Effects of Different Rotation Modes of Sweet Potato on Soil Organic Carbon Components and Carbon Conversion Enzyme Activities
In order to investigate the effects of different rotation modes of sweet potato on soil organic carbon components and carbon invertase activity,we took sweet potato-wheat continuous cropping land for 3 years as the research object,set up four treatments including sweet potato-wheat continuous cropping(SWS),sweet potato-wheat/sweet potato-rapeseed rotation(SWR),sweet potato-wheat/corn-wheat rotation(SWC),and sweet potato-wheat/peanut-wheat rotation(SWP),studied the effects of different rotation modes on soil organic carbon components and carbon invertase activity in 0-20 cm and 20-40 cm soil layers,and explored their correlations.The main results were as follows:compared with the SWS treatment,the SWR,SWC,and SWP treatments could increase soil organic carbon(SOC),dissolved organic carbon(DOC),particulate organic carbon(POC),readily oxidizable organic carbon(ROC),microbial biomass carbon(MBC)content,and soil sucrase,cellulase,polyphenol oxidase,and peroxidase activity in 0-20 cm and 20-40 cm soil layers.Overall,POC,DOC,ROC and MBC ratios in 0-20 cm and 20-40 cm soil layers were increased.There were also significant differences in soil organic carbon and its component content,as well as carbon conversion enzyme activity among different rotation treatments.In 0-20 cm soil layer,the ROC content and sucrase activity of the SWC treatment were significantly increased by 5.79%,7.56%,and 7.20%,8.71%compared to the SWR and SWP treatments,respectively.The DOC content of the SWR treatment was significantly increased by 5.67%compared to the SWP treatment.The MBC content and peroxidase activity of the SWP treatment were significantly increased by 5.93%,10.35%,and 11.89%,7.02%compared to the SWR and SWC treatments,respectively.In 20-40 cm soil layer,the POC,ROC content and sucrase activity of the SWC treatment were significantly increased by 5.07%,5.42%,and 9.48%compared to the SWP treatment,and the activities of polyphenol oxidase and peroxidase of the SWC treatment were significantly increased by 5.93%and 7.14%compared to the SWR treatment,respectively.The DOC content and sucrase activity of the SWR treatment were significantly increased by 5.93%and 5.65%compared to the SWP treatment,respectively.The MBC content of the SWP treatment was significantly increased by 7.56%compared to the SWC treatment,and the activities of polyphenol oxidase and peroxidase of the SWP treatment were significantly increased by 5.56%and 12.30%compared to the SWR treatment,respectively.The result of correlation analysis showed that there was a direct or indirect relationship between the soil organic carbon and its components and carbon conversion enzyme activity under different rotation modes of sweet potato.In summary,the different rotation patterns of sweet potato could increase the content of soil organic carbon and its components,as well as the activity of carbon conversion enzymes.Among them,the SWC(sweet potato-wheat/corn-wheat rotation)and SWP(sweet potato-wheat/peaunt-wheat rotation)treatments performed significantly better than the SWR(sweet potato-wheat/sweet potato-rapeseed rotation)treatment.
万方数据
维普
