Unsaturated soil hydraulic conductivity (Kh) and soil resistance under different land uses of a small upstream watershed in Mt. Banahaw de Lucban, Philippines
2021
Garcia, R.C. | Galang, M.A.
Soil hydraulic conductivity influences hydrologic processes and the ability of watersheds to provide ecosystem services. Like most soil properties, however, it is highly spatially variable at different scales due to biophysical and anthropogenic factors. To quantify spatial variability, the study assessed the influence of land use/land cover (LULC) on soil hydraulic conductivity and compaction, as reflected by soil resistance in a small upstream watershed. Compaction was measured using a soil compaction tester and the unsaturated soil hydraulic conductivity (Kh) was estimated in the field using the inverse auger hole method. Measurements were made across six LULC: agriculture (Agri), coconut with agricultural crops (Coco + Agri), coconut with pasture (Coco + Grass), coconut with forest (Coco + Forest), reforestation area (Refo), and forest (Forest). Measurements were taken at 030 cm and 050 cm soil depths. Results showed that soil hydraulic conductivity and resistance significantly differed across LULC and soil depths. Soil resistance averages 0.83 MPa for all LULC at 030 cm depth, which was significantly lower (p = 1.184e sup 04) than 050 cm depth. Coco + forest recorded the highest soil resistance (1.01 MPa at 030 cm and 1.82 MPa at 050 cm), while Coco + Agri has the lowest resistance. Pairwise comparison of means also revealed that Forest at 030 cm depth had significantly higher (p 0.01) Kh at 1.18 cm min1 compared with other LULC across depths. Kh at 030 cm depth averages 0.57 cm min1 for all LULC, which is significantly higher (p
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