Litter fall production pattern and leaf litter decomposition rate from three dominant tree species found in a subtropical semi ever green riparian forest of Dikhu river, north east India
Devlin Leishangthem, MR Singh
Litter fall and leaf decomposition rates from a subtropical semi-evergreen riparian forest of Dikhu river, Nagaland, north east India were studied from three dominant tree species viz., Melia azedarach L., Terminalia chebula Retz. and Duabanga grandiflora (DC.) Walp. Found at upper, middle and lower zone of the river. Total annual litterfall range from 9.55 – 16.99 t ha-1 yr-1. Maximum litterfall occurred during winter season. Percentage contribution of leaf litter fall for T. Chebula, M. azedarach and D. grandiflora were 57.35 %, 25.05 % and 17.4 % respectively. Annual decomposition rate lies within the range 0.92 – 1.51k yr-1. D. grandiflora decomposed at faster rate followed by M. azedarach and T. chebula. Value of the turnover rate (0.923) indicates that the riparian forest floor is characterized by a high replacement rate. There exist a significant relationship between abiotic variables with litterfall production and decomposition of leaf litter.