Green tree species-Robinia pseudoacacia

Robinia pseudoacacia, also known as Robinia pseudoacacia, legume Robinia pseudoacacia. Originating from North America, it has spread all over North China, Northwest and Southern Northeast. Robinia pseudoacacia tall crown, bright green leaves, whenever the flowering season green and white, simple and elegant and fragrant. Can be used as a street tree, court shade tree. Pioneer tree species for industrial and mining area greening and barren mountain and wasteland greening. Robinia pseudoacacia wood is hard and resistant to moisture. Can be used for pillars, sleepers, vehicles, agricultural materials; leaves contain crude protein, which is a good feed for many livestock; flowers are excellent nectar plants, Robinia pseudoacacia flowers are white and transparent, and are welcomed by consumers; tender leaves are edible and have become a green vegetable for urban residents; seeds extract oil for soap and paint raw materials.

Deciduous trees, 10-20 m high. Bark gray-black-brown, longitudinally lobed; branches with stipule needles, branchlets gray-brown, glabrous or puberulent when young. Leaves odd-pinnate, alternate, with 9-19 leaflets; petiole 1-3 cm long, petiolule ca. 2 mm, pubescent, leaflet ovate or ovate-oblong, 2.5-5 cm long, 1.5-3 cm wide, base broadly cuneate or subrounded, apex rounded or retuse, spinulose, entire, surface green, puberulent, abaxially gray-green pubescent. Racemes axillary, shorter than leaves, inflorescence rachis yellow-brown, sparsely short hairy; pedicels 8-13 mm long. Pubescent, calyx campanulate, with irregular 5-toothed fissures, surface short hairs; Corolla white, fragrant, suborbicular, 18 mm long, base clawed, apex retuse, winged Obovate-oblong, base with slender long claws, tip round, 18 mm long, keel bent inward, base with long claws; stamens 10, into 9 and 1 dichotomous Ovary linear-oblong, covered with short white hairs, style almost curved at right angles, pods flattened, linear-oblong, 3-11 cm long, brown, smooth. Contains 3-10 seeds, bivalvular. Flowering and fruiting period from May to September.

Robinia pseudoacacia likes light and warm and humid climate, and grows well in places with an average annual temperature of 8: 14 ℃ and annual precipitation of 500 mm and 900 mm. Robinia pseudoacacia is not strict with soil and has strong adaptability. Most like deep, fertile, loose, moist silt, sandy loam and loam. Insensitive to soil acidity and alkalinity. It grows poorly on clay and coarse sand where the subsoil is too sticky and hard and poorly drained. Although it has a certain ability to resist drought, it often withered shoots in the severe drought season when there is no rain for a long time. I can't bear to get wet. Afraid of the wind. It grows fast and is an important fast-growing tree species in the world. The root is shallow and the crown is thick. The fruit is early and the yield is abundant. The peak period of volume growth is after 15-20 years, and it can be maintained for more than 40 years under better site conditions. The best choice for afforestation is sandy loam with watering conditions, good drainage and deep and fertile sandy loam. Soak the seeds in hot water before sowing. It is mainly sown in spring, but it can also be sown in rainy season in places where it is particularly dry in spring. Afforestation methods vary from place to place: it is windy in winter and spring, and dry afforestation can be used in autumn or early spring in relatively dry and cold areas; dry afforestation can be carried out in places where the climate is warm and humid but less windy, and afforestation in spring is better. The main pests of Robinia pseudoacacia are termites, leafhoppers, longicorn beetles, scale, small wrinkle moth, locust aphid, Robinia pseudoacacia seed wasp and so on.