Method for treating calcium farmland with heavy metal copper and lead combined contamination by utilizing elms

Abstract

The invention relates to a method for treating a calcium farmland with heavy metal copper and lead combined contamination by utilizing elms. The method comprises the following steps: firstly, performing sealing treatment on the calcium farmland with heavy metal copper and lead combined contamination; then, planting elm seedlings on contaminated soil according to a row spacing of 1.5*2m, and performing daily management according to the conventional method so as to construct an elm plantation treatment system; and finally, replacing the elm plantation according to the commercial forest aim. The method disclosed by the invention can bring economic benefits and has important ecological and environmental functions, so the method contributes to treating the calcium farmland with the heavy metal copper and lead combined contamination.

Description

technical field [0001] The invention relates to a risk control-based treatment method for complex heavy metal polluted farmland, in particular to a method for treating heavy metal copper and lead compound polluted calcareous farmland by using elm trees. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" (2014), the total excess rate of soil in my country is 16.1%, and the pollution type is mainly inorganic, mainly including 8 heavy metals / metalloid elements, copper (Cu) and lead (Pb) is one of the two elements with a relatively high exceeding rate, and its point exceeding rate is 2.1% and 1.5% respectively. As far as cultivated land is concerned, 19.4% of its points exceed the standard, and the pollution is mainly from inorganic models. Judging from the reality of soil pollution, most types of pollution are compound pollution, among which compound pollution of multiple heavy metal elements is the most common pollution situation. Compare...

AI Technical Summary

Problems solved by technology

Based on the climate characteristics of drought and low rainfall in the calcareous soil area and the aggravation of land salinization, desertification, and desertification, once the limited arable land in the calcareous soil area is polluted by heavy metals, it will bring extremely serious consequences.

First, continuing to cultivate the contaminated land will produce food products that pose potential human health risks

Secondly, in order to seek cleaner land, large areas of forests will be cut down, which will not only destroy th

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