Density altitude is your altitude corrected for the effect of temperature. In this case the figures indicate that, even though you are near sea level, the air is hotter and thinner than normal and would be the equivalent of an altitude of 3250ft in an ISA atmosphere. Thin air means less thrust is available and higher groundspeeds are required to attain the same IAS. This means, in turn, that the take-off roll would be longer and climb gradients would be less than you would achieve at 200ft in standard temperatures.