Metasequoia glyptostroboides, a precious relict tree species
Scientific name: Metasequoaglyptostroboides
Families and genera: Taxodiaceae, Metasequoia
Deciduous trees are precious relict plants in China. Metasequoia glyptostroboides has the advantages of rapid growth, strong adaptability, straight stem, less diseases and insect pests and so on. Wood is light and easy to process, but its strength is weak and it is not resistant to decay, so it can be used for construction, furniture, papermaking and so on. Metasequoia glyptostroboides has strong cold resistance, which requires moist soil and can grow in light saline-alkali soil. Huge tall and straight, luxuriant branches and leaves, changeable leaf color, suitable for concentrated afforestation or cluster planting, is also an excellent tree species for four sides and garden greening.
Seeds: flowers unisexual, monoecious. Male flowers form late, because of sterility at flowering stage, there are many empty seeds, flowering from February to March, cones mature from October to November, and the cones are yellowish brown or dark brown when they mature. The weight of 1000 seeds is about 1.75-2.28g, 440000-580000 per kilogram. Due to the large proportion of embryless seeds, the germination rate is only 5-11%. The seeds are dried and stored and germinate for one year.
Raising seedlings: small seeds, weak seedlings, avoid drought and fear of waterlogging, nursery land should choose flat terrain, convenient drainage, loose sandy loam. Sowing or strip sowing in spring (row spacing 25 cm), the sowing amount is about 1 kg per mu. The seeds are small and winged and should be sown in sand or fine soil when there is no wind. After sowing, it is covered with fine soil, thick with no seeds, slightly suppressed and covered with grass, which is suitable for sowing in early spring when the soil temperature is above 12 degrees. It germinates 10 days after sowing, begins to be unearthed in 15 days, and comes out in 20 days. The seedlings grow slowly at the initial stage and do not take deep roots. In addition to regular watering, they should be properly shaded to avoid sunburn. The height of one-year-old seedlings is 40-70 cm, and individual seedlings can reach more than 100 cm. When there is a lack of seeds, hardwood or tender wood cuttings can also be used to propagate. Cuttings come from 1-2-year-old young trees, the survival rate is high, with the increase of tree age, the survival rate decreases accordingly.
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Seedling raising technique of Picea koraiensis
Purple fruit spruce (PiceapurpureaMast), commonly known as iron pine, is a tall coniferous tree, which likes wet, cold and dry climate, and the young forest has strong shade tolerance. Mainly distributed in Qinghai, Sichuan and Gansu. It is widely distributed in the shady slopes, semi-shady slopes and river valleys of the Bailong River forest region, Taohe forest region and Daxia River forest region at an altitude of 2800-3600m above sea level in Gannan, forming a unique forest landscape in high mountains. It plays an important role in conserving water sources and preventing soil erosion. At the same time, it is one of the excellent native tree species.
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How to control metasequoia red blight?
Prevention and control methods of red blight of Metasequoia glyptostroboides: first, plant quarantine should be strictly carried out, diseased seedlings should be prohibited from being introduced into new areas, and diseased seedlings should be cleared and burned immediately. Second, the water for planting seedlings should be too dense. It is required to be ventilated and transparent, reduce the humidity in the air, increase the application of phosphorus and potassium fertilizer, and apply less nitrogen fertilizer to promote the healthy growth of seedlings and improve the ability of disease resistance. 3. During April to May and September to October, Bordeaux solution or 50% carbendazim wettable powder or 50% carbendazim wettable powder can be sprayed in a ratio of 1: 1 to 200 times or 50% to 1000 times.
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