As the saying goes, ten different sounds, the soil is “10 meters different qualityâ€, its high degree of incompatibility, determines the soil examination, is a technical work, the set point needs to include the basic points, specific points and background points Three major categories.
Among them, the basic points are mainly for arable land and forest land, which are census points; specific points are mainly for drinking water sources and contaminated sites, which are characteristic points for reflecting soil conditions and changes in key areas; background point distribution Areas that are not disturbed by human activities or that are less affected by human activities are comparative points that reflect changes in soil quality over a long period of time.
How to operate? "Using the grid method." The relevant person in charge of the monitoring office of the Municipal Environmental Protection Bureau said that the soil is a few points. Samples are taken in this grid. A monitoring point can represent the extent of soil conditions, and the density of the grid is divided. Degree related.
According to reports, in Nanjing, a monitoring site represents approximately 1 mu of land, and multiple soil samples will be collected with a total weight of approximately 1 kg. The collected samples will be packed in plastic bags, dried, ground, sifted, packaged, etc., before finally forming a “health check†sample.
According to the requirements of the Ministry of Environmental Protection, after determining the soil national control points, 20% of them will be selected each year to carry out routine monitoring of soil environmental quality and complete a monitoring cycle in 5 years. According to monitoring data, environmental protection agencies around the world need to prepare reports on soil environmental quality monitoring and evaluation.
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