Surface Soil Erosion and Surface Flow from Mixed Deciduous Forest, Chiang Doa, Chiang Mai
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Abstract
The studies on surface soil erosion and surface flow from mixed deciduous forest were carried out Chiang Dao Watershed Research Station, Chiang Mai during 1999-2000 by using 2x3 factorial with completely randomized design. Three conditions:-undisturbed (with underground), ploughed and fired forest, were assigned to be the main plot while two slope levels, 23% and 57% were treated to be the sub plots. There were two replications (2 years) in each experiment. Data on surface soil erosion and surface flow and rainfall intensity were recorded. Data analysis showed that maximum surface soil erosion and surface flow were obtained from ploughed areas. Statistical speaking, however, revealed on highly significant difference in surface soil erosion and flow among crop management conditions, but insignificant difference between slope levels and among interactions between both treatments. Average soil erodibility factors was 0.004495. Crop management factors: undisturbed, fired and ploughed forests estimated on the base of rainfall factor were of 0.05-0.20,0.10-0.59 and 1.07-4.94, respectively.
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