Method for generating comprehensive evaluation map of heavy metal pollution of polder soil

Abstract

The invention relates to a method for generating a comprehensive evaluation map of heavy metal pollution of polder soil. The method comprises the following steps: acquiring a sampling site soil sample of a to-be-detected polder; performing data pretreatment on the numerical values of the contents of heavy metal elements in soil, thereby respectively obtaining a quasi-interpolation sub-sample of each heavy metal element; performing exploratory spatial data analysis treatment on the quasi-interpolation sub-samples, thereby obtaining the anisotropic parameters, a step length and a step number of the sampling site soil sample; performing function fitting on the numerical value of the contents of the heavy metal elements in the sampling site soil sample, thereby obtaining a theoretical semivariance function model suitable for interpolation of the contents of the heavy metal elements; drawing a spatial variation forecasting result distribution map by utilizing the sampling site comprising outlier; and comprehensively evaluating the heavy metal pollution of soil and generating the comprehensive evaluation map of heavy metal pollution of soil according to relative standard. Compared with the prior art, the method provided by the invention has the advantages that the advantages of the predication and evaluation of the heavy metal pollution of the polder soil, such as accuracy and precision, can be improved.

Description

technical field [0001] The invention relates to a technology related to environmental monitoring, in particular to a method for generating a comprehensive evaluation map of soil heavy metal pollution in reclamation land. Background technique [0002] The soil of the reclamation land in Shanghai is saline soil, which is formed by the salt-salted silt under the joint action of rivers transporting sediment and seawater, as well as ocean currents, tides, waves and other factors, and is distributed in strips along the coast and estuary along the river The lot belongs to coastal saline soil type in terms of distribution and formation. This type of soil is highly alkaline, heavy in texture, low in organic matter, and high in salt. Due to the particularity of beach development, its spatial distribution is mainly affected by sewage outfalls, reclamation, tidal flat locations, and soil clay content. Not only does it vary greatly in space, but it also changes rapidly in time. Tidal f...

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Problems solved by technology

[0004] After searching the existing technology, Liu Qing et al. published "Research on Spatial Distribution of Heavy Metals in Farmland Soil Based on GIS" in "Journal of Safety and Environment" (2007, 7(2): 109-113). The logarithmic transformation is used above. When the data conforms to the normal distribution and can satisfy the calculation of the variation function, the interpolation calculation is performed. The spatial characteristics of the soil sample observation data at the sampling point, especially the role of outliers, are not analyzed in detail, which is unique in the interpolation process. The influence of the value or outlier is more significant, and the accuracy of the prediction result will also be affected

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