Effects of initial spacing on some allometric characteristics of 12-year-old Quercus castaneifolia plantation in central Mazandaran, Iranian Caspian forests

Authors

1 O. Rafieyan*1, A. A. Darvishsefat2, S. Babaii1, A. Mataji1

2 E. Ebrahimi1

Abstract

The effects of initial spacing layout on some allometric characteristics of 12-year-old Quercus castaneifolia trees grown in Central Mazandaran, north of Iran were examined. Trees were planted in 5 different layouts (1?1, 1.5?1.5, 2?2.5, 2?3 and 4?4 m). Tree height, diameter at breast height, natural pruning height and the survival of trees were recorded in each sample plot. Tree basal area and H/D ratio and standing volume were calculated for all trees. The results of statistical analysis showed that increasing in spacing level from 1?1 to 4?4 significantly increased the average diameter at breast height from 6.93 to 12.42 cm and survival from 53% to 85%. The average tree basal area per ha decreased from 19.98 m2ha-1 to 6.43 m2ha-1 and H/D ratio from 151 to 77 when the distance between trees increased from 1 ? 1 to 4 ? 4 m. but spacing regime had no significant effect on tree height and natural pruning height. It can be concluded that on the basis of standing volume, H/D ratio and survival rate, the best plantation spacing in this research station was 2 m ? 3 m. Statistically, about 95% of the changes in sediment yield was due to the effect of increased dry land farming area in the basin (R2= 0.95, ? < 0.05).

Keywords


Ahmadi, H. (2008) Applied geomorphology, Volume 1 (water erosion), Second Edition, Tehran University Publications, 668 pp.
 
Arnaez, J., Lasanta, T. (2006) Factors affecting runoff and erosion under simulated rainfall in Mediterranean vineyards. Soil & Tillage Research, 83: 321-336.
 
Begueria, S., Vicente, S.M. (2006) Mapping the hazard of extreme rainfall by Peaks-over-threshold extreme value analysis and spatial regression techniques. Journal of Applied Meteorolgy, 45: 108-124.
 
Casasnovas, J.A.M., Bosch, I.S. (2000) Impact assessment of changes in land use/conservation practices on soil erosion in the Penedes-Anoia vineyard region (NE Spain). Soil & Tillage Research, 57: 101-106.
 
Cocos, A.,O, Cocos and Sarbu, I. (2011), Patterns of flow evolution in the central area of the Romanian plain, Caspian Journal of Environmental Sciences, 9: 81-95.. Gaya, U,I, Audu, A, A. (2005) Effect of Irrigation on Soil Properties in Jakara Kano, Nigeria, Caspian Journal of Environmental Sciences, 3(2) 2 99 – 106.
 
Globevnik, L., A. Sovnic, H. Wheater,, Kirby. C. (2006) Impact of catchment land use change on river flows. Proceeding of the British Hydrological Society International Conference, Yasouri et al., 271Hydrology in changing environment, 1:525-533.
 
Goldman, S.J., K. Jakson, and T.A. Bursztynsky, (2004) Erosion and Sediment Control Handbook, Mc Graw-Hill Book Co. New York.
 
Kasa, M., Marutani, T., Reid, L. (2001) Estimation of temporally averaged sediment delivery ratio using aggradational terraces in headwater catchments of the Waipaoa River, North Island, New Zealand. Journal of Earth Surface Processes and Land forms,26: 1-16.
 
Kim, Y., Engel, B. A. (2002) Runoff impacts of land-use change in Indian River Lagoon Watershed. Journal of Hydrologic Engineering, 7: 245-251.
 
Lu, X.X. and Higgitt, D.L. (2005) Sediment delivery to the Three Gorges, Journal of Geomorphology, 91:157-169.
 
Lyon, J., (2006) GIS for Water Resources and Watersheds management. Taylor & Francis, London. Mahdavi, M. (2007) Applied hydrology, volume 2, seventh edition, Tehran University Publications, 401 pp.
 
Mirabolghasemi, H., Morid, S (1999) Investigation of hydrological approaches in estimation of rivers suspended loads, magazine of water development resources, water affairs seasonal paper, power ministry, fourth year, 3: 54-67.
 
Mirzaii, M. (2007) Comparing the statistical approaches in estimation of rivers suspended loads, watershed management M.Sc Thesis, Natural Resources Faculty, Tehran University, 182 pp. National Resources Conservation System (2003) A Method for Estimating Volume and Rate of Runoff in Small Watersheds, Technical paper No. 149, USDA-NRCS, Washington, D.C, USA.
Van Ramapaey, A., Govers J., Puttemans, C, (2002) Modelling land use changes and their impact on soil erosion and sediment supply to rivers. Journal of Earth Surface Processes and Landforms, 27:481-494. Jafarian Jeloudar,
 
Z., Arzani, H., Jafari, M., Kavian, A., Zahedi, Gh., Azarnivand, H. (2010) Vegetation community in relation to the soil characteratics of Rineh rangeland, Caspian Journal of Environmental Sciences, 8: 141-150