Amrabati Thokchom, P.S. Yadava


Carbon stock and soil CO2 flux   in the  vegetation-soil components were assessed in  tropical, sub-tropical and temperate forest ecosystems of Manipur, Northeast India. Carbon stock in the aboveground biomass was recorded to be  highest in the sub-tropical forest (319.18 Mg ha-1) followed by temperate (54.45 Mg ha-1) and tropical forest (38.35 Mg ha-1) whereas soil organic carbon stock was highest in temperate forest (65.13 Mg ha-1) and lowest in tropical forest (21.64 Mg ha-1) up to the depth of 1m.  The rates of carbon sequestration was in the order of the tropical>temperate> sub- tropical forest and the  rate  of soil CO2 flux was estimated to be  highest in tropical and lowest in temperate forest. Regression analysis shows that annual soil CO2 flux was highly influenced by soil moisture, soil temperature and soil organic carbon as well as by C stocks in aboveground biomass. The annual carbon budget of the tropical, sub-tropical and temperate forest shows that 11.41 Mg C ha-1,9.84 Mg C ha-1 and 10.34 Mg C ha-1 was captured by the vegetation through photosynthesis, while 10.36 Mg C ha-1 ,5.84 Mg C ha-1 and 8.07 Mg C ha-1 was released into the atmosphere  through  CO2 emissions from soil due to root and microbial respiration thereby a net balance of 1.05 Mg C ha-1 yr-1 ,1.77 Mg C ha -1 yr-1 and 2.27   not ( 4.50) Mg C ha-1 yr-1 was being retained in the forest ecosystems. Thus our study indicates that these forests have a huge potential in the reduction of carbon dioxide levels in the atmosphere and could be used as C-sinks in the Northeast India depending upon the level of protection.


carbon sequestration, carbon budget, carbon stock, soil CO2 flux



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