The aim of this study was to determine the impact of postharvest biomass remaining in the carbon concentration in the first 10 cm of soil. Three treatments were tested for handling harvest residues applied post-harvest forest to plantation forest of Pinus radiata in 22 years: (a) removal of harvest residues on the surface (X0), (b) control without removal or addition biomass residues (X1) and (c) twice the biomass ofpost-harvest residue (X2). Carbon contents were assessed monthly in the first 10 cm of soil in the first year post-treatment using the method of weight loss on ignition. After 6 months of the experiment, the remaining biomass harvest was 2.7 +/- 1.8, 37.4 +/- 3.3 and 56.9 +/- 8.6 Mg/ha in X0, X1 and X2 respectively. Despite the large initial difference in biomass residues remaining in treatment during the first year post-harvest, there was no difference in the carbon content in the soil between treatments. The average reduction of soil carbon was 68.2 %, from 67.7 +/- 12.5 Mg/ha (November 2007) to 46.2 +/- 4.4 Mg/ha (October 2008).