Effect of goat grazing on some hydrologic properties of the soil and ecological conditions on a Benguet pine stand with different densities [Philippines].
1984
Veracion V.P. | Penafiel S.R.
Surface runoff and sediment yield were significantly higher in the heavy thinning plots than in the light thinning and control plots. This means that the heavy thinning plots were the highest contributors of surface runoff and sediment yield. This could be attributed to the least number of Benguet pine trees left after thinning in heavily thinned plots. The lowest amount of surface runoff and sediment yield was observed in the control plots. There was a better protection of the soil surface in the control plots because the trees were left unthinned. Surface runoff and sediment yield in the intermediately and lightly thinned plots were of the intermediate levels. However, there were no significant differences in surface runoff and sediment yield produced, respectively, by the heavily and intermediately thinned plots and by the intermediately thinned, lightly thinned and unthinned (control) plots. In terms of the amount of forage utilized by the goat grazing and the forage production, no significant variations were found between plots. The experimental animals decreased in weight. This could be explained by the scarcity of forage in the plots as affected by the dry season prior to grazing and the continuous rain during the grazing period which limited the animal's grazing capacity.
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