Give full play to the deterrent effect of the ecological barrier and other mountain systems in the main stream of the Yellow River, and implement the project of locking the frontier defense wind and f

Give full play to the deterrent effect of the ecological barrier and other mountain systems in the main stream of the Yellow River, and implement the project of locking the frontier defense wind and fixing sand. Give full play to the ecological barrier of the main stream of the Yellow River and the barrier function of Qilian Mountain, Liupan Mountain, Helan Mountain and Yinshan Mountain, and implement the project of locking the frontier defense wind and fixing sand.

1, windbreak and sand fixation

We will implement the project of locking the frontier defense wind and fixing sand, strengthen the construction of ecological barriers in the marginal areas of major sand, and vigorously control the mobile sand dunes. Promote the comprehensive control of water erosion, wind erosion and soil erosion in the ecotone between agriculture and animal husbandry in the upper reaches of the Loess Plateau. Actively develop advanced technologies and industries for sand control and expand international exchanges and cooperation in sand control. Carry out large-scale sand prevention and control, innovate desert management mode, and build a sand prevention belt in the north.

2. Desert shelterbelt

We will continue to promote the construction of desert shelter forest system, carry out in-depth major projects such as returning farmland to forests, returning grazing to grassland, shelterbelts in the Three North Areas, and saline-alkali land control, carry out pilot projects for photovoltaic sand control, and build a shelter forest system combining arbor, shrub and grass according to local conditions. Establish protected areas closed to desertification land in suitable areas to scientifically fix and prevent sand.

? The main manifestations of land degradation and the causes of desertification;

1 main performance

First, the vegetation is reduced, the ecosystem becomes fragile and the ability to resist natural disasters is reduced; Secondly, the structure and properties of soil have changed, resulting in the decrease of soil moisture and nutrients, fertility and anti-erosion ability; Third, the biomass is reduced, and the available land area is reduced; Fourth, the reduction of surface coverage can not protect and improve the climate; Fifth, the land productivity has declined, and the available land area has decreased.

2. There are two reasons for the occurrence and development of desertification: natural factors and human factors.

Natural factors include climate change, geological and geomorphological conditions, water resources, vegetation cover, glacial meltwater and groundwater recharge in arid and semi-arid climate areas.

The human factors of desertification include excessive logging, overgrazing, excessive reclamation, unreasonable exploitation of mineral resources and unreasonable utilization of water resources. Man-made factors and natural factors comprehensively act on the fragile ecological environment, resulting in the destruction of vegetation and the emergence and development of desertification.