Houay Pano catchment

The 60 ha Houay Pano catchment is located in northern Lao PDR, in the mountainous region of Luang Prabang, which mostly consists of hills with very steep slopes (8% of the land with slope gradient exceeding 55%). The flat and gently slope (0 to 2%) represents less than 1% of the area and is located in the valleys. Elevation ranges from 290 to 2257 m above sea level.

Houay Pano stands near the village named ‘Lak Sip’, about 10 km south-east of Luang Prabang city, along the National Road 13 and 400 km North from Vientiane.

The coordinates of the Houay Pano catchment are between 102°09’50’’E and 102°10’20’’E, 19°51’00’’E and 19°51’45’’N.

Houay Pano catchment: (a) Location in northern Lao PDR, (b) Altitudes (m a.s.l.) and weather and monitoring stations, (c) Land use in 2012, and (d) Soil types.

Climate

The climate is tropical sub-humid. It usually can be divided into 3 seasons: a dry and cold season lasting from October to February, a dry and hot season lasting from March to April and a wet and hot season from April to October. The mean annual rainfall at Luang Prabang is 1268 mm with a coefficient of variation of 28% (1960±2006). In average, about 91% of rainfall occurs between April and October.

 

Hydrology

The stream flow is permanent. Currently, 3 sub-catchments are monitored (S4, S7 and S8).

 

Geology

The most common rock types are gabbro, diorite, and basic rocks, such as schist, gneiss, and sandstone (Department of Geology and Mines, 1990-1991).

 

Soils

A detailed soil survey conducted by the Soil Survey and Land Classification Center (SSLCC) in 1996 showed that the most widespread soil groups are Acrisols, namely Alisol (FAO UNESCO system) or Ultisols (US taxonomy). They are mainly found on the slopes ranking from 8% to 50%, i.e. on most of the surveyed area.

 

Vegetation and land use

The land use gradually shifted from annual crop to teak plantations.

Areal percentages of the catchment covered by the main land uses (i.e. annual crops; annual crops associated with one or two years old teak trees; teak plantations; fallow; secondary forest; other land uses including gardens and banana) (from Ribolzi et al., 2017)