植被恢复模式对土壤团聚体和有机碳储量的影响.

Vegetation restoration is an important part of karst rocky desertification management for sustainable environmental development. The soils under three typical restoration models (grassland, forest-grassland, forest-shrub-grassland) in the karst plateau mountain rocky desertification area were selected as the research objects to investigate the effect of restoration modes on soil aggregate stability and soil organic carbon stocks. Additionally, the characteristics of soil aggregate stability and organic carbon stock distribution in 0-10 and 10-20 cm soil layers under different years and treatments were studied by dry and wet sieving, respectively. The results showed that mean weight diameter(Dmw) and geometrical mean diameter(Dgm) values were higher in forest-shrub-grassland than in grassland and forest-grassland in the bilayer soil. Compared with the results in 2018, the soil organic carbon stocks of all plots in 2019 increased, and compared with that of the grassland and forest-grassland, the soil organic carbon stocks in the forest-shrub grassland model showed a significant increase（P＜0.05） of 52.52% and 37.08% in the 0-10 and 10-20 cm soil layers, respectively, compared with the grassland. Compared with the wet sieving results, dry sieving could better avoid the loss of water-soluble carbon and was the preferred method for characterizing the stability of mountain soil aggregates in the karst plateau. Therefore, the vegetation restoration model of mixed planting can improve the stability of soil aggregates and promote the sequestration of organic carbon, effectively maintain the soil quality of ecological restoration in karst areas, and has great potential for improving soil nutrient storage. [ABSTRACT FROM AUTHOR]