基于扬州市1984—2020年表层土壤数据，运用地统计分析和相关性分析方法，系统分析了扬州市耕地土壤有效锌含量时空变化特征及其影响因素。结果表明：近37年扬州市耕地土壤有效锌平均含量上升1.15 mg/kg，增幅达188.5%；扬州市耕地土壤有效锌分布存在明显的空间异质性，总体上呈现南高北低、西高东低的分布特征。成土母质、土壤质地及土地利用方式不同，耕地土壤有效锌含量存在显著差异。不同成土母质中，长江冲积物发育土壤有效锌含量较高；不同土壤质地中，砂壤土中有效锌含量较高；不同土地利用方式中，旱地土壤中有效锌含量最高。土壤pH及有机质含量与土壤有效锌含量存在不同程度的响应关系。

Based on the data of topsoil available Zn contents of croplands in 1984-2020 in Yangzhou City, geostatistical analysis and correlation analysis were applied to systematically analyze spatio-temporal variation characteristics of available Zn and its influencing factors. The results showed that available Zn increased meanly by 1.15 mg/kg and by 188.5% in the past 37 years. Available Zn was spatially heterogeneous, which was high in south and west, but low in north and east. Available Zn was significantly different between different parent materials, soil textures and soil utilizations, among of which, the Yangtze River alluvial deposit had the higher available Zn than other parent materials, sandy loam soil had higher available Zn than other textures, dry field had higher available Zn than other land use types. Additionally, soil available Zn had certain relationship with soil pH and organic matter.

S158

国家重点研发计划项目（2016YFD0200300）资助。