growth and wood characteristics of acacia mangium grown in kerala

4.2.1. Height-diameter relationshipThe measured values of DBH and height (Appendix 4) are subjected to simplelinear regression (SLR) analysis and a highly significant height-diameterrelationship was developed (Appendix 5). Accordingly, the diameter andheight growth of trees are related by the fo1lowing equation with an R 2 valueof 92.4 percent.Log (Height) = 0.708 + 0.716 Log (DBH)This equation can be utilised for arriving at an estimated figure for height ofthe tree from DBH value. DBH values for different age groups and thecorresponding estimated tree height values calculated by using the aboveequation are given in Table 5.4.2.2. Seasonal growth trendSeasonal height growth curves for initial three years (204 to 1299 days afterplanting (DAP)) is presented in Fig. 3. The graph clearly shows continuousheight and diameter growth irrespective of season. The growth rate is relatedto soil moisture, associated with monsoon giving rise to two different rates ofgrowth during a vear./)69 OAPic,Fig.3. Height and diameter growth trend in Acaciamangium during initial three years at Nilambur22