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Acidated forestry soil repairing method

A technology for forest soil and restoration methods, applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc., can solve problems such as obvious side effects, aggravate nutrient imbalance, pollution, etc., and achieve the effect of avoiding soil nutrient imbalance

Inactive Publication Date: 2007-03-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it is appropriate to add limestone (or magnesite, dolomite) or some soluble salts (such as MgSO 4 ) is considered to be an effective method to prevent soil acidification and increase soil nutrients at the same time, so as to obtain a certain degree of utilization, but preliminary studies have shown that its side effects cannot be ignored, including the increase of soil nitrogen mineralization rate and nitrification rate (thereby leading to the increase of organic matter content drop), NO 3 - and SO 4 2- The leaching of other anions (may cause groundwater pollution), soil Mg 2+ and K + The leaching of other cations (exacerbating nutritional imbalance) and Al 3+ Activation of toxic heavy metal ions (may cause harm to vegetation and aquatic organisms), etc.
In order to reduce costs, some studies have also tried to use cheap solid waste, such as municipal waste, residual sludge from sewage treatment plants, and flue gas desulfurization products from power plants, but the side effects are more obvious

Method used

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  • Acidated forestry soil repairing method
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Examples

Experimental program
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Effect test

example 1

[0024] Example 1: On-site observation of restoration agent effect

[0025] This example concerns the effectiveness of the invention after use in southern forests that are heavily affected by acid deposition.

[0026] In order to verify the remediation effect of alkaline remediation agents on acidified forest soil, typical acidified forest soils with serious acid deposition hazards and little impact from human activities were selected to establish observation stations for long-term observation. The observation station is located in Chongqing Tieshanping Forest Farm, located in the northeast of Chongqing, about 25km from the city center, about 450m above sea level, with an average annual temperature of about 18°C ​​and an average annual precipitation of about 1100mm. The vegetation is Pinus massoniana forest (about 40 years old) ), the soil is mountainous yellow soil, the soil-forming parent material is sand shale, and the current sulfur deposition is 10-12g m -2 ·a -1 , the a...

example 2

[0032] Example 2: Mathematical Simulation of Restorative Effects

[0033] The field observation method is used to test the remediation effect of remediation agents on acidified forest soil. Although the reliability is high, there are disadvantages such as high cost, long time consumption, and the inability to control the experimental conditions at will. Therefore, on the basis of field observation results, it is also necessary to use mathematical models to simulate the effect of adding restoration agents, and to determine the optimal formula of composite restoration agents.

[0034] The model used in the simulation is the MAGIC model, which is called the "Model of Acidification of Groundwater in Catchment". The model considers various biogeochemical processes such as atmospheric deposition, mineral weathering, biological absorption, soil leaching, anion adsorption, cation exchange, aluminum dissolution and precipitation, nitrogen nitrification and mineralization, and solution ...

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Abstract

The present invention relates to a method fro chemically-repairing acidified forest soil, belonging to the field of environment pollution control technology. It is characterized by that said invention uses limestone and siderite / dotomite as raw material, and spreads them according to the mole ratio of 3:2 of Ca and Mg over the forest soil surface so as to repair the acidified forest soil and forest ecological system.

Description

technical field [0001] The invention relates to a soil pollution treatment method, in particular to a chemical repair method for acidified forest soil caused by acid deposition or afforestation, and belongs to the technical field of environmental pollution prevention and control. Background technique [0002] Soil acidification is one of the main forms of soil degradation. With the rapid development of the economy, my country's emissions of sulfur dioxide and nitrogen oxides and other acid-causing substances have surpassed those of Europe and the United States, ranking first in the world. After Europe and North America, my country also has a large area of ​​acid rain distribution. Studies have shown that the forest area affected by acid rain in the seven southern provinces of my country is 128.21×10 4 hm 2 , due to the decline in forest growth, the annual economic loss caused by the decline in timber production has reached 600 million yuan; at the same time, considering t...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/02
Inventor 段雷杨永森
Owner TSINGHUA UNIV