Effect of lopping intensity on tree growth and stand productivity in Tropical Forests

Effects of various intensities of lopping on the growth of trees, production of leafy biomass (leaves + shoots) and grass biomass production were investigated in the forests of the Western Ghats, India. Frequent complete lopping of trees resulted in a rapid drain of stored reserves leading to reduction in growth of tree girth and production of leafy biomass. Relatively greater increase in girth at the breast height of trees that were subjected to partial lopping, i.e. less than 50% intensity, was considered to be mainly the result of stimulation of remaining leaves to higher rates of photosynthesis. Opening of canopy increased the grass production in lopped quadrats. In two species, Aporosa lindleyana and Terminalia paniculata, the growth rate of girth and the yearly production of leafy biomass showed positive correlation up to 75% lopping intensity indicating that these two species can withstand lopping to some extent. For managing the forests and trees on an ecologically sustainable basis, the desired option recommended is to restrict lopping to less than 50% of the crown portion. Intensive long term studies, however, are required to suggest management practices