Diameter-Age Growth Curve Modelling for Different Tree Species in Drylands of North Karnataka

Abstract

Among 24 tree species tested for diameter and age relationship under Agroforestry systems of northern dry zone of Karnataka, Gompertz model fitted well for 20 species, Exponential model for 2 species, Weibull model found well suited for one species and Richards model for one species, respectively. Among the different models tried in predicting diameter growth for 24 different species Gompertz model was found better for Acacia auriculiformis (R 2 = 0.9956), Acacia catechu (R 2 = 0.9972), Acacia nilotica (R 2 = 0.9938), Bahunia purpurea (R 2 = 0.9950), Butea monosperma (R 2 = 0.9968), Casuarina equsitifolia (R 2 = 0.9979), Cassia siamea (R 2 = 0.9986), Dalbergia sissoo (R 2 = 0.9944), Delonix regia (R 2 = 0.9953), Emblica officinalis (R 2 = 0.9944), Eucalyptus citriodara (R 2 = 0.9983), Eucalyptus hybrid (R 2 = 0.9988), Hardwickia binata (R 2 = 0.9969), Anogeissus latifolia (R 2 = 0.9962).