Vegetation restoration technology of fixing mobile dune with PLA sand barrier
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表 1 Topographical conditions
Elevation Topography Slope gradient Slope direction Slope position □ < 100 m □ Flat lands ■ Flat (0-5%) □ Sunny □ Up □ 101-500 m □ Hillside ■ Gentle (6-15%) □ Shady □ Middle ■ 501-1, 000 m □ Hilly slopes □ Slope (16-25%) □ Half-sunny □ Down ■ 1, 001-1, 500 m □ Slopes □ Steep (26-35%) □ Half-shady ■ 1, 501-2, 000 m □ Valley floor □ 2, 001-2, 500 m ■ Sand dunes □ 2501-3, 000 m ■ Flat sandy land □ Cultivated land that slopes gently 
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表 2 Soil condition
Soil types Soil texture Effective soil layer thickness Organic matter content of surface soils Soil hardness Soil gravel content ■ Aeolian sandy soil ■ Sandy soil □ 0-20 cm □ High (> 3%) □ High ■ Light gravelly soil (1-5%) □ Calcium chestnut soil □ Sandy loamy soil ■ 20-50 cm □ Medium (1-3%) □ Medium □ Medium gravelly soil (5-10%) □ Brown calcium soil □ Loamy soil □ 50-100 cm ■ Low (< 1%) ■ Low □ Gravelly soil (10-30%) □ Cinnamon soil □ Clay □ 100-200 cm □ Light gravel (30-50%) □ Saline-alkali soil □ > 200 cm □ Medium gravel (50-70%) □ Others: □ Heavy gravel soil (> 70%)
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表 3 Vegetation status
Vegetation type Community coverage Vegetation degradation status □ Planted forest: (what kind of community) ■ < 5% □ Light ■ Sandy vegetation: (Agriophyllum squarrosum (Linn.) Moq and Corispermum hyssopifolium L.) ■ 5-15% □ Moderate □ Bush: (what kind of community) □ 15-25% ■ Severe □Grassland: (what kind of community) □ 25-40% □ Artificial forest with dead treetops □Meadow: (what kind of community) □ > 40% □ Artificial forest with dead trees □Others:
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表 5 For specific technologies, please fill in the relevant information by selecting the technology category below.
Technological flow The main points of the technology Time (season or month) 1. Specific technical measures: sand fixation, artificial tree planting, seeding afforestation. Sand fixation: PLA material.
Tree planting: Pinus sylvestris var. mongolica Litv., Salix gordejevii Y. L. Chang et Skv., Ulmus pumila L., etc.
Seeding afforestation: Artemisia desertorum Spreng. Syst. Veg., Corethrodendron fruticosum var. mongolicum (Turczaninow) Turczaninow ex Kitagawa, Agriophyllum squarrosum (Linn.) Moq.Spring, rainy season 2. Land preparation: hole-shaped land preparation. Planting while digging. Rainy season 3. Density, configuration, planting pit specifications: Afforestation density: trees 2m × 4m, shrubs 1m × 4m. Afforestation configuration: stripes with widths of 6-10m. Planting pit specifications: tree container seedlings, 30m × 30cm × 40cm, bare root seedlings 50m × 60cm × 60cm. Artificial afforestation and revegetation under the protection of sand barriers.
Sand barrier specifications: strip sand barrier with a width of 2-4m, grid sand barrier 2m × 2m.
Direct planting afforestation: 4:2:4 ratio of Artemisia, Corethrodendron fruticosum var. mongolicum (Turczaninow) Turczaninow ex Kitagawa and Agriophyllum squarrosum (Linn.) Moq., 0.5kg seed per mu.Spring, rainy season 4. Seedling requirements: Pinus sylvestris var. mongolica Litv. container seedlings 30-50cm, tree bare root seedlings 2-3cm in ground diameter. Grade II or higher-grade seedlings, free from disease and insect damage, with full top buds of conifers. Seedlings are treated with moisture throughout. 5. Planting: Planting while digging. Remove plastic containers from container seedlings for planting and trample them down. Spring, rainy season. 6. Nurturing management: grazing ban, replanting Fencing of the project area. 3 year grazing ban. 7. Others
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表 6
Labor cost: 3, 000~4, 500 RMB / ha Material cost: 7, 500~13, 500 RMB / ha Water cost (if irrigation was required): rainwater irrigation Total cost: 10, 500~19, 500 RMB / ha
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