Effects of Vermicompost Application on Organic Carbon Pool and Its Stability in Coastal Saline-alkaline Soil
To investigate the effects of vermicompost application on organic carbon pool and its stability in coastal saline-alkaline soil,a field experiment was conducted in such soil under barley-maize rotation in Fangling Reclamation Area,Bencha Town of Rudong County,Jiangsu Province,and the vermicompost was one-time applied to the field with the rates of 0,25,50,100,200 t/hm2 in October 2019,soil samples were collected in October 2022 from the topsoil layer(0-20 cm)to determine the contents of dissolved organic carbon,calcium associated organic carbon,labile organic carbon,particulate organic carbon and mineral-associated organic carbon.The carbon pool management index was calculated,and the functional group structure of soil organic carbon was analyzed by solid-state nuclear magnetic resonance spectroscopy.The results showed that compared with no application of vermicompost,soil organic carbon pool changed significantly after application of more than 50 t/hm2 vermicompost,soil organic carbon content increased by 35％-97％,dissolved organic carbon content increased by 27％-104％,calcium associated organic carbon content increased by 19％-26％,and labile organic carbon content increased by 6％-94％,prticulate organic carbon and mineral-associated organic carbon increased by 14％-124％and 37％-85％respectively,and soil carbon pool management index increased by 6％-92％;The ratio of Aliphatic C to Aromatic C decreased,and the values of Alkyl C/O-alkyl C and Hydrophobic C/Hydrophilic C all increased,indicating the improvement in the structural stability of soil organic carbon.In conclusion,the application of vermicompost has a significant effect on the improvement of soil organic carbon pool and its stability in coastal saline-alkaline soil,and the effect is the best under the application amount of 50 and 100 t/hm2.
VermicompostCoastal saline-alkaline soilSoil organic carbon poolCarbon pool management indexSolid-state NMR
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