Biomass and Net Primary Production in an Imperata Grassland of Barak Valley, Assam, Northeast India

Ashim Das Astapati, Ashesh K. Das


Present study was undertaken to estimate the seasonal variations in biomass, primary productivity and dry matter transfer in a successional grassland dominated by Imperata cylindrica at Dargakona, Barak Valley, northeast India. Monthly changes in live shoot biomass exhibited a uni-modal growth pattern during the study period. Live shoots biomass during September- October was: 606.96 to 840.88 g m-2 in burnt plot; 853.75 to 511.94 g m-2 in unburnt plot. Use of fire as grassland management tool stimulated significant accumulation of belowground biomass; found as maximum in burnt plots (1368.44 g m-2). Annual aboveground net production ranged from 653.26 to 877.96 g m-2 in burnt plot and 527.12 to 936.08 g m-2 in unburnt plot. The belowground net production was: 973.79 to 1326.65 g m-2 (burnt plot) and 764.47 to 981.34 g m-2 (unburnt plot). A greater accumulation of belowground biomass and faster recycling through decomposition was found as an adaptation to maintain the grassland ecosystem. The grassland system showed net accumulation of surplus dry matter as total organic matter input into the system was greater than the total output. Imperata grassland was found to be seral in nature, which is maintained under the indigenous management system of farming community.


Burning[ Imperata cylindrica; Rhizome Biomass; Belowground Biomass; Belowground Net Production

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