Comparative study of infiltration rates under different land uses and soil conditions [Philippines]
1985
Joshi, S.P.
Four land uses in Mt. Makiling area were studied and evaluated on the basis of their efficiency for water intake. The land uses considered in this study were: forest (dipterocarp); upland crop (gabi or cassava); coconut (pure); and grassland (cogon). Soil properties were influenced by different land uses. The forested area had the lowest value of bulk density and highest value of organic matter, soil moisture content, pore space and silt content compared to the other three land uses. There was a positive correlation between the number of trees (10 cm dbh and greater or equal to cm ht) and silt content in the forested area. Likewise, the grass weight in the grassland was positively correlated with organic matter content, soil moisture content, sand and silt content. However, the number of plants in the upland crop were negatively correlated with organic matter, sand and silt content and positively correlated with bulk density. The forested area was found to have the highest initial and final infiltration rates, while the upland crop had the second highest initial and final infiltration rates. The relation between initial infiltration rate and different independent variables, and between final infiltration rate and different independent variables were found to be linear and curvilinear with high coefficient of determination R2. Regressions equations were developed and validated for both initial and final infiltration rates for all land uses
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