J H Weerarathne, B M P Singhakumara and P R Attygalle
Department of Forestry & Environmental Science, University of Sri Jayewardenepura
River Basin Planning Division, Mahaweli Authority of Sri Lanka
Dipterocarpus zeylanicus is an endemic tree found in lowland rain forests in Sri Lanka. D. zeylanicus plantations have been established in several districts in Sri Lanka by the Forest Department. The Hora plantation in Kirigala, Ingiriya, and the present study site was established in 1940 by the Forest Department. This study aims to investigate the stand dynamics of D. zeylanicus and its regeneration trends.
The 31 main plots of 10m x 10m, subplots of 5m x 5m and 2m x 2m that were used in 1998 to record the trees, saplings & seedlings numbers and the stand parameters were used in this study as well in 2003.
The results show 515 trees, 789 saplings and 551 seedlings. It is less than that what was recorded in 1998, except the number of trees has increased by approximately seven percent. The mean height, diameter at breast height and basal area of D. zeylanicus within the study site were 22 m, 31.4 cm and 0.0103m2 respectively. A significant increase in height of D. zeylanicus trees and a reduction in seedlings were observed. Ochlandra stridiula is gradually invading the plantation and affecting the stand dynamics of the D. zeylanicus.
J H Weerarathne, B M P Singhakumara - Department of Forestry & Environmental Science, University of Sri Jayewardenepura
Mahaweli Authority of Sri Lanka -River Basin Planning Division
Department of Forestry & Environmental Science, University of Sri Jayewardenepura
River Basin Planning Division, Mahaweli Authority of Sri Lanka
Dipterocarpus zeylanicus is an endemic tree found in lowland rain forests in Sri Lanka. D. zeylanicus plantations have been established in several districts in Sri Lanka by the Forest Department. The Hora plantation in Kirigala, Ingiriya, and the present study site was established in 1940 by the Forest Department. This study aims to investigate the stand dynamics of D. zeylanicus and its regeneration trends.
The 31 main plots of 10m x 10m, subplots of 5m x 5m and 2m x 2m that were used in 1998 to record the trees, saplings & seedlings numbers and the stand parameters were used in this study as well in 2003.
The results show 515 trees, 789 saplings and 551 seedlings. It is less than that what was recorded in 1998, except the number of trees has increased by approximately seven percent. The mean height, diameter at breast height and basal area of D. zeylanicus within the study site were 22 m, 31.4 cm and 0.0103m2 respectively. A significant increase in height of D. zeylanicus trees and a reduction in seedlings were observed. Ochlandra stridiula is gradually invading the plantation and affecting the stand dynamics of the D. zeylanicus.
J H Weerarathne, B M P Singhakumara - Department of Forestry & Environmental Science, University of Sri Jayewardenepura
Mahaweli Authority of Sri Lanka -River Basin Planning Division
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