Adapting proper agricultural management and conserving soil organic matter are importantcomponents of a sustainable agriculture. Soil organic matter content is a key attribute insoil quality. Plant residues are a potential source of soil organic matter thus, removal andburning of the residues will negatively influence the quality of soil and environment. Butsoil carbon sequestration improves soil quality and limits the proportion of CO2 emission ofagricultural land to the atmosphere. Labile organic matter pools can be considered as fineindicators of soil quality that are very sensitive to changes in soil management practices. Astudy was conducted to investigate the effects of different managements on carbohydratecontents and structural characteristics of two calcareous soils. This study was conducted in3 locations: 1- plots that receiving 0, 25, 50, 100 Mg/ha of manure for five yearssuccessively with a cropping rotation of wheat –corn every year; 2-plots under alfalfa, cornand rice of Lavark experimental farm and 3- inquiry research station of Fozveh at differentplots of alfalfa, wheat and fallow with a given cropping history recorded for the last 5years. Soil samples were taken from the center of each plot and the depths of 0-5 cm and 5-15 cm. In soil samples, organic carbon, hot water soluble carbohydrate, dilute acidhydrolysable carbohydrate, cold water soluble carbohydrate, particulate organic matter(POM), organic carbon and hot water soluble carbohydrate POM, total N, mean weightdiameter of water stable aggregates and aggregate size distribution were determined.Different managements consist of different levels of manure and types of cropping hadsignificant effects on the characteristics measured. The greateast amounts of carbohydrateand aggregate stability were obtained in the plots of 100 Mg/ha of manure in Lavak and inalfalfa plots in Fozveh station. The amounts of carbohydrate extracted from soil sampleswere varied in respecting order of hot water, dilute acid and cold water extractants. Also theresults showed that aggregate stability has a better correlation with hot water and dilute acidsoluble carbohydrate than organic carbon content of soil. Therefore, the carbohydrateextracted by hot water and dilute acid can be used as indexes of soil quality, particularly inrelation to soil aggregation.