International Journal of Ecology and Environmental Sciences
CARBON STOCK, SOIL CO2 FLUX AND CARBON BUDGETS OF DIFFERENT FOREST ECOSYSTEMS OF MANIPUR, NORTHEAST, INDIA
Abstract
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.
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