Afforestation techniques
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Koelrenteria paniculata is also known as the lantern tree, the black leaf tree, which belongs to the genus Eucalyptus. The tree is tall and upright, with dense and beautiful foliage. The spring leaves are drunk, the summer is full of yellow trees, the autumn leaves are bright yellow, and the autumn leaves are full of beautiful trees. They are extremely beautiful ornamental trees. Especially in October, the fruits of red blossoms resemble lanterns, and are covered with branches and green leaves. They are beautiful and colorful, adding many scenic views to the city's autumn gardens. Eucalyptus is a deciduous tree with a height of up to 15 mm. The bark is gray-brown and branchlets are slightly ribbed. No apical shoots, lenticels apparent. The odd-numbered two-pinnate compound leaves, 7-17 lobules, are born on the total leaf axis, oval-shaped long oval, irregular coarse serrated edges, near the base often deep lobes, along the back of hairy hair. Flowers golden yellow, large panicles apically. The pods are enlarged, reddish-brown or orange-red when mature, the peels are thin, triangular-oval and resemble lanterns. Round, black. Flowering from June to August, fruit ripening period from the end of September to October. It is produced in northern and central China, north from the southeast, south to the Yangtze River basin and Fujian, west to southeast Gansu, and central Sichuan. It is more common in North China; Japan and North Korea are also numerous. Mostly distributed in low mountains and plains below 1500m above sea level, up to 2600m above sea level. Commonly cultivated varieties are var. intergri fola, also known as mountain bladder, full leaf oak, deciduous trees, branchlets brownish red, densely dermal pores. Leaflets 7-9, entire or sparsely serrate. Yellow flowers. Fruit red. Mainly distributed in the southwest and central China. K. bipinnata, deciduous tree, up to 20m, yellow flowers, purplish red, two pinnately compound leaves. The cultivars of eucalyptus are: Jeptember (Jeptember), flowering from August to September, fastigiata, crown-shaped towers; they can all be grafted. Mainly produced in the southwest of the subtropical region of China, all of them can be used for sowing and breeding, and they are suitable for use as tree shade trees and street trees. Eucalyptus is a positive tree species, hi light, slightly shade-tolerant, hi humid climate, but has a certain tolerance for cold and drought. The soil is not very strict, resistant to slim, and is born in calcareous soil. It is also resistant to salting and short-term leeches. It grows on slightly acidic and slightly alkaline soils and grows well in moist and fertile soils. It is a deep-rooted tree species, which is strong and powerful. The saplings grow slowly, and they grow faster afterwards. Strong anti-smoke capability and strong resistance to sulphur dioxide. Eucalyptus trees are mainly propagated by sowing methods, and they can be planted and rooted. Seeds generally mature from September to October, and the seeds must be harvested at a good time. If the seeds are harvested too early, the seeds germinate at a low rate. If the seeds are too late, they are not easy to collect. After harvesting the fruits, the pure seeds can be obtained by removing the membranous husks and other impurities. The seeds are black, spherical, with a diameter of about 0.6 cm, the seeding rate is about 20%, the grain weight is about 150 g, and the germination rate is 60%. 80%. Seeds are sown in the spring of the following year. The seeds germinate every other year. Because the seed coat is hard and hard to permeate, if it is not treated in the spring of the second year, it often does not germinate or germination is low. Therefore, it is best to sow in the fall of the year, and after 1 winter, the second year of spring will germinate neatly. It is also possible to use layers of wet sand for burial and for overwintering. In late autumn, the terrain is selected for dryness, drainage is good, and leewards are sunny to dig pits. The pit width is 1 to 1.5m, deep above the groundwater level, and about 1m below the frozen layer, depending on the number of seeds. The bottom of the pit can be covered with soil gravel or coarse sand, about 10 to 20cm thick, and insert a bundle of grass in the pit for ventilation. Mix the disinfected seeds with wet sand and put them into the pit. The volume ratio of seeds to sand is 1:3 to 1:5, or 1 layer of seeds is stratified and stratified. The thickness of each layer is about 5cm. The humidity of the sand is held by hand and it is not suitable for water. Install about 20cm from the ground, covering 5cm river sand and 10-20cm thick straw, etc., digging around the drainage ditch. In the following year, the seeds will be removed and sown directly. About 40 days before sowing, seeds are soaked in warm water of 80°C and then mixed with moist sand to germinate. When the number of seeds of the split mouth reaches more than 30%, the seeds can be sowed, the sowing depth is 2cm, the row spacing is 25cm, and the seeding rate per acre is 4～ 5kg, cover soil 2 ~ 3cm. When the seed germination is unearthed, it is necessary to intensify conservation. When the seedling height is 5 to 10 (2m, 1 seedling is planted, and 100 seedlings per 10 square meters are appropriate, it is necessary to pay attention to cultivating and weeding, timely topdressing, prompting vigorous growth of seedlings, and defoliation of autumn seedlings. Afterwards, they can be planted into a furrow and planted in the spring of the following year.Because the trunks of eucalyptus are not easy to grow straight, the seedlings can be straightened with suitable dense planting or cultivating by flat stems. 100cm.The seedlings are usually transplanted 2 or 3 times in the nursery, and the main root and the thick lateral roots are properly cut at each transplant, which can promote multiple fibrous roots and make the colonization easy to survive.The eucalyptus is adaptable to drought, moisture and Snow and snow all have a certain resistance, and the post-planting management work is relatively simple.The canopy has natural pruning performance, and does not need to be trimmed to allow it to grow naturally.It is only necessary to remove the dry, diseased and dried fruit spikes after autumn, and the pests can be large. Crab moths, moths, and hornbills are less common. Eucalyptus canopies are spherical or umbrella-shaped and suitable for planting in gardens, poolsides, roadsides, or grasslands. They can also be used as shelter forests, soil and water conservation, and barren mountain tree species. It can be used to make lubricating oil and soap, flowers can be used for medicinal purposes and yellow dyes, leaves can be used as dyes, wood is more brittle, suitable for furniture, appliances, etc.