2. The study area
The study area, the Upper Namphong watershed (UNW) lies between 101.61-102.68 east longtitudes and 16.33-17.24 north latitude and covers an area of about 4,424 km2. (Fig 1) Physiographically, the elevation ranges from 180m to 1,300m, consisting small hill and gently undulating topography. The forest includes mixed deciduous, dry dipterocarp and evergreen types, mostly found on the mountain area. The degraded forest and re-growth can be found within the
forest areas. The forest fragments of dry dipterocarp type distribute sporadically in the gently undulating topography. The annual rainfall ranges from 1,100-1,600 m.m. with mean of 1,200 m.m. Geologically, the area is underlain by Korat geologic group formed by thick sequence of Mesozoic rocks raning in age from upper Triassic to Tertiary. The majority of land use on the gently undulating alluvial plains is restricted to paddy field, caravan and sugar-cane with intensive farming of vegetables in the dry period where irrigation is available. The soils are inherently low in fertility and have coarse texture for the gently undulating plain. The soils formed on the hills are complex and classified as slope complex mapping unit
2. The study areaThe study area, the Upper Namphong watershed (UNW) lies between 101.61-102.68 east longtitudes and 16.33-17.24 north latitude and covers an area of about 4,424 km2. (Fig 1) Physiographically, the elevation ranges from 180m to 1,300m, consisting small hill and gently undulating topography. The forest includes mixed deciduous, dry dipterocarp and evergreen types, mostly found on the mountain area. The degraded forest and re-growth can be found within theforest areas. The forest fragments of dry dipterocarp type distribute sporadically in the gently undulating topography. The annual rainfall ranges from 1,100-1,600 m.m. with mean of 1,200 m.m. Geologically, the area is underlain by Korat geologic group formed by thick sequence of Mesozoic rocks raning in age from upper Triassic to Tertiary. The majority of land use on the gently undulating alluvial plains is restricted to paddy field, caravan and sugar-cane with intensive farming of vegetables in the dry period where irrigation is available. The soils are inherently low in fertility and have coarse texture for the gently undulating plain. The soils formed on the hills are complex and classified as slope complex mapping unit
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