Abstract
A total of 94 soil samples from different soil depths (0∼25 cm, 25∼50 cm) were collected of farmland soil around the plain of Beijing, and the concentrations of five heavy metal elements (Cd, Cr, Pb, As, and Hg) were measured using standard methods. The safety utilization evaluation method of heavy metals was based on three different evaluation methods. Then, the governance principles and specific management control strategy were determined in detail according to the core pollution source analysis of each safety grade zone. The results show that there are four different comprehensive safe utilization areas: safe, low-risk, medium-risk, and high-risk utilization. Among them, the study area was dominated by low-risk utilization areas, and the risk trend was gradually weakening from the center of the city to the periphery. Based on the characteristics of different security zones, this study puts on the governance principles of priority protection, long-term monitoring and moderate optimization, strengthens early warning, and cooperates with effective repair and priority governance. And then it puts forward practical control strategies according to the core pollution sources of each safety utilization zone. Our findings may provide a clear direction for rational utilization of land resources and renovation in the future.
Highlights
Soil is an organic part of the ecological environment, a natural environment on which mankind depends and a natural resource for agricultural production
The basic descriptive statistics of the heavy metal concentrations analyzed in soil samples around the plain of Beijing were listed in Table 2 and Figure 2
According to the characteristics of different security zones, combined with the source apportionment results of soil heavy metal pollution in the study area, we proposed the rationalization proposals for the land of zoning utilization and management based on the principles of safety utilization, targeted governance and adjust measures to local conditions
Summary
Soil is an organic part of the ecological environment, a natural environment on which mankind depends and a natural resource for agricultural production. Based on the monitored data, basic physicochemical properties of the soil, and related environmental factors, this essay took farmland soil around the plain of Beijing as the research object; analyzed the horizontal and vertical distribution characteristics of heavy metals (Cd, Cr, Pb, As, and Hg) in the soil of the study area; and used the geoaccumulation index, the improved geoaccumulation comprehensive index, and the potential ecological risk index and carried out the assessment of soil heavy metals. It puts forward a scheme for the regional division of the security of soil heavy metals. The research findings of this essay will provide scientific reference for the control of pollution risk of soil heavy metals and contribute to the efficient and safe utilization of soil
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