Study On Distribution Of Carbon And Nitrogen Of Soil Aggregates Among Reclaimed Soil Of Shendong Coal-mining Subsidence

Distribution of Carbon and Nitrogen of Soil Aggregates among Reclaimed Soil of Coal-mining Subsidence were studied under different Reclamation method,which provide a theoretical basis for the selection of suitable vegetation and enhancement of soil fertility.Contents and stability of soil aggregates and distribution of carbon and nitrogen were studied under different Reclamation method in Shenfudongsheng coal mining subsidence reclamation soil.Treaments are control,Xanthoceras sorbifolia Bunge,Cerasus humilis(Bge.)Sok and Amygdalus pedunculata Pall reclamation method.The main research results were as follows:1.Content of soil mechanical-stable aggregates(>0.25mm)was most.Content of big aggregates was decreased in water-stable aggregates.Content of big aggregates in sorbifolia vegetation reclamation land was significantly higher than that of control in 0-20cm top soil.Stability of soil aggregates in sorbifolia vegetation reclamation land was best in 0-20cm topsoil.while Amygdalus pedunculata vegetation reclamation land was best in 20-40cm subsoil.2.The contents of soil organic carbon and nitrogen in topsoil were higher than that in the subsoil soil,except Cerasus humilis(Bge.)Sok vegetation reclamation land.the content of soil organic carbon and nitrogen in<0.05mm agglomerates was the highest.Reclamation had a significant effect on the formation of water stable aggregates and increased the content of organic carbon and nitrogen in topsoil.After the reclamation,the C/N ratio became smaller,among which Xanthoceras sorbifolia was the best.3.The proportion of organic carbon(s+c_mM)in the agglomerates and organic matter in the organic carbon pool was significantly changed in Cerasus humlis(Bge.)Sok vegetation reclamation land and the effect was significant compared with other reclamation models.The increase of granular organic carbon(iPOM_mM)in the agglomerate in sorbifolia vegetation reclamation land was superior to other models in the subsoil.Combined with the local growing conditions and vegetation growing,sorbifolia and Cerasus humilis(Bge.)Sok can be drawn as the preferred vegetation reclamation of coal mining subsidence,worth promote the use in Shenfudongsheng coal mining subsidence.