轮作方式对连作茭白土壤理化性质的影响OA

To explore the remediation effects of rotation systems on the degraded soil in the cultivated layer of Zizania latifolia,3 rotation systems of Zizania latifolia-maize,Zizania latifolia-rice,and Zizania latifolia-taro were set up.The aim was to study the impacts of these 3 rotation systems on soil structure,soil nutrients,and other physical and chemical properties of the cultivated layer after long-term planting of Zizania latifolia.The results showed that compared with continuous Zizania latifolia cultivation,the rotation systems of Zizania latifolia-maize and Zizania latifolia-taro could remarkably increase(P<0.05)the soil porosity and raise the proportion of water-stable aggregates(≥2 mm)in the soil.Under the 2 rotation systems,the proportion of water-stable macropores(≥2 mm)increased by 7.68%and 9.00%respectively,and the effective soil pores increased by 28.23%and 21.19%respectively.The rotation systems of Zizania latifolia-maize and Zizania latifolia-taro could significantly increase the soil pH value(P<0.05).After the rotation,the soil pH value increased to a range of 5.79-5.82.The rotation systems of Zizania latifolia-rice,Zizania latifolia-maize,and Zizania latifolia-taro could significantly reduce the contents of soil organic matter,available nitrogen,available phosphorus,and available potassium(P<0.05).All these indicators were maintained within a relatively reasonable range,thus reducing the risk of environmental pollution.In terms of economic benefits,among the three rotation systems,the Zizania latifolia-corn rotation showed the best total benefit,reaching 17 786.5 yuan/667 m².In conclusion,the three rotation systems in this study can improve the physical and chemical properties of degraded soil.In terms of economic benefits,the rotation system of Zizania latifolia-maize performs the best.