Skip to main navigationSkip to main content

MSEC / MultiScale Environmental Changes

Multi-Scale Environmental Changes

Slash and burn in Maeyom watershed,

Slash and burn in Maeyom watershed, Phrae province, North Thailand (photo: JL Janeau)

Global awareness of climate change has resulted in enhanced awareness of the fragility of natural systems and a new longer-term perspective for national and regional planning, which presents an opportunity to radically rethink approaches for agricultural production and watershed management.

The saturation of plains and deltas of Southeast Asia induce more and more pressure on mid-land.

What are the effects of land use changes in situ and downstream, on the different erosion processes (splash, sheet, gully, tillage, landslides), on the quality of soil (C org ., structure, depth, ...), on the partition runoff/infiltration, on the paths of water, recharge, flooding, water quality (physical, chemical and bacteriological), biodiversity (weeding, soil macrofauna) and rooting?

A long-term multi-scale monitoring has been established since 1998 along a rainfall gradient and a trajectory of agricultural systems, from the slash-and-burn in Laos without inputs to intensive mechanized cropping system in Thailand, through manual cultivation of cassava then Acacia mangium plantation in Vietnam.

Impacts monitoring of land use changes on water and sediment transfers, soil and water quality

Experiments at different scales of forcing variables (agricultural practices, rainfall simulation) on hydrological processes and erosion

The development of hydrological and erosion models,

The training or consolidating of national scientific communities in hydrology and small watersheds erosion

The supervision and training of students

Recommendations for the governments of these three countries.

Christian VALENTIN

Deputy director

UMR242 - Institut de Recherche pour le Développement

32, av. Henri Varagnat, 93143 Bondy cedex, FRANCE

Tel./Fax +33 (0)1 48 02 55 34


Directeur de Recherche IRD

Institut de Recherche pour le Développement (IRD)

Géosciences Environnement Toulouse (GET)

Observatoire Midi-Pyrénées (OMP)

UMR CNRS/IRD/UPS – UMR5563 du CNRS, UR234 de l'IRD

14, avenue Edouard Belin, 31400 Toulouse, FRANCE

Tél.: 33 (0)5 61 33 26 41 - Fax: 33 (0)5 61 33 25 60


Deputy Director

NAFRI - National Agricultural and Forestry Research Institute

Ban Sisangvone, Saysetta district

BP5992 Vientiane, RPD Laos


Director of Maeyom watershed station

DNP - Department of National Parks, Wildlife and Plant Conservation, Thailand

61  Phahonyothin Road, Ladyao, Chatuchak,  Bangkok 10900


Deputy head of Central analytical Laboratory (VILAS 886)

SFRI - Soils and Fertilizers Research Institute, Viêt-Nam

Duc Thang Ward - Northern Tu Liem District

Hanoi - Vietnam