Phonphalit muan chiwaphap kap sombat bang prakan khong din muangrae rang Bangmuang Takuapa Phangnga.
1986
Apiruk Anunsiriwat
Mining process affected the soil properties by increasing sandproperties by increasing sand particle, decreasing silt and clay in Sand and Gravel zone as contrasted to grass land, Grass and Casua-rina and Clay Pan. The particle density and bulk density were lower in mining areas than in the undisturbed adjacent soil. Porosity percentage was not different from the areas before mining, while gravel percentage tended to increase only in the Scrub forest. Investigation on the chemical properties of soils revealed that in the upper soil layer, the organic matter was higher than in the lower soil layer except Sand and Gravel Zone was lowest, phosphorus, potassium and calcium in all zones were grouped into low level and in Moist evergreen forest, Scrub forest and Sand and Gravel Zones were the lowest level but other zones were low level. Sulfur in Swamp forest decreased but other zones increased following the depth of soil while Grass and Casuarina, Grass land and Clay Pan were higher level. Soil pH showed the strong acidity. All phenomena might be due to the influence of tin mining process and the decomposition of litter in that area.
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