The floorboard of deciduous trees in Salicaceae.
There are more than 100 species in this genus, which are mainly distributed in temperate and cold zones in Europe, Asia, North America, Mediterranean countries and the Middle East.
There are more than 50 species in China.
Wood is used as civil building materials to produce furniture, matchsticks, sawn timber, etc. And used as wood boards and fiber materials.
Leaves are good feed.
Poplar is also the main tree species in timber forest, shelter forest and surrounding greening.
The terminal buds of poplar twigs have more than two bud scales.
Simple leaves alternate, ovate or suborbicular.
Catkin, dioecious.
capsule
The seeds are small and have crests.
In China, the distribution range spans 25 ~ 53 N and 76 ~ 134 E, covering northeast, northwest, north and southwest.
In recent years, the introduction of Populus deltoides has moved the cultivation area south to the plains of Hubei, Hunan and other provinces.
Populus euphratica is divided into five groups: Populus euphratica, Populus alba, Populus nigra, Populus cathayensis and Populus macrophylla.
Poplar likes light.
Temperate climate and cold tolerance are required.
The requirement for water is very strict, because its photosynthesis and transpiration are higher than those of other broad-leaved trees.
Poplar seeds are small, and the capsules will crack when they mature, so the seeds are collected from cutting ears or ground.
Seeds are easy to lose germination ability, so they should be sown with the harvest.
Sowing seedlings on sandy loam soil containing humus.
Poplar seedlings are mostly asexual propagation.
Trees that are easy to take root, such as Populus deltoides, Populus simonii and Populus euramericana, are used for cutting seedling.
Trees with difficulty in rooting, such as Populus tomentosa, are treated with growth regulators before cutting, or poplar branches with difficulty in rooting are grafted to poplar trees with easy rooting, and then cuttings are used to raise seedlings.
Poplar trees with strong rooting and tillering ability can be ditched near big trees to cut off their lateral roots, or cut off their roots on seedbeds to promote the occurrence of root tillers and seedlings.
Afforestation needs deep loam or sandy loam, and sandy loam or moist cinnamon soil is better in North China Plain.
If the groundwater level is too high, ditch drainage is needed.
The improvement methods of poplar varieties include selection breeding, cross breeding, polyploid breeding, mutation breeding and so on.
There are many kinds of poplar diseases, which are very harmful.
There are mainly leaf spot, leaf spot, rot, canker, nodule and purple root rot.
The main pests are green blind stinkbug, green blind stinkbug, giant salamander, ground beetle and so on.