Biomass Production in Plantation Ecosystem of Ailanthus excelsa at Five Different Ages in Uttar Pradesh

The biomass production of 3, 6, 11, 16 and 21 years old plantations of Ailanthus excelsa has been discussed. Regression equations were worked out, it was observed that log models of type Log y = a + b log × are well suited for the prediction purposes. The peak values of biomass 41.8 t/ha and 40.3 t/ha were obtained at the age of 6 and 11 years respectively. The decreasing biomass of leaf and twig component with increasing age has also been discussed. Study on return of nutrients in these plantations has been suggested.