono-cropping

fields.

However,

intercropping

did not

significantly

affect

the

fungal communities

and

the

soil

parameters

including pH and organic

matter. Our

results

highlight

the

importance

of the

promotion

of

agro ecological practices such as legume intercropping systems in

the

Highlands in Northern Vietnam where the sustainability of

the

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,}_lnstitute

_of

_Soil_Science_{and Plant}

_Nutrition,

_{Christian-Albrechts-Universitdt}_zu Kiel, Kiel, Germony

3Deportment

_of

_Soil_Science

_of

_Temperate_{Ecosystems, lJniversity}_{of Gottingen, Gdttingen,}_Germony 4Chair

_of

_Soil_Physics,_lJniversity_of_{Bayreuth, Bayreuth, Germany}

stnstitute of Environmentol Sciences, Kazon Federal University, Kozon, Russio

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