Seed collection time and method of Pinus koraiensis?
The time and method of seed collection of Pinus koraiensis are as follows: the number of fruiting trees in the 80-100-year-old stand of Pinus koraiensis accounts for more than 91%. In order to solve the problem of seed shortage of Pinus koraiensis, clonal seed orchard has been established, but it has not borne a lot of fruit at present. On the other hand, the stand with good site conditions and strong growth in the natural forest should be designated as the mother forest, and the tending management should be strengthened to prepare for seed collection. Korean pine cones mature from September to early October, when the cones change from green to yellowish green, some seed scales crack and enter the early ripening stage. After that, the seed scales gradually turn yellow, individual cones begin to fall off, and the fruit is ripe, so it should be collected in time. The collected cones were ripened in a ventilated and dry place. Be careful not to make it hot. When the scales of most cones separate, they can be threshed. Then water selection, drying, removal of impurities, when the seed moisture content is reduced to 9%, it can be put into an iron bucket and placed in a ventilated and dry seed bank or underground bank; stored at 4 degrees Celsius. The 1000-seed weight of Korean pine seeds varies greatly, from about 600 grams for large seeds, 350 to 400 grams for medium seeds and 270 grams for small seeds.
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Large seedlings of Pinus koraiensis to build Mother Forest
Korean pine, Pinus, Pinus, evergreen coniferous trees. It is mainly distributed in Xiaoxing'an Mountains and Changbai Mountain in China. Pinus koraiensis forest is the top community in this area, which plays an important social, ecological and economic role. In the early days of the founding of New China, in order to meet the needs of economic construction, excessive cutting of Korean pine trees was carried out, resulting in a large reduction of Korean pine trees. at present, there are only about 5 million mature Korean pine trees. Therefore, the massive, rapid and high quality construction of Pinus koraiensis mother forest is important for the restoration and development of the top community of Pinus koraiensis forest in Xiaoxinganling and Changbai Mountains.
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Planting and raising seedlings of Pinus koraiensis?
The method of sowing and raising seedlings of Pinus koraiensis is: spring sowing is suitable. The northeast region is better from mid-April to early June. Sowing or strip sowing is OK. In recent years, the seeds are usually sown with wide strips, with a width of 8 to 10 centimeters. After sowing, the soil is suppressed once and then covered with soil, which is about 2 cm thick. If it can be irrigated in time, no grass can be covered after sowing, and all-light seedlings can be raised. In order to kill weeds, before emergence after sowing, 3 grams of herbicide per square meter, 1 gram of atrazine or 2 grams of promethazine can be sprayed on the bed surface. Do not irrigate within 10 hours after spraying. The sowing rate of Korean pine is 3000 to 37 per hectare.
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