1 Snow disaster type and characteristics
The snowflake types of flower seedlings are snow pressure, freezing, and freezing, and in addition there are blisters. After a large amount of snow melts in the nursery, water accumulation in the nursery is excessive, which cannot be used and discharged in time. Bracting occurs, affecting the normal growth of seedlings. The phenomenon.
2 seedling production snow disaster prevention measures
2.1 Seed Production
2.1.1 The management of the seed collection base. When trees of the planting (strip) base are affected by snow pressure, snow folds, or snow fall, the trees shall be uprooted in a timely manner, and the snow and wood shall be removed, and the trees shall be properly planted.
2.1.2 allocation of forest seedlings. Introduce the seed introduction, seed collection and seedling planning in advance. When allocating forest seeds and seedlings from different places, the seeds and seedlings of the most suitable species should be called in accordance with the principle of seed and seedling allocation.
2.1.3 Introduction of resistant tree species. When carrying out seed allocation or tree species introduction, full consideration shall be given to the characteristics of tree species such as resistance to snow disasters and cold-tolerance.
2.2 Seedling Production
2.2.1 Formulation of disaster relief plans. Organize production and technical personnel to timely evaluate the types of snow disasters in the nursery and the extent of the disasters, formulate corresponding technical solutions for disaster relief production, and guide them in a systematic manner, and carry out the production of nursery in an orderly manner.
2.2.2 Raise the ground temperature. Residues such as crop residues or plastic films can be used to cover seedlings or seedbeds and windbreaks can be installed to increase ground temperature and reduce freezing damage after a snowstorm.
2.2.3 Management of affected nursery stocks. After the melting of ice and snow, the seedlings that are bent, shed seedlings, or rooted and unfrozen due to freezing and thawing should be timely cultivated, reinforced, replanted, reinforced, and replanted. Fertilizer management should be carried out in a timely manner to increase seedling resistance and reduce losses.
2.2.4 The conservation of large seedlings. For snow-breaking, frozen-breaking shoots, and broken seedlings, timely pruning, shaping, or flattening should be performed before spring sprouting. The more severely affected by freezing is the autumn branches, which are annual branches. When trimming, care should be taken to cut the wounded part from the slightest point of cut. The knife edge should be smooth in order to facilitate new germination, minimize loss, and prevent the disaster from worsening. The branches that are caused by freezing snow and causing chapped or broken wounds should be promptly taken. Supporting, lifting, tying, and other measures to restore it in place and fixed, let it heal.
2.2.5 Preservation of valuable seedlings. For the precious green seedlings, ropes can be used to wind the main trunk and the main branch. Places where conditions permit can be covered with plastic film to prevent freezing and cracking of trunks and branches.
2.2.6 Protection of grafted seedlings. For grafted seedlings of economic forest species or precious tree species, insulation measures such as sealing and sealing wax can be used to protect the marrying interface to prevent and reduce freezing damage to seedlings.
2.2.7 Management of facility nursery. General plant breeding seedlings for cutting propagation, requiring higher temperature and humidity conditions, should take timely measures including artificial warming and other measures to restore the temperature within the shed to ensure the normal growth of seedlings.
2.2.8 dredge irrigation system. After the heavy snowfall, the water accumulated in the nursery may form. In the effective use of snow melt water, it is necessary to do a good job of cleaning and dredge the drainage and irrigation system to avoid disasters.
2.2.9 Control of seedling pests and diseases. To investigate and clean up the cold-rising seedlings in time to monitor the occurrence and development of plant diseases and pests in the nursery, and conduct timely control of possible pests and diseases.
2.2.10 Rescue of precious and breeding materials. Effective rescue measures for rare materials, germplasm resources, and important forest tree breeding materials (hybrid combinations, parents, clones, families, etc.) in areas with snow damage, including cuttings, grafting, and tissue culture. Timely reproduction and preservation.
2.2.11 Transplantation of damaged seedlings. After pruning seedlings or incomplete seedbeds, seedlings can be transplanted to cultivate the roots of the developed seedlings and increase the resistance of the seedlings. When transplanting, attention should be paid to transplanting according to the seedlings' grade division and classification for easy management.
2.2.12 management of nursery files. The records of the status of various types of nursery stocks, the status of their growth, and the technical measures and effects of disaster relief are recorded to provide the basis for future seedlings.
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