<![CDATA[Organic matter is one of soil bonding agent in formation and stabilization of soil aggregates or soil structure. Since it affects several other soil peorperties, soil structure is considered as a determinant for soil quality. Therefore, depletion of organic matter content in a soil will cause soil degradation and consequently environmental pollution. This research was aimed to determine org-C status of Ultisols Limau Manis and the relationship to aggregate stability, as affected by land use change. The results showed that soil organic-C decreased by approximately 42% (from 9.86% to 5.75%) and by 55% (from 9.86% to 4.42%) at 0-10 cm depth and by 45% (from 3.79% to 2.09%) and 18% (from 3.79% to 3.10%) at 10-20 cm depth as land use was changed from forested ecosystem to perennial and annual crops, respectively, in Ultisols Limau Manis Padang. There was a tendency of positive correlation between soil org-C status and the aggregate stability, or negative correlation between org–C status and the dispersion ratio (DR). Between both depths, 10-20 cm depth showed a stronger correlation than that of 0-10 cm depth.Key words: org-C, land use change, dispersion ratio, aggregate stability]]>
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