Land use, surface runoff, soil erosion: multi-scale impact assessment of teak tree plantation management in a tropical humid mountainous agro-ecosystem

Layheang Song, PhD student within M-TROPICS CZO, defended his thesis today at GET. His thesis work was under the international double degree program between the University Paul Sabatier and the Institute of Technology of Cambodia.

Soil erosion is one of the most concerning environmental problems on the global scale. Soil erosion is increasingly driven by anthropogenic activities, in a changing climate context. The mountainous area of northern Lao PDR is prone to soil erosion, particularly after the conversion of the traditional shifting cultivation agricultural system to teak tree plantations over the last 20 years. Although tree plantations are often thought to provide ecosystem services similar to the ones supplied by natural forests, in this thesis Layheang showed that teak tree plantations managed without understory on sloping land were a significant source of soil loss and sediment transfer, leading to onsite effects such as the decline of both soil quality and agricultural production, and to offsite effects such as the contamination of stream water and dam siltation. The thesis relies on a multiple-scale approach, with in situ observation and modelling scales ranging from the point-source (1 m²) to the small catchment (0.6 km²). Mitigation measures such as understory and riparian vegetation conservation are suggested for alleviating soil erosion and enhance the erosion control ecosystem service. This information may help farmers and policymakers to adopt and promote sustainable land management practices.

Congratulations Layheang!

More news

Events

Renewal of the Memorandum of Understanding with DALaM in Lao PDR

On 9th of August 2021, Dr Nivong Sipaseuth, Director General of the Department of Agricultural Land Management (DALaM) of the Laotian Ministry of Agriculture and Forestry and Dr Eric Deharo, Representative of IRD in Laos signed the renewal of an agreement of scientific and technical cooperation between the two institutions. The signature of this agreement confirms […]

02.09.2021

Events

Nicolas Gallion has just started his M2 internship at GET within the M-TROPICS/MSEC CZO

Nicolas has been studying environmental sciences for 5 years. As part of his second year of Master’s degree at the University of Burgundy (MASTER II Soil, Water, Environment), he has the opportunity to carry out a six-month internship in collaboration with SNO M-TROPICS / MSEC in the north of Laos. His internship is part of […]

11.02.2020

Events

4th Meeting of the Indo-French project ANR ATCHA

The 4th Meeting of the Indo-French project ANR ATCHA (Accompanying The adaptation of irrigated agriculture to climate CHAnge) was held at INRA Montpellier SupAgro, campus de la Gaillarde, France, from November 4 to 7, 2019. The meeting gathered 30 participants from Montpellier, Rennes, Toulouse, Avignon and Bangalore. The meeting was followed by a field visit […]

09.11.2019

Search