Organic carbon hidden in urban ecosystems.

The relationship between urban soil OC density (beneath both impervious surfaces and greenspace) and depth was described by a highly significant negative exponential function ( R 2 = 57%, F (1, 184) = 243.8, p <0.001, y = 51.910(±2.492 S.E.)e −0.0232 (± 0.002 S.E.)× ) ( Fig. 1 ).

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