Planting density and production structure of two-year old Azadiracta indica A. Juss. var. Siamensis valenton. Plantation
1989
Pongsak Sahunalu | Pricha Dhanmanonda | Bunyarit Puriyakorn (Kasetsart Univ., Bangkok (Thailand). Faculty of Forestry. Dept. of Silviculture)
Experimental stands were planted in 1983, with eight different grades of density: 40,000 (0.50*0.50 m spacing); 17,778 (0.75*0.75 m spacing); 10,000 (1.00*1.00 m spacing); 4.445 (1.50*1.50 m spacing); 2,500 (2.00*2.00 m spacing); 625 (4.00*4.00 m spacing); 278 (6.00*6.00 m spacing) and 157 (8.00*8.00 m spacing) trees/hectare. Enumeration of all trees for each stand density at two-year old. Vertical distribution of stem biomass decreased monotonously upwards in all stand density, whereas biomass of branch attained the maximum at lower level and maximum leaf biomass at upper canopy. Mean relative light intensity were inversly correlated to the cumulative biomass of leaf and leaf area index following the Beer-Lambert law. Biomass of stem, branch, leaf, wood and total above ground components would be estimated appropriately by using the square of diameter at ground level multiplied by total height of tree (D*[2)oH) as the independent variable of the allometric relation except biomass of branch in the density of 40,000 and 2,500 trees/hectare would be estimated appropriately by using the diameter below the first living branch (DB). Mean biomass of each part of tree was inversely correlated to stand density following the competition-density effect. Mean biomass per tree for stem, branch, leaf, wood and total above ground part of 2-year old Azadirachta indica A. Juss. var. Siamensis. Valenton planted with the density of 625 trees/hectare were the highest with 2.435, 0.220, 1.174, 2.778 and 3.752 kilograms/tree respectively, Biomass yield of each part per area of plantations were directly correlated to stand density following the Yield-Density effect and the plantation planted with the density of 10,000 trees/hectare had highest yield per area for stem, branch, leaf, wood and total above ground part of 11.796, 1.088, 4.087, 12.528 and 15.724 tons/hectare respectively.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by Kasetsart University