[Objective]This study aimed to explore the potential damage of non-grain conversion of cultivated land on soil health,and provide a scientific basis for evaluating the impact of non-grain conversion on land productivity and ecological functions.[Methods]80 surface soil samples were randomly collected from six types of non-grain conversion land,including facility vegetable field,orchard,poplar forest,grassland,highway landscape forest,and fallow land,and the control farmland in the rural-urban fringe area of Xuzhou City through field survey,sampling analysis,model evaluation,and statistical analysis.A total of 23 indicators of soil physical,chemical,and bi-ological properties,as well as heavy metal pollution were measured to construct the cultivated land health assessment model,to explore the impact of non-grain conversion on land productivity and soil health.[Results]The results show that:(1)Non-grain conversion significantly changed soil physio-chemical and biological characteristics.The activities of cellulose disaccharide hydrolase,alkaline phosphatase,and bacterial diversity index in non-grain conversion soil were significantly lower than those in the soil of the control site(P＜0.05).The soil organic matter content(27.92-36.33 g·kg-1),total phosphorus(0.89-1.54 g·kg-1),available phosphorus(186.82-307.01 mg·kg-1),available potassium(199.09-305.03 mg·kg-1),and total nitrogen and nitrate nitrogen content in fa-cility vegetable plots were the highest,and there were significant differences(P＜0.05)compared to the other five non-grain conversion land use types;(2)Compared to the farmland control site,the six types of non-grain conversion land use have led to some imbalance of different soil func-tions including productivity,water retention and purification,carbon sequestration,nutrient cy-cling,and biodiversity,even resulting in a suboptimal health state;(3)The structural equation mod-el fitting result shows that soil nutrients,enzyme activity,biodiversity,and heavy metal pollution in-dex dominated the soil health differentiation of non-grain conversion sites.[Conclusion]Non-grain conversion had an impact on cultivated land health,while there were considerable differences in health damage among different land uses.The results provide some reference for targeted man-agement of non-grain conversion of farmland and safeguarding food security.
non-grain conversionsoil healthsoil functionheavy metal pollutioncultivated land protection
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