INFILTRATION CHARACTERISTICS OF SOIL UNDER CINNAMON AND ACACIA PLANTATION FOREST IN HEADWATER OF VIET NAM
Keywords:
Acacia forest, Cinnamon forest,, dye tracer, infiltration rate, spatial infiltration,, vegetation coverAbstract
For determining infiltration characteristics of soil under Cinnamon and Acacia plantation forest, double rings infiltrometer was used in 15 different locations (5 times for one part) of up - hill, mid - hill and downhill part in each kind of forest. Research was conducted from June to September 2017. Dye tracer - a new method was used to determine spatial distribution of infiltration in three plots.
The first plot had a Cinnamon tree, the second plot had an Acacia tree and the reference plot did not have any tree. Influencing factors such as dry bulk density, vegetation cover, porosity and soil moisture were also analyzed. After carrying out the research, some main findings were: (1) Infiltration rate in both kinds of forests tended to be decreased over time, the rate was the highest at the downhill and the lowest at the middle hill. Both initial and stable infiltration rate of Acacia forest (13.5 and 2.2 mm/min respectively) are higher than those of Cinnamon forest (9.0 and 1.3 mm/min respectively). The infiltration rate in both types of forests were not high and they have chance to occur overland flow; (2) Spatial infiltration distribution of dye in three plots was different, dye tended to be infiltrate with the deepest depth and the biggest area into soil at reference plot (1177 cm2 and 70 cm in 4th layer), dye tended to infiltrate bigger in Acacia plot (90 to 427 cm2) and deeper in Cinnamon plot (40 to 60 cm); (3) Infiltration rate
had positive relationship with vegetation cover, soil moisture and porosity. The findings implied that infiltration rate under Acacia plantation forest has been higher than Cinnamon forest
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