In 1967, the Food and Agriculture Organization of the United Nations formed an expert group on forest genetic resources to plan and coordinate work on the collection, utilization and conservation of forest genetic resources(288 cell trays bulk). Such resources are subject to the long-term role and selection of local natural conditions(11.43cm square grow pots). For the former, they are still affected by the management and human selection of carrier training. It accounted for 2.01% of the total land area.
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They are most adaptable to local conditions(20 cell trays bulk). Generally, it can also meet the needs of production. Exploration of the rejuvenation of the old plants in asexual reproduction, improvement of the reproduction coefficient, optimal reproduction conditions, etc. are still the main problems, and tissue culture may become the main reproduction method in some tree species(small plastic hanging baskets). Adopt appropriate technology to promote flowering is the key to speed up the breeding process.(plastic cell seedling trays suppliers in netherlands)
To study the mechanism of flowering and fruiting of forest trees, therefore, as far as the current production level is concerned, the trunk volume grows fast and the straight shape is an important economic trait(50 cell seed starter trays). About 8,000 species of woody plants have been found, including more than 2,000 species of arbor species and more than 6,000 species of shrubs(11.43cm square nursery pots). After the Third Plenary Session of the Eleventh Central Committee of the Party, the nature conservation work has been restored and developed.
(plastic cell seedling trays suppliers in netherlands)Excellent forest stands 2000ha have been retained(72 cell seed starter trays). In addition, for the selected superior trees that meet the criteria, a superior tree collection area has been established. At present, 105 collection areas have been established with a total area of more than 240ha(greenhouse trays and pots). The United States uses national and state nature reserves to preserve natural genetic resources, and at the same time, various breeding units generally set up superior tree collection areas to collect superior tree resources.
By the end of 1986, 333 nature reserves had been established nationwide, covering an area of about 19.33 million a(18 cell seed starting trays). In addition, a number of breeding resources have actually been collected in the provenance experiments that began in the 1950s and the selection of a sub-orchard in the 1960s. Provenance test forests and excellent tree collections are all important collection sites for breeding resources(thermoform pots). In the future, the accumulation of tree biomass may become the main goal.
In addition to the establishment of forest protection areas by the state, Finland has carried out deforestation of excellent natural forest stands to ensure renewal(20 cell seed starting trays). This is a deep material basis for breeding. At the Rome Conference in 1974, the group put forward five contents for the work of genetic resources: hairdressing, collection, assessment, preservation and utilization(v10 nursery pots). Preserve rich breeding resources in the form of natural forest structure.(plastic cell seedling trays suppliers in netherlands)
In the forest areas of Xing'an Mountains and Changbai Mountains in Northeast China(40 cell seed starting trays), there are Larix gmelinii, Larix olgensis, Pinus koraiensis, Red Spruce, Fish Spruce, Red Pine, Stinky Fir, Ash, Purple Pole, Sugar Pole, Yellow Wave Luo, Huqiao, Chunyu, Liaoyang, Daqingyang, Alnus, Mongolian standard, etc(hydroponic farming tray). China is extremely rich in tree species. Among the arbor species, there are more than 1,000 species of excellent timber and unique economic trees.