GROWTH RATE, BASAL AREA AND VOLUME OF CORYMBIA CITRIODORA AND CUPRESSUS SEMPERVIRENS IRRIGATED WITH TREATED WASTEWATER AT SERABIUM FOREST

Abstract

serabium forest is 15 km. far from Ismailia City at the Northern East of Egypt, which had 25 years old, irrigated by treated wastewater.The Serabium forest (129 ha) was realized using different tree species a high wood production. The study was carried out from 2009 to 2013 on four years old of Corymbia citriodora Hook. and Cupressus sempervirens L. trees planted at 3 х 3 m. spacing and irrigated by drip irrigation system of primary treated wastewater to compare the growth and wood production of two species. The results revealed that, the growth of two tree species increased gradually through 5- year affected by treated wastewater. Corymbia citriodora had tallest significant trees and biomass as compared to Cupressus sempervirens. The results also showed that, Corymbia citriodora trees gave the highest significant annual rate increment of basal area in 2010 (39.03 cm² tree¹) followed by Cupressus sempervirens (25.24 cm² tree¹). Although, Cupressus sempervirens had the highest tree volume at 2009 as compared to C. citriodora (12283.6 and 4612.6 cm³ tree¹), respectively. C. citriodora showed the highest significant tree volume in 2012 and 2013. At the end of the experiment, Corymbia citriodora gave the highest values of total volume per hectare followed by Cupressus sempervirens (79.43 and 49.18 m³ ha ¹), respectively. It could be concluded that, Corymbia citriodora gave the best growth performance followed by Cupressus sempervirens, which makes these species a valuable in many reforestation programs, especially Corymbia citriodora for shortcut rotation and Cupressus sempervirens for long cut rotation.s