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Method for restoring desertificated lands by aid of charcoal

A biochar and land technology, applied in the field of land desertification prevention and control, can solve problems such as threats to the ecological security of groundwater, unsatisfactory restoration mode, leakage loss of irrigation water, etc. Effect

Inactive Publication Date: 2014-09-10
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, planting trees and grass to improve soil fertility requires a long cycle, and often requires a large amount of watering, fertilization and spraying of pesticides. Due to the extremely low water and fertilizer retention capacity of desertified land, the adsorption is very poor, resulting in serious leakage of irrigation water. , cannot be effectively utilized, and at the same time, elements such as nitrogen, phosphorus, potassium and residual pesticides in the fertilizer cannot be effectively absorbed by the soil layer and migrate downward with the water, seriously threatening the ecological security of groundwater, and polluting the surrounding surface water through surface runoff
[0004] In the long run, only relying on planting trees and grasses to restore desertified land can restore vegetation in a short period of time, but the economic cost is high and there are potential ecological risks, especially in areas where water resources are scarce and energy is scarce. Repair mode is not ideal

Method used

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  • Method for restoring desertificated lands by aid of charcoal
  • Method for restoring desertificated lands by aid of charcoal
  • Method for restoring desertificated lands by aid of charcoal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 The method of using biochar to remediate desertified land—pot test

[0034] In the method for repairing desertified land provided in this example, the biochar is prepared by pyrolysis of corn stalks under the condition of anoxic and high temperature of 400-500°C. The prepared biochar is passed through a 2mm sieve, and the ~4% by weight is added to sandy soil and mixed evenly, watered and aged for one month, planted commonly used lawn grass clover, keeping 15%~25% soil water content, harvested after 5 months of clover growth, and measured clover biological At the same time, 0%, 1%, and 2% corn straw biochar were added to the sandy soil without planting plants, and the soil bulk density, field water holding capacity and soil porosity were measured; the effective nutrient content of the sandy soil was measured.

[0035] The measuring method of the present invention is to measure soil bulk density, field water holding capacity and soil porosity by ring knife me...

Embodiment 2

[0046] Example 2 The method of using biochar to remediate desertified land——Field test

[0047] The test site in this example is located in Kangzhuang Town, Yanqing County, Beijing, N27°50′1.3″, E113°02′8.4″, which belongs to the windy and sandy area in the north of Beijing, characterized by drought and windy conditions, severe desertification, water shortage, and sparse vegetation. Yanqing belongs to the continental monsoon climate, which belongs to the transition zone between temperate zone and middle temperate zone, semi-arid zone and sub-humid zone. The climate is cold in winter and cool in summer, with an average annual temperature of 8 degrees Celsius. The particle size distribution of the soil is shown in Table 4. Biochar is prepared by pyrolysis of corn stalks under the condition of anoxic and high temperature of 400-500°C, and the prepared biochar is passed through a 2mm sieve. The test set four treatments of adding biochar and not adding biochar to bare land and al...

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Abstract

The invention provides a method for restoring desertificated lands by the aid of charcoal. The method includes adding the charcoal with the particle size smaller than or equal to 2mm into desertificated soil according to the weight percentage ranging from 1% to 2%; planting leguminous plants in the desertificated soil. The method has the advantages that physical and chemical properties of the desertificated soil can be quickly improved by the charcoal, organic carbon and nitrogen contents of the soil can be increased, the water and fertilizer retention capacity of the soil can be improved, and nitrogen contents of the leguminous plants can be increased; the method is combined with an effect of returning the leguminous plants to fields, so that input of water and fertilizers can be saved, and vegetation can be quickly and effectively restored.

Description

technical field [0001] The invention relates to the technical field of land desertification prevention and control, in particular to a method for repairing desertified land by utilizing biochar, which saves water and fertilizer and quickly restores desertified land vegetation. Background technique [0002] Land desertification refers to the process of natural desert expansion and vegetation destruction on sandy soil and bare sandy soil due to climate change and human activities. Land desertification has always been one of the major ecological problems faced by northern China (for example, Beijing). The "Fourth Monitoring Report on Desertification and Sandy Land in Beijing" released in 2009 shows that: the desertified land in Beijing is mainly distributed along the Yongding River, Chaobai River, Wenyu River, Kangzhuang area, Nankou area, Huairou, Miyun Dasha River area and Fangshan Juma River and the sandstorm area in front of the mountain. Since the 40th, 50th, and 60th an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02
Inventor 郑瑞伦庞卓谢祖彬孙国新武菊英王庆海肖波李翠
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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