Effect of Continuous Cropping on Chemical Properties and Enzyme Activity in Rhizosphere Soil of Chrysanthemum morifolium
[Objective]The research focused on the effects of continuous cropping on Chrysanthemum morifolium biomass accumulation,rhizosphere soil chemical properties,nutrient content,and enzyme activity.[Method]C.morifolium plants and their rhizosphere soils under three treatments were studied:no continuous cropping(CK),2-years continuous cropping(CM2),and 9-years continuous cropping(CM9).C.morifolium biomass accumulation,rhizosphere soil chemical properties,and enzyme activity were measured.[Results]After 9 years of continuous cropping,aboveground and belowground biomass accumulation of C.morifolium decreased by 47%and 44%,compared to the control.Organic matter,available nitrogen,available phosphorus,and available potassium content in the rhizosphere soil increased by 64%,74%,348%,and 67%,respectively,compared to the control.With increasing years of continuous cropping,protease activity gradually increased.While cellulase,urease,and nitrate reductase activities decreased.Nitrite reductase,phosphatase,and catalase activities initially decreased and then increased.The relative analysis showed that soil chemical properties such as pH,organic matter,available nitrogen,available phosphorus,and available potassium resulted in changes of soil activities.[Conclusion]The study demonstrated that continuous cropping led to reduced C.morifolium biomass accumulation,imbalanced soil nutrient content,and disrupted enzyme activity in the rhizosphere soil.These results provide insights into the causes and effective prevention of continuous cropping in C.morifolium cultivation.
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