The characteristics and influencing factors of element combination in cultivated surface soil of the Shijiaqiao area, northern Zhejiang Province

Based on the data gathered from quality survey of the cultivated land in the Shijiaqiao area, northern Zhejiang Province, we sampled and analyzed the cultivated surface soil of the research area at a higher density, and obtained 19 indexes of soil elements. The study adopted SPSS to process the test results with cluster analysis and factor analysis, in combination with the regional geological background and the chemistry of indexes combinations, and concluded the combination characteristics and influencing factors of elements in cultivated topsoil. The results show that the surface soil was generally acidic and the content of elements was close to the background value of that in WuXing District. The elements content in the surface soil were mainly influenced by parent material, followed by the process of organic humus, rock weathering, water distribution, and human production activities. The content of N and K was medium to rich in general, while the content of P was mainly deficient to medium, and Mn was relatively deficient. It is suggested to fertilize reasonably according to farming needs, and pay more attention to control pollution sources in local heavy metal anomaly areas.