Analysis of sulfate content in soil, stream water, sediment and sulfate adsorption by soil at Doi Pui and Tung Jaw in Chiengmai [Thailand]
1984
Supanee Vichyanan
Specific areas in the Royal Watershed Development Project (Tung Jaw) and The Kog Ma Watershed Research station (Dui Pui) in Chiengmai have been analysed for content over a period of time. Analysis of sulphate content in soil, stream water and sediment was done during August, 1982- May, 1983 and analysis of sulfate adsorption by soil in January, 1983. The major forms of land use, from which samples were collected, consisted of : human settlement, agriculture and reforestationarea at the Royal Watershed Development project (unit one); evergreen forest area at the Kog Ma Watershed Research Station. It was that the average sulfate content in soil at the hill evergreen forest, reforestation, human settlement and agricultural areas were: 44.00 ppm, 28.31 ppm, 21.13 ppm and 12.25 ppm respectively. Furthermore the averagesulfate content in sediment found in the above 4 areas was: 51.88 ppm, 51.50 ppm, 32.88 ppm, and 12.08 ppm respectively. Whereas the mean values of sulfate content in stream water found in the above 4 areas were: 0.36 ppm, 0.44 ppm, 0.53 ppm and 0.37 ppm respectively. Soil from the evergreen forest area showed the highest sulfate adsorption capacity, followed by soil from the reforestation, then agricultural, and human settlement areas, the least. The data showed that increasing amounts of sulfate in solution increased the tendency for the soil to adsorb sulfate
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