Effects of pruning intensity on growth, stem shape, flower and leaf of Robinia pseudoacacia woods
In order to cultivate Robinia pseudoacacia forest scientifically and efficiently through pruning, realize comprehensive utilization of R. pseudoacacia forest, taking R. pseudoacacia plantation as the research object, through pruning measures, six pruning intensities were selected for random block test with growth index, stem shape index, flower and leaf morphology and biomass as monitoring indexes, the responses of R. pseudoacacia under different pruning intensities were analyzed and compared. In terms of growth index, the growth of average DBH and average volume of R. pseudoacacia stand grew better, and there was significant difference under 1/2 pruning intensity; pruning had little effect on the average tree height and average crown width; with the increase of pruning intensity, the height under the branch was also increased. From the stem shape index, each pruning intensity had no significant effect on the taper; there was a significant difference in the shape ratio between the control and different pruning intensities ex-cept conventional pruning; the analysis of height diameter ratio showed that the stem shape was slender under 1/2 pruning intensity, while the control was more robust; with the increase of pruning intensity, the height of living crown was decreased gradually. There were significant differences between the control and conventional pruning. In terms of the number and weight of leaves per plant, the highest yield was obtained under 1/3 pruning intensity. From the per-spective of compound leaf morphology of R. pseudoacacia, there was no significant difference in the compound leaf length of R. pseudoacacia under different pruning intensities, but pruning intensity had a significant effect on the compound leaf width and the leaflet length and width of R. pseudoacacia. The number and weight of flowers per plant were the highest in comparison of other organs. For the flower morphology of R. pseudoacacia, different pruning in-tensities had no significant effect on the inflorescence length and width. Under different pruning intensities, the keel petal, wing petal, flag petal and calyx showed different performances in different flowering periods. The response of R. pseudoacacia forest to different pruning intensities was significantly different, which could be cultivated scientifically and efficiently and fully utilized by pruning. For the cultivation of energy forests, the growth index under 1/2 pruning intensity was the best, and the pruned branches could also be burned as fuel carbon. In order to cultivate high-quality building materials that is knot free, plump and straight, 1/2 pruning intensity had the best effect on the growth and stem shape of R. pseudoacacia forest. The biomass and morphological indexes of leaves are very important for the cultivation of forage forests, and 1/3 pruning intensity is the best. The biomass and morphological indexes of flowers are very important for the cultivation of nectar forests, and it is better not to prune.
Robinia pseudoacaciapruninggrowthstem shapeflower and leaf
万方数据
维普
