Pterocarya stenoptera has a broad crown, dense branches and leaves, fast growth and strong adaptability. It is often used as a shade tree and street tree in the Jianghuai Valley. Because of the developed root system, it is more resistant to water and humidity, and is often used for waterside greening. In addition, it has certain resistance to toxic gases such as smoke and sulfur dioxide, and is also suitable for factory greening.
Pterocarya stenoptera is a deciduous tree with a height of 30 meters.
The crown is roughly oval.
Branches with flaky pith, bare buds densely covered with brown hairs, and sessile latent buds overlapping below.
Pinnately compound leaves with 9-23 leaflets and winged leaf axes.
Infructescence pendulous, 20 ~ 30 cm long, nut nearly spherical, with 2 oblong or oblong lanceolate fruit wings, 2 ~ 3 cm long, obliquely spreading.
The flowering period is April-May, and the fruit maturity is August-September.
Pterocarya stenoptera likes light, warm and humid climate and is cold-resistant.
Strong moisture resistance, but not resistant to long-term water accumulation.
The requirements for soil are not strict, and it can grow in acidic to slightly alkaline soil, and it grows best in deep, fertile and humid soil.
Pterocarya stenoptera has deep roots, obvious main roots and developed lateral roots.
Generally, the initial growth rate is slow, accelerating in 3-4 years, slowing down after 15-25 years, gradually stopping after 40-50 years, and beginning to decline after 60 years.
It germinates in late March, and then germinates and blooms. After flowering, it is in the growth period from June to July, stops high growth and maturity from August to September, and leaves gradually fall during the growth period.
Pterocarya stenoptera has strong germination ability and strong branching ability. The plastic channel is in the shape of multi-channel trunk with a plastic belt of 2.5 ~ 3 meters.
When young, the dryness is not strong, and the lateral branches often grow too vigorously. When drying, attention should be paid to timely thinning out strong side branches and retaining auxiliary branches, but not too much or too strong to prevent the trunk from bending.
Because of the large number of branches, it is easy to select and keep skeleton branches, as long as the branches are staggered, but the tree control is difficult, and it usually takes 4 ~ 5 years to meet the requirements of plastic belt.
Pruning of Pterocarya stenoptera is not complicated, the key is to master the appropriate pruning time.
Maintenance and pruning 1 ~ 2 times a year, although deciduous trees, but not suitable for pruning in winter or early spring.
If pruned in winter, its dormant buds may germinate prematurely, affecting normal dormancy and leading to dead branches; If pruned in early spring, it will often affect the tree potential due to bleeding.
Therefore, a small number of dead branches are usually pruned after the cold wave in winter, and then when the buds are about to germinate or have germinated from late March to early April, they are pruned formally after the juice flows out, or pruned once after the leaves are unfolded in May.
Because there are many branches, thinning is the main pruning method. Only when some branches wither and need to be preserved can they be cut short at strong buds or replaced at effective branches.
Dormant buds on the trunk are easy to germinate after pruning and should be erased as soon as possible.