Tillering Regeneration technique of Robinia pseudoacacia

1. After clearing Robinia pseudoacacia, a large amount of residues and shrubs and weeds accumulated on the trail are obstacles to sprout regeneration, which should be cleaned up in time. The main purpose is to improve the site conditions and sanitary conditions, create favorable environment for young trees to grow, and promote young forests to close as soon as possible.

2. To shorten the cultivation cycle of forest, forest enclosure measures were taken to completely close Robinia pseudoacacia clearcut. Cattle and sheep gnaw on young trees and cause serious damage to locust sprouts. Special personnel shall be appointed to supervise and protect them. Grazing is strictly prohibited. Cutting grass, cutting firewood and artificially damaging trees are strictly prohibited. 2,4-D butyl herbicide shall not be used in woodland and within 200 meters nearby.

3. The suitable conditions on the clear cutting site can promote a large number of adventitious buds and dormant buds of Robinia pseudoacacia. For the first time, the density of seedlings should be large to facilitate the closure as soon as possible. The plant spacing was kept at about 1 meter, and the number of plants preserved per mu was 666.

4. Bud wiping and pruning should be carried out in time in the first year. Bud wiping is a tending measure to promote the growth of young trees and cultivate good shapes. The specific method is to wipe off the tender shoots below 2/3 of the trunk when the tender shoots sprouted on the trunk of the young tree have not yet lignified, so as to prevent the nutrient dispersion, which is beneficial to the growth of the young tree and cultivate the node-free good wood. Pruning begins in the second year. Pruning is a kind of tending measure to cut off dead branches or part of live branches, and it is an important means to regulate the internal nutrition of trees. Timely and proper pruning can promote rapid growth of trunk, cultivate good stem shape, reduce branches, improve wood quality, and reduce pests. Pruning can be carried out during the summer growth period, when young trees grow vigorously and wounds heal easily. Pruning tools can be used sharp pruning scissors, close to the trunk cut flat. The pruning intensity should keep the ratio of crown to trunk 3∶1 when the tree height is below 3 m, 3∶2 when the tree height is 3~6 m, and 2∶1 when the tree height is above 6 m.

5. After thinning, budding and regeneration, Robinia pseudoacacia quickly closed into a forest, crown overlapping, lack of light under the forest, serious obstruction of individual crown expansion, competition for light, water and nutrition, and light transmission tending should be carried out in time. In principle, we should adopt the following measures: keeping sparse, keeping large, and keeping excellent. The tending intensity should not be too large, and it is appropriate to open the crown.

Growth tending is a kind of tending felling aimed at regulating stand density and accelerating diameter growth of Robinia pseudoacacia in a long period before stand reaches mature age and mature forest. It is required that the trees with poor development, bent trunk shape and no breeding prospect must be selected and retained, and those trees with poor development, bent trunk shape and no breeding prospect must be cut down. Cutting intensity can be appropriately increased to promote the growth of Robinia pseudoacacia volume, improve tree quality and increase economic benefits.