A study was conducted on the impact of forest clearance on discharge from newly established Hopea odorata plantations catchment (14.4 ha). The stands were two years old when this study commenced in year 2006 and the data collection was carried out for two years. The forested catchment (C3) was clear-cut during the preparation of the forest plantation and catchment C1 was left undisturbed. Discharge and rainfall were measured continuously for two years. The discharge measured from years 1997 to 2003 was used also to determine the water yield before and after forest clear-cut. This study showed that the plantation catchment is more responsive to storm with higher total water yield than in the forested catchment. The effect of forest clear cutting to discharge was clearly shown by the increment in the amount following the clear-cut activities and time taken for the recovery of the discharge back to its original state was almost three years. The peak discharge in C3 also was affected in which the biggest change was obtained during the forest clear-cutting period compared with during calibration and after clearing periods. This study is useful as basis for improving the existing guidelines on forest plantation establishment. 1. Introduction The effects of deforestation on catchment hydrology are dependent on the removal of dominant plant species and the climate [1]. In catchments that receive high rainfall and have tall vegetation, streamflow is a useful indicator of hydrological responses to land-use change [2]. Increase in water yield would be expected following deforestation or removal of forest cover. The magnitude of increase varies with the annual rainfall and the proportion of cover removed [1]. In Malaysia, the main conversion of forest is from lowland forest to agriculture, especially rubber and oil palm plantations, which started in the early 1960s. The study on hydrological parameters by Abdul Rahim [3] on the conversion of secondary dipterocarp forest to cocoa and oil palm plantations at Sungai Tekam, Pahang, revealed that the highest increases in water yield occurred in the second and fourth years after treatment with 157% and 470% of increments, respectively (？mm？yr？1). The forested catchment had been subjected to timber logging, clear felled, burning of logs, road construction, and tree plantings. Another study carried out by Abdul Rahim and Harding [4] at Berembun Watershed, Negeri Sembilan, showed the effects of selective logging (commercial and supervised) on water yield and streamflow. They found significant water yield increases in both
References
[1]
M. D. Newson, Land, Water and Development: Sustainable Management of River Basin System, Routledge, London, UK, 1997.
[2]
R. C. Ward and M. Robinson, Principles of Hydrology, McGraw-Hill, London, UK, 2000.
[3]
N. Abdul Rahim, “Water yield changes after forest conversion to agricultural landuse in Peninsular Malaysia,” Journal of Tropical Forest Science, vol. 1, no. 1, pp. 67–84, 1988.
[4]
N. Abdul Rahim and D. Harding, “Effect of selective logging methods on water yield and streamflow parameters in Peninsular Malaysia,” Journal of Tropical Forest Science, vol. 5, pp. 130–154, 1992.
[5]
A. Malmer, “Water-yield changes after clear-felling tropical rainforest and establishment of forest plantation in Sabah, Malaysia,” Journal of Hydrology, vol. 134, pp. 77–94, 1992.
[6]
A. E. Brown, L. Zhang, T. A. McMahon, A. W. Western, and R. A. Vertessy, “A review of paired catchment studies for determining changes in water yield resulting from alterations in vegetation,” Journal of Hydrology, vol. 310, no. 1–4, pp. 28–61, 2005.
[7]
F. Guillemette, A. P. Plamondon, M. Prévost, and D. Lévesque, “Rainfall generated stormflow response to clearcutting a boreal forest: peak flow comparison with 50 world-wide basin studies,” Journal of Hydrology, vol. 302, no. 1–4, pp. 137–153, 2005.
[8]
C. Fernández, J. A. Vega, J. M. Gras, and T. Fonturbel, “Changes in water yield after a sequence of perturbations and forest management practices in an Eucalyptus globulus Labill. watershed in Northern Spain,” Forest Ecology and Management, vol. 234, no. 1–-3, pp. 275–281, 2006.
[9]
D. F. Scott and F. W. Prinsloo, “Longer-term effects of pine and eucalypt plantations on streamflow,” Water Resources Research, vol. 45, no. 7, Article ID W00A08, 2009.
[10]
Y. Alila, P. K. Kura？, M. Schnorbus, and R. Hudson, “Forests and floods: a new paradigm sheds light on age-old controversies,” Water Resources Research, vol. 45, no. 8, Article ID W08416, 2009.
[11]
H. P. Ganatsios, P. A. Tsioras, and T. Pavlidis, “Water yield changes as a result of silvicultural treatments in an oak ecosystem,” Forest Ecology and Management, vol. 260, no. 8, pp. 1367–1374, 2010.
[12]
J. Kinal and G. L. Stoneman, “Hydrological impact of two intensities of timber harvest and associated silviculture in the jarrah forest in south-western Australia,” Journal of Hydrology, vol. 399, no. 1-2, pp. 108–120, 2011.
[13]
B. X. Dung, T. Gomi, S. Miyata, R. C. Sidle, K. Kosugi, and Y. Onda, “Runoff responses to forest thinning at plot and catchment scales in a headwater catchment draining Japanese cypress forest,” Journal of Hydrology, vol. 444-445, pp. 51–62, 2012.
[14]
S. Noguchi, N. Rahim, S. Saifuddin, M. Tani, T. Sammori, and M. Tani, “Hydrological characteristics of tropical rain forest in peninsular Malaysia (1)-general hydrological observations on a hillslope,” in Proceedings of the International Symposium on Forest Hydrology, Tokyo, Japan, October 1994.
[15]
F. W. Roe, “The geology and mineral resources of the Fraser's hill area Selangor, Perak and Pahang, Federation Malaysia with an account of the mineral resources,” Memoir No. 5, Geology Survey Department Federation of Malaya, 1951.
[16]
S. Saifuddin, N. Abdul Rahim, and M. F. Abdul Rashid, “Establishment and physical characteristics of Bukit Tarek watershed,” FRIM Research Pamphlet, vol. 110, pp. 1–51, 1991.
[17]
S. Saifuddin, Hubungkait kiantara ciri-ciri morfometri dan sebahagian parameter hidrologi di tadahan berhutan, Tesis Ijazah Sarjana Sastera, Universiti Kebangsaan Malaysia, Bangi, Malaysia, 1994.
[18]
J. D. Hewlett and A. R. Hibbert, “Factors affecting the response of small watersheds to precipitation in humid area. I,” in Proceedings of the International Symposium on Forest Hydrology, W. E. Sopper and H. W. Lull, Eds., pp. 275–290, Pergamon Press, New York, NY, USA, 1967.
[19]
M. P. Mosley, “Subsurface flow velocities through selected forest soils, South Island, New Zealand,” Journal of Hydrology, vol. 55, no. 1–4, pp. 65–92, 1982.
[20]
D. Gujarati, “Use of dummy variable in testing for equality between sets of coefficients in two linear regression: a note,” The American Statistician, vol. 24, no. 1, pp. 50–52, 1970.
[21]
J. D. Hewlett, “Forests and floods in the light of recent investigation,” in Proceedings of the Canadian Hydrology Symposium on Hydrological Processes of Forested Areas, New Brunswick, Canada, June 1982.
[22]
J. D. Hewlett and R. Doss, “Forests, floods and erosion: a watershed experiment in the southeastern Piedmont.,” Forest Science, vol. 30, no. 2, pp. 424–434, 1984.
[23]
B. F. Swindel and J. E. Douglass, “Describing and testing nonlinear treatment effects in paired watershed experiments.,” Forest Science, vol. 30, no. 2, pp. 305–313, 1984.
[24]
Y.-J. Hsia, “Changes in storm hydrographs after clearcutting at a small hardwood-forested watershed in Central Taiwan,” Forest Ecology and Management, vol. 20, no. 1-2, pp. 117–133, 1987.
[25]
R. C. Sidle, S. Sasaki, M. Otsuki, S. Noguchi, and N. Abdul Rahim, “Sediment pathways in a tropical forest: effects of logging roads and skid trails,” Hydrological Processes, vol. 18, no. 4, pp. 703–720, 2004.
[26]
J. N. Negishi, R. C. Sidle, A. D. Ziegler, S. Noguchi, and N. A. Rahim, “Contribution of intercepted subsurface flow to road runoff and sediment transport in a logging-disturbed tropical catchment,” Earth Surface Processes and Landforms, vol. 33, no. 8, pp. 1174–1191, 2008.
[27]
L. A. Bruijnzeel, “Hydrological functions of tropical forests: not seeing the soil for the trees?” Agriculture, Ecosystems and Environment, vol. 104, no. 1, pp. 185–228, 2004.
[28]
M. J. Waterloo, J. Schellekens, L. A. Bruijnzeel, and T. T. Rawaqa, “Changes in catchment runoff after harvesting and burning of a Pinus caribaea plantation in Viti Levu, Fiji,” Forest Ecology and Management, vol. 251, no. 1-2, pp. 31–44, 2007.
[29]
A. A. Webb, A. Kathuria, and L. Turner, “Longer-term changes in streamflow following logging and mixed species eucalypt forest regeneration: the Karuah experiment,” Journal of Hydrology, vol. 464-465, pp. 412–422, 2012.
[30]
M. Zhang, X. Wei, P. Sun, and S. Liu, “The effect of forest harvesting and climatic variability on runoff in a large watershed: The case study in the Upper Minjiang River of Yangtze River basin,” Journal of Hydrology, vol. 464-465, pp. 1–11, 2012.
[31]
S. Noguchi, N. Abdul Rahim, and M. Tani, “Runoff characteristics in a tropical rain forest catchment,” Japan Agricultural Research Quarterly, vol. 39, no. 3, pp. 215–219, 2005.
[32]
R. K. Rai, A. Upadhyay, and V. P. Singh, “Effect of variable roughness on runoff,” Journal of Hydrology, vol. 382, no. 1–4, pp. 115–127, 2010.
[33]
S. Noguchi, A. R. Nik, Z. Yusop, M. Tani, and T. Sammori, “Rainfall-runoff responses and roles of soil moisture variations to the response in tropical rain forest, Bukit Tarek, Peninsular Malaysia,” Journal of Forest Research, vol. 2, no. 3, pp. 125–132, 1997.
