This paper introduces for the first time the equal intercept transformation radar chart—an improved form—to the assessment of soil environmental quality of Nanling commodity grain base. The equal intercept transformation radar chart, a visual graphical data analysis method, translates data from a numerical to graphical format. This visualization enables data presentation, analysis process and results stick out a mile and is capable of fully retaining information contained in data and excavating it in depth from geometry. Moreover, it overcomes pertinently the main defect of the conventional radar chart that the evaluation result depends heavily on the order of arrangement of indicators. The results indicated that the soil environmental quality at depths of 0–60 cm in the low mountain area of the Nanling commodity grain base was the second grade, while that in the hilly and plain areas were both first grade. The indicators of poor soil environmental quality in the low mountain area were exogenous Cd and endogenous As; those in the hilly area were exogenous Cd and endogenous As and Hg; and that in the plain area was exogenous Cd. The results were in line with the actual situation of the study area.
Background: Nan Ling commodity grain base is a national high-standard farmland demonstration area. Scientific evaluation of soil environmental quality is of important significance to plan land resources rationally to improve the quality and efficiency of agricultural production.Methods: This paper try to apply the equal intercept transformation radar chart --an improved radar chart--to the assessment of soil environmental quality. In the assessment, the area of equal intercept transformation radar chart is adopted to represents the soil environmental quality.Different from the other assessment methods in common use, the equal intercept transformation radar chart method, as a visual graphic data analysis method, transforms data into graphics and therefore the data information can be retained and excavated more fully. Moreover, this advanced radar chart overcomes targetedly the main defect of the conventional radar chart that the evaluation result depends heavily on the order of arrangement of indicators.Results: The results indicate that the soil environmental quality at depth of 0-60cm in low mountain area of Nan ling commodity grain base is the second grade while that in the hilly and plain area are both the first grade. The indicators of poor soil environmental quality in low mountain area are exogenous Cd and endogenous As, those in hilly area are exogenous Cd and endogenous As and Hg, and that in plain area is exogenous Cd.Conclusion: It is proved through this special case study that the application of equal intercept transformation radar chart to the assessment of soil environmental quality is feasible and more intuitive, comprehensive and fine.
Nan Ling commodity grain base is a national high-standard farmland demonstration area. Scientific evaluation of soil environmental quality is of important significance to plan land resources rationally to improve the quality and efficiency of agricultural production. This paper try to apply the Radar Chart-a visual graphic data analysis method-to the assessment of soil environmental quality. In the assessment, a new idea was introduced that area and perimeter of radar chart represents the soil environmental quality and the difference between the qualities of the soil environmental quality indicators respectively. Different from the other assessment methods,the Radar Chart method transforms data into graphics and through an intensive analysis
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