An evaluation of natural regeneration in a Benguet pine (Pinus kesiya Royle ex Gordon) stand after logging in Abra [Philippines]
1980
Lirios, L.C.
Results showed that 8% of the variation in density of natural Benguet pine regeneration was caused by variation in air temperature, rainfall, elevation, soil nitrogen, soil texture (clay and sand fraction), soil depth of A horizon, and soil moisture. About 50% of the variation in density was caused by air temperature, rainfall, and elevation. About 86.78% of the variation in height of natural Benguet pine regeneration was caused by variation in clay content, soil depth, air temperature, soil pH, soil nitrogen and phosphorus, sand content of soil, soil moisture, rainfall and light intensity. Clay content, soil depth of A horizon and air temperature accounts for 54% of the variation in height of regeneration. Likewise, 55% of the variation in diameter was caused by variation in soil clay, depth of A horizon and air temperature. The addition of other variables like rainfall, soil pH, nitrogen content, phosphorus, potassium, moisture and sand content, slope of regeneration plot and light intensity increased the coefficient of determination to 82.27%. Vegetation analysis showed that Themeda triandra was the dominant species in the study areas. Benguet pine regeneration were observed to exhibit better growth (diameter and height) when growing with thick grasses. However, density in these areas was very low
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