Dynamics of aggregate-associated organic carbon after long-term cropland conversion in a karst region, southwest China.

ABSTRACT: Cropland conversion has a major impact on soil C sequestration. However, it remains unclear about the changes in soil aggregate and their contribution to C accumulation following cropland conversion in a karst region, southwest China. In this study, three different cropland use types (sugarcane, mulberry and forage grass cultivation) were selected to replace maize-soybean cultivation. The soil was collected at a depth of 0 to 30 cm for analysis of soil aggregates and their OC content. Results showed that macro-aggregate was the predominant component underlying four cropland use types. Forage grass cultivation remarkably increased the OC stock and aggregate stability (MWD and GMD). OC content and stock associated with aggregate varied with cropland use types and soil depth, but were typical

SUBMITTER: Wen L 

PROVIDER: S-EPMC9889731 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature