Cultivation techniques of Metasequoia glyptostroboides in Jiangxi Province

Metasequoia glyptostroboides is an ancient and rare tree species originating in Hubei Province of China, which has been listed as a national first-class protected tree species. It is fast-growing, light-loving, cold-tolerant and adaptable, and has been introduced and cultivated in the north and south of our country. The origin is distributed at an altitude of 900-1500 meters, mainly growing in valleys, streams and mountain valleys with good drainage. However, in the low wetlands where the groundwater level is too high and long-term stagnant water, the growth is poor. In general, the river alluvial soil in the plain is better for introduction, while the hilly area grows vigorously in the mountain yellow soil, and the mountain depression and humid foothills and gentle slopes are more suitable.

Afforestation techniques:

The main results are as follows: (1) Seedling sowing or cutting seedling raising, but at present, there are few mother trees and limited seed yield, so cutting seedling is the main method.

Sowing seedlings: Metasequoia glyptostroboides seeds are small, avoid drought and waterlogging, we should choose flat terrain, convenient drainage and irrigation, fertile, loose sandy loam as nursery land. The suitable sowing time is that the soil temperature is above 12 ℃, mostly from late March to early April. In the seed germination and seedling stage, we should pay attention to frequent watering, keep the soil moist, and properly shade.

Cutting seedlings: cutting in late March and early April, cutting along with cutting. Cuttings were cut from 1 ~ 2-year-old seedlings or new shoots germinated in the same year. The lower end of the cuttings was treated with naphthalene acetic acid at the concentration of 50ppm and soaked for 24 hours to promote rooting and improve the survival rate. Cuttings of 100,130 plants per square meter. After cutting, the seedbed is kept moist. After about 40 days, the new roots germinated and thin human feces and urine were applied every 10 days for 3 times. Nitrogen fertilizer can be applied in June, preferably less and more times, 3-4 kg urea per mu, flushing and pouring. Phosphorus and potash fertilizer was applied once in the first ten days of August, 15 kg of compound fertilizer was applied with flushing water per mu, and 20 kg of phosphate fertilizer was scattered on the seedbed.

(2) afforestation: afforestation can be done from late autumn to early spring, and it is better at the end of winter. 2-year-old seedlings with a height of 1.5-2.0 meters and a ground diameter of more than 3-4 centimeters are selected. The row spacing of 2 × 3 meters can be used with 110 plants per mu. Large hole ground preparation, hole diameter 50-60 cm, depth 50 cm, return to the soil when the appropriate application of base fertilizer. Comprehensive soil preparation can be used in forest-grain intercropping. 3. Tending management should be nurtured in time after afforestation. Watering in April and May is the key to survival. When planting big seedlings, special attention should be paid to drought resistance in the hot season. Weeding and loosening soil were carried out two or three times a year, and the tending effect was significant from May to June and from August to September. Two years later, it is necessary to apply fertilizer before germination in spring. Generally speaking, pruning is not necessary before the forest is formed, but it should be pruned moderately after the forest is established. When the tree height is 6 to 10 meters, the pruning height is 1/4 to 1/3 of the tree height; when the tree height is 10 to 15 meters, the pruning height is 1/3 to 1/2 of the tree height.