Fixation technologies of shifting sand and vegetation reconstruction in activated wind erosion pit
-
-
图 1 Pictures before (a, c, e, 2017) and after (b, d, f, 2019) governance in three separate wind erosion pits at Honghuashan Village, Dahekou Township. Photographer, Yan Deren.
表 1
Climate zones Temperate semi-arid zone Average annual precipitation/mm 250-400mm Average annual evaporation/mm 1700-2000mm Average annual temperature/℃ 1.5-6.0℃ Maximum temperature/℃ 40℃ Minimum temperature/℃ -35℃ Average annual wind speed/ m/s 2.5-3.5 m/s Note: Precipitation, evaporation, air temperature and wind speed in the table are average values over the 1980-2010 period. The climatic data were obtained from local national weather stations. 
下载: 导出CSV
表 2
Province County Township Climate zones Longitude Latitude Elevation/m Inner MongoliaiAutonomous Region Duolunr Dahekou Temperate semi-arid region 116°48'E 42°13'N 1200
下载: 导出CSV
表 3 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
下载: 导出CSV
表 4 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%)
下载: 导出CSV
表 5 Vegetation status
Vegetation types Community coverage Vegetation degradation status □ Planted forest: (what kind of community) ■ < 5% □ Light ■ Sandy vegetation: (Agriophyllum squarrosum (Linn.) Moq and Corispermum hyssopifolium) ■ 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:
下载: 导出CSV
表 7 For specific technologies, please fill in the relevant information by selecting the technology category below.
Technological flow The main points of the technology Season/month of implementation 1. Sand barriers setting Sand barrier materials: PE (polyethylene) mesh with 40% porosity (20 mesh); yellow willow branches.
Types of sand barrier: strip sand barriers, 2-4m wide were used in slopes and bottom of wind erosion pit; checkerboard sand barriers, 2m × 2m - 4m × 4m. were used in sand accumulation area outside the pit.
Laying specifications: PE mesh sand barriers with a height of 10-15cm above ground; yellow willow sand barriers with a height of 15-20cm above ground.
Sand barrier orientation: perpendicular to the main wind directionSpring (April-May) 2. Seeding Plant species: Sagebrush, poplar fir, sago were used in wind erosion pits (slopes, bottoms, and sand accumulation areas outside the pits).
Seed requirements: first- or second-class high-quality seeds.
Sowing method: sowing in the rainy season
Sowing rate: 1.0kg per Mu
Mixing ratio: 4:2:2 for Artemisia: poplar wood: sand rice
Sowing depth: surface sowing
Fertilizer requirements: none
Watering: noneRainy season (June-July) 3. Seedlings planting Seedling type: Pinus sylvestris was chosen to plant in sand accumulation areas outside the wind erosion pits.
Seedling size: container seedlings with height of about 50cm,
Species configuration: none
Plant spacing/density configuration: 2m × 4m
Planting pit size: 30m × 30cm × 40cm
Fertilizer application: none Watering: noneRainy season (June-July) 4. Nurturing management Enclosure: yes
Fertilization: no
Irrigation: noYear-round (January-December) 5. Others
下载: 导出CSV
表 8
Labour costs 2300-3000 RMB/ha Cost of materials 6000-9000 RMB/ha Total cost 8300-12000 RMB/ha
下载: 导出CSV
-
