Patch-based reconstruction technology of moderately and severely degraded poplar plantation
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表 1
Climate zones Temperate semi-arid zone, temperate sub-humid zone Average annual precipitation/mm 340-450 mm Average annual evaporation/mm 1735.7mm Average annual temperature/℃ -0.3 ~ 9℃ Maximum temperature/℃ 32℃ Minimum temperature/℃ -32℃ Average annual wind speed/ m/s 4.3m/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. 
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表 2 Basic information about the demonstration area
Province County Township Climate zones Longitude Latitude Elevation/m Hebei Province Zhangbei County Mantouying Town Temperate semi-arid continental monsoon climate region 114°35′E 41°15′N 2128
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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
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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%)
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表 5 Vegetation status
Vegetation types Community coverage Vegetation degradation status ■ Planted forest: (what kind of community) □ < 5% □ Light □ Sandy vegetation: (what kind of community) □ 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 7 For technology specifics, 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. Land preparation Preparation: After block thinning, the roots were removed or dug trenches 2.5 m away from the roots, paralleled to the stand, 30 cm deep and 40 cm wide, using a tractor.
Other requirements: the trench should be deep and straight.Spring (May) 2. Pruning None 3. Selective felling Selective felling was used to dead, semi-dead and diseased wood in moderately and severely degraded poplar plantations. Clear-cutting was applied to some small blocks or patches to promote the growth of stump sprouts and to reestablish an uneven-aged multi-layer plantation. Early Spring (April) 4. Regeneration and rejuvenation During June and July in the year of trenching, a large number of stubble sprouts will be produced. When the sprouts grow to 30-50cm high, choose and keep two vigorous and upright sprouts, and erase the rest. Remove the lateral buds of the two sprouts to promote their upright development. When the sprouts grow to 60-80cm, select and keep only the best ones, pruning and earthing, for nursery stock at a spacing of 3 m × 3 m. Replanting Pinus Sylvestris in the position where the stubbles failed to sprout. Summer (June-August) 5. Stand tending Build enclosure to protect the sprouts. Mowing, pruning, and earthing regularly during the juvenile period of the sprouts at 3m × 3m spacing. Spring and summer (April - August) 6. Others Attached table or Appendix (if there are relevant technical parameters indicators, you can add the information here)
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表 8
Labor cost: 6, 300 RMB / ha Machinery cost : 900 RMB /ha Material cost: 900 RMB / ha Water cost (if irrigation was required): 0 Total cost: 8, 100 RMB / ha
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