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 Land use cover and land use change plays critical
role in relation to global carbon dynamics. Along with fossil fuel consumption
,land use change from forest to grazing land or agricultural
land(Deforestation) is believed to be one of the main human activities
responsible for increase  in atmospheric
concentration of GHGs, especially carbon dioxide (CO2) and methane
(CH4) (Shrestha et al., 2004b; Houghton and Hackler
1999; Lal 2004). Guo and Gifford (2002)
reported that land use conversion may disturb equilibrium of Carbon inflows and
outflows. The CO2 emission from land use change only was estimated
to be 1.7 Pg C yr-1 in 1980-1989 and 1.6 Pg C yr-1 in 1989-1998 (IPCC 2000). Houghton(2007)
estimated that Tropical deforestation may be a net source of 0.2×10-15 g C/y,
with up to 25% coming from soils.  Conversion of forest lands to
agriculture results in the release of large amount of CO2 into the
atmosphere and rapid reduction in SOC pool as reported by Hadhdoost et al. (2003) and Salinger et al.(2007).

Soil organic carbon plays significant role in global carbon cycle. It is
the largest terrestrial carbon reservoir and has maximum carbon sequestration
potential.( Batjes, 1996;Lal, 2004;Lal ,2005).
Soil organic carbon is essential for increasing soil quality and its
productivity and thus enhancing food production (Eswaran
et al., 1993). Increasing Soil carbon storage is a potential way to
reduce atmospheric concentration of carbon dioxide. At the same time, this
process provides other important benefits in terms of increased soil fertility
and productivity. Forests act as one of the largest carbon sinks and helps to
reduce atmospheric CO2 concentrations (Zhou
et al., 2006). Forest soil contains a globally significant amount of
carbon (C), approximately half of earth’s terrestrial carbon is in forests and
of this amount, about two- thirds is retained in soil pools (Dixon et al., 1994) Soil organic carbon is
normally calculated to a depth of 0-30 cm since most of it is present in the
top layer (Ravindranath et al., 2008).  The amount of SOC in the 0-30 cm layer is
about twice the amount of carbon in atmospheric carbon dioxide (CO2)
and three times that in global above ground vegetation
( Powlson et al.,2011) .

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