Soil Organic Carbon (soc): A Proxy to Assess the Degree of Anthropogenic and Natural Stress

The carbon budget of planet earth is regulated by the soil compartment in all types of ecosystems. We conducted a first order analysis of soc in November 2017 both in the mangrove dominated Indian Sundarbans and the highly urbanized city of Kolkata with the aim of identifying the natural and anthropogenic contributions of organic carbon in soil. We also attempted to analyze the spatial variation of soc between these two significantly different ecosystems. We observed a comparatively higher mean value of soc in Kolkata (2.06%) than in the Sundarbans (1.25%). The significant spatial variation in soc between Kolkata and the Sundarbans (p < 0.05) may be attributed to anthropogenic stress, which is of greater magnitude in the city of Kolkata. The significant spatial variation in soc between north and south Kolkata (p < 0.05) is due to the efficiency of the drainage system in the north and the magnitude of city limit expansion in the south. In the Sundarban deltaic complex, a natural phenomenon like erosion seems to be a determining factor in the domain of soil carbon dynamics. soc analyses of all major metropolises around the world, of which Kolkata is one, are essential to understand the carbon sequestration potential of urban soils.