What measures have been taken to control soil desertification in northwest China?

Various metrics are nothing more than: 1. Forest and grass measures II. Engineering measures 1. Forest and grass measures have a slow effect and a long period, but they can cure the problem. 2. Characteristics of engineering measures Engineering measures are quick to take effect, shorter in cycle than forestry and grass measures, quick to take effect and outstanding in effect. But it can only solve the urgent need. In the process of management, the combination of forest and grass measures and engineering measures can undoubtedly achieve the best results. For the prevention and control of desertification in China, measures should be formulated according to the causes of desertification. 1. Desertification caused by wind erosion. Generally, it is necessary to set up mechanical sand barriers or fix sand by chemical methods. (1) Mechanical sand barrier is to use firewood, branches, soil, branches and other materials to set obstacles on the sand surface to control the direction, speed and structure of sand flow, so as to achieve the purpose of preventing wind, fixing sand and changing landform. (2) Chemical method is to spray cementing chemicals on the loose quicksand surface, so that water can quickly penetrate below the sand layer, so that the sand surface has a protective shell, avoiding the loose structure of airflow and loose sand surface, and playing the role of wind erosion. Like mechanical sand barrier, it is a palliative measure and an auxiliary, excessive and supplementary measure for plant sand control. (3) Wind-induced sand control is a method based on wind power to control wind erosion and sand transport and turn harm into benefit. (4) Hydraulic sand control. With water as power, sand can be transported as needed to eliminate sand damage. The essence is to use hydraulic directional control of erosion and handling, so as to achieve the purpose of promoting benefits and eliminating pests. 2. Desertification caused by hydraulic erosion. Ready-made soil and water conservation engineering measures (slope, ditch, drainage and water storage) 3. Desertification caused by salinization. Water conservancy engineering measures can be used. (1) Drainage engineering (2) Irrigation and saline-alkali land improvement (3) Irrigation and salt spraying can also be used in agricultural bioengineering. Rice planting improvement, paddy-upland rotation, fertilization and salt suppression, land leveling and deep ridging 4. Desertification caused by road mining engineering. (1) correct site selection (2) engineering: sand barrier, foundation protection, slope protection (3) biology: windbreak forest, rational structure of arbor irrigation, windbreak and sand fixation, active sand barrier (4) chemistry. Finally, if it is really not feasible, close the mountain to facilitate afforestation. However, the status quo may not meet the requirements of the above measures. Environmental protection workers are hard-working and low-paid, and people don't pay attention to it.

1: remediation measures in non-desert areas: in chronological order: returning grazing to grassland-returning farmland to forests-Beijing-Tianjin-Hebei sand control project-ecological migration. Everyone knows that this is government-led and the policies are consistent. 2. Restoration measures in desert areas: International friends: Japanese. Whether it is Toyama Seiko in Kubuqi Desert or Japanese sprinklers in non-desert areas. It has indeed made great contributions to improving the ecological environment. Local government: In the 1990s when the Yellow Sand was raging, the local government began to realize the environmental problems and began to plant trees on a large scale. On Arbor Day in primary and secondary schools, the school organizes to bring dry food and plant trees. The school has never been organized since high school, because the ecology has been controlled. NGOs: private enterprises and voluntary non-profit organizations. Let me talk about the contribution of a private enterprise that I know better to Kubuqi Desert and desertification. Desertification caused by wind erosion. Generally, it is necessary to set up mechanical sand barriers or fix sand by chemical methods. (1) Mechanical sand barrier is to use firewood, branches, soil, branches and other materials to set obstacles on the sand surface to control the direction, speed and structure of sand flow, so as to achieve the purpose of preventing wind, fixing sand and changing landform. (2) Chemical method is to spray cementing chemicals on the loose quicksand surface, so that water can quickly penetrate below the sand layer, so that the sand surface has a protective shell, avoiding the loose structure of airflow and loose sand surface, and playing the role of wind erosion. Like mechanical sand barrier, it is a palliative measure and an auxiliary, excessive and supplementary measure for plant sand control. (3) Wind-induced sand control is a method based on wind power to control wind erosion and sand transport and turn harm into benefit. (4) Hydraulic sand control. With water as power, sand can be transported as needed to eliminate sand damage. The essence is to use hydraulic directional control of erosion and handling, so as to achieve the purpose of promoting benefits and eliminating pests. 2. Desertification caused by hydraulic erosion. Ready-made soil and water conservation engineering measures (slope, ditch, drainage and water storage) 3. Desertification caused by salinization. Water conservancy engineering measures can be used. (1) Drainage engineering (2) Irrigation and saline-alkali land improvement (3) Irrigation and salt spraying can also be used in agricultural bioengineering. Rice planting improvement, paddy-upland rotation, fertilization and salt suppression, land leveling and deep ridging 4. Desertification caused by road mining engineering. (1) correct site selection (2) engineering: sand barrier, foundation protection, slope protection (3) biological windbreak forest, rational structure of arbor and shrub, windbreak and sand fixation, active sand barrier (4) chemistry.