Knowledge about carbon storage changes at the landscape scale provides vital information for making strategies and planning of watersheds regarding to carbon cycle and its importance to greenhouse gas emissions. This concern is needed to be paid attention in the northern zone of Iran with natural and historical Hyrcanian forests, which have been changed to other land uses such as orchards and cultivation. Therefore, this study was conducted to investigate the effects of land use change on spatial variability of soil organic carbon in various fractions, and some chemical and physical soil properties in Langarud and Lahijan, Gilan province, Iran. Three common land uses in the studied area, included natural forest, tea garden and rice fields were selected, while 100 soil samples were taken from 0 to 10 cm depth from these land uses in a regular pattern. After collecting samples, in laboratory some soil physical and chemical characteristics including pH, electrical conductivity (EC), bulk density (?b), percentage of stable aggregates in water, particle size distribution (soil texture), percentage of gravel, calcium carbonate equivalent (CCE) as well as particulate organic matter (POM) and organic matter and nitrogen in various particle sizes were measured. The results showed that the particulate organic carbon and the total particulate nitrogen in the size of the sand fraction were higher significantly in the forest land use rather than other ones. Carbon enrichment factor was much higher in forest and POM compared to other fractions and land uses. Also, our results indicated that organic carbon associated to aggregates was the highest in forest land use and in macro-aggregates too. The results of aggregate stability analysis showed that in cultivated lands because of tillage practices aggregate stability has been declined and subsequently the highest aggregate stability was observed in forest ecosystem. Moreover, land use had significant effects on clay-organic complexes, as well as the highest and lowest clay-organic complexes were observed in rice cultivation and forest land sues, respectively. For evaluating of spatial analysis of SOC, MWD and OC distributed in various aggregates, exponential model was flitted to semi-variances and their spatial patterns were illustrated by Kriging approach. The spatial analysis showed that aggregate stability indices showed high consistency with variability of organic carbon in the studied region, indicating high contribution of organic carbon in formation of stable aggregates. In general, it was observed that due to the change of virgin forests into cultivated lands, soil quality has been diminished over the years. Key words Land Use, Soil organic carbon components, Clay-organic matter complex, Geostatics