01 standards for site leveling and soil planting (I) site leveling 1
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Tall deciduous trees with obvious trunk shall try to maintain the original tree shape and comb the branches properly
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Excavation time: try to avoid the weather with high temperature, heat and strong light, and it should be carried out in the cloudy morning or evening to reduce the water evaporation of trees
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Small shrubs with obvious branches and flower buds sprouting from new branches can be properly pruned according to their tree potential to promote the growth of new branches and renew old branches
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Street trees and row trees should be on the same line（ 3） Planting hole specifications and excavation requirements 1
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If time permits, root cutting shall be carried out by stages and zones alternately
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Water appropriately according to the dry and wet conditions of the soil 1-2 days before excavation, so as to prevent the soil ball from loosening due to too dry soil
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For seedlings with diameter of less than 10cm, several side branches on the trunk can be reserved to maintain the original tree shape for short cutting
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2
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For root moisturizing, spray moisturizing agent or mud to dip the root to reduce root water loss
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The cut shall be smooth and shall not be split
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In this article, we will focus on the precautions of landscaping construction standards
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The bottom soil shall be scarified to a depth of 30cm at an interval of 1cm, and sundries with a diameter of more than 5cm shall be removed; The topsoil shall be completely scarified and sundries with a diameter of more than 2cm shall be removed; After the topsoil in the lawn area is completely scarified, remove sundries with a diameter of more than 2cm
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2
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6
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2
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After the acceptance of the slope, the acceptance shall be based on the effect after settlement
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When trimming large branches and thick heels with a diameter of more than 2cm, the section must be flattened and coated with preservative
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For long-distance transportation of bare root seedlings, the root pocket shall be filled with wet grass or wrapped with plastic film for moisturizing, so as to avoid excessive root water loss and affect the survival rate, and attention shall be paid to sunscreen
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3
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If the planting soil is too poor, it is necessary to apply enough fully decomposed organic fertilizer at the bottom of the hole as the fertilizer bottom, and backfill 30cm planting soil
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It is best to apply 0.2% – 0.3% urea solution to the root 5-8 days before excavation to increase the absorption of nutrients by the tree
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Generally, the diameter of planting hole is greater than 80cm, the depth is greater than
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The planting hole must be excavated vertically with the same diameter up and down, and the soil at the bottom of the hole shall be firm or compacted to avoid too fast leakage during irrigation
2
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2
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In case of large root system during excavation, it must be cut off with a sharp saw to avoid root cracking and earth ball cracking
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Timely remove miscellaneous grass roots in the soil and clean up large stones
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The position of street trees shall be accurate, subject to the design drawings, and the minimum planting plant spacing is 4 plants and trees
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2
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Seedlings shall be transported in time after excavation
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Root beating is one of the common protection methods, which can improve the survival rate by more than 20%
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4
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If special circumstances need to be handled, it shall be approved by relevant personnel of Party A
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3
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The size of planting hole is determined according to the seedling root system and soil ball diameter
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When the soil is too dry, sufficient water shall be poured 3-5 days in advance
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Trees and shrubs used as hedges can be shaped and trimmed according to the design requirements after planting（ 3） Seedling pruning quality standard 1
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6
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5
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The flatness and slope shall meet the design requirements
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If there are underground pests, sterilization and disinfestation shall be carried out in advance
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The retained main and side branches shall be short cut on the strong buds, and 1 / 5 of the branches can be cut off
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4
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3
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0
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The crown of precious tree species shall be thinned（ 2） Pruning requirements for shrubs and vines 1
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2
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The soil of the planting land shall not contain construction waste soil and other harmful components
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After taking trees, branches shall be collected for many times in time.
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Deciduous trees without obvious trunk and dense branches can comb branches to maintain the original tree shape for trees with trunk diameter of more than 10cm
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4
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Proper pruning of branches and leaves: in order to reduce the water transpiration of seedlings, the branches and leaves shall be properly pruned before loading, with emphasis on reducing broken branches, over dense branches, overlapping branches, rotating branches, lower hanging branches, bare long branches and pest branches
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3
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When the soil layer is dry, the planting hole shall be soaked
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5
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The backfill of planting holes shall be loose and fertile, and shall be filled with water and compacted immediately after backfilling to ensure full contact between roots and soil
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Accurately measure the ground elevation and make slope according to the design drawing, conduct multiple irrigation and settlement of the land, and timely supplement the settled soil
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Root pruning: prune excessively long main roots, lateral roots and injured roots
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3
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The cutting mouth shall be smooth and coated with wound applicator
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5
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3
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If the drainage is poor or the groundwater level is too high, 15 vegetation and gravel shall be paved at the bottom of the hole, or seepage pipes, blind ditches, or the ground shall be raised to facilitate drainage
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Otherwise, without approval, Party A has the right to require the construction unit to turn over all positions and pile the slope again
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Then wrap wet hemp slices and straw rope to moisturize
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4
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Draw a circle according to 5 times the dry diameter, and dig a ditch of 40cm and 50cm deep along the circle
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Root cutting and lump shrinking: for trees that have not been transplanted or root cutting treatment within three years, if possible, root cutting and lump shrinking shall be carried out 6 months before transplantation
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Pay attention to the burying of underground trunk pipelines during planting hole excavation to avoid damage
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The root cutting area shall be backfilled with fertile soil to promote the generation of a large number of fibrous roots（ 2） Treatment after seedling excavation 1
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3
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4
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Cleaning, disinfection and sterilization: the physical and chemical properties of the soil in the planting area shall be preliminarily analyzed before planting
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Necessary drainage ditches shall be set around the planting soil to ensure smooth drainage and no ponding
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Slurry water ratio: 1kg of calcium superphosphate + 7.5kg of fine loess + 40kg of water, stir into paste
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The time is generally in the root growth period before germination in spring, after the aboveground part stops growing in summer and before defoliation in autumn
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Pruning principle: cut off disease and insect branches, dead branches, weak branches, over dense rotating branches, bare branches and redundant drooping branches
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2
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For planting plants, the following minimum planting soil layer thickness shall be met: 3
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Effective soil layer under arbor soil ball and root system ≥ 30cm
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Reference standard: there shall be no stones with a diameter greater than 5cm within 30cm of the topsoil
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During site leveling, the central soil surface shall be higher than the kerb or retaining wall, and the edge soil surface shall not be lower than the kerb or retaining wall by 3cm
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When the branch is short, the outer bud shall be left, and the shear opening shall be 1cm above the position of the bud
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2
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5
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The tree crown shall be trimmed in time to maintain the balance between above ground and underground（ 1） Tree pruning requirements 1
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04 seedling transplantation and maintenance management (I) seedling excavation 1
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Meanwhile, the planting soil shall be scarified to keep the topsoil loose, ventilated and good water permeability
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5
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02 excavation of planting holes and grooves (I) before excavation of planting holes and grooves, the construction unit shall take the initiative to learn from the developer about the embedding of underground pipelines and concealed objects for greening construction（ 2） Requirements for fixed-point setting out 1
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The fixed-point setting out of planting hole shall meet the requirements of design drawings
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If the rhizome is more than 2cm, use wound applicator to disinfect the root wound to prevent the decay of injured roots
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4
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The effect requirements of site leveling are: full soil type, no subsidence, no obvious settlement, and natural and gentle slope（ 2） Planting soil 1
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The planting hole shall be well drained
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Collecting tree crown: the tree crown of trees shall be protected by full crown width
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The form and height of topographic slope shall be in strict accordance with the drawings, and subsequent planting (shrubs, lawn, etc.) shall be carried out only after being approved by the project engineer in charge and designer
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Lawn planting land and flower planting land shall be applied with sufficient base fertilizer, ploughed for 30cm, raked flat and raked fine, and sundries shall be removed
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03 seedling pruning before planting, the seedling root system shall be pruned, and the split root, pest root and over long root shall be cut off
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0, and the thickness of soil ball is greater than
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For trees used as street trees, the trunk height shall be greater than 3m, all branches below the first branch point shall be cut off, and the branches above the branch point shall be thinly cut or short cut as appropriate, and the original shape of the tree crown shall be maintained
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