Determination of nutrients in stream-water and deposited sediment from various types of land use at SERS [Sakaerat Environmental Research Station, Thailand]
1981
Supaporn Sirisopana
The determination of nutrients in stream-water and deposited sediment from three types of land use; dry evergreen forest (Huay Wanasart), old clearing area (Huay Tayoo) and swidden area (Huay Namkhem) was done at Sakaerat Environmental Research Station (SERS) in June 1979 to May 1980. Stream-water and deposited sediment was collected at the 3rd week of each month to analyze the concentration of ammonia and ammonium (NH3-N + NH+4-N), nitrate (N0-3-N) and phosphate P03-4-P) ions. The results indicated that the concentration of NH3-N+ NH+4-N, N0-3-N and P03-4-P in stream-water and deposited sediment from the swidden area had the largest variation, smaller in the old clearing area and the smallest in the dry evergreen forest. The study also revealed that changing the land use from natural forest into land for agriculture and swidden area could affect the quality of water. Hence, protection of deforestation and introduction of suitable agricultural practices on these areas should be considered
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