Soil and water losses from various types of crop and conservation measures on hillslope at Mae Sa integrated watershed and forest land use project, Changwat Chiang Mai
1997
Nipon Tangtham | Aphinan Korporn (Kasetsart Univ., Bangkok (Thailand). Faculty of Forestry. Dept. of Conservation)
Soil and water losses from 4 conservation measures-bench terrace (BT), intermittent terrace (IT), hillside ditch (HD), contour bund (CB), and no measure plots (CK) were investigated using 3 replications of 5*20 m runoff plots constructed on 30 percent slope at Mae Sa Integrated Watershed and Forest Land Use Project, Chiang Mai. Soil and water losses by storm were collected from 1980-1990 with the absence of data in 1984, 1988 and 1989. Results showed that the CK plot yielded the highest average of annual soil loss (31.3 tons/ha) followed by HD, IT, CB and BT with the value of 11.7, 9.6, 8.4 and 5.0 tons/ha respectively. The average annual water loss was largest in HD (91.3 mm) followed by CK, IT, CB and BT with the value of 90.4, 86.9, 81.7 and 78.7 mm respectively.
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