A Study on the Impact of Site Environment Renovation of Typical Urban Roadside Trees on Plant Growth and Root Systems
This study aimed to investigate the impact of the site environment of typical urban roadside trees on plant growth and root systems.The study focused on the Bischofia javanica along Liuyuan Road in Nansha District,Guangzhou.The site environment of the roadside trees was renovated using"breathable pavement reno-vation"and"green belt planting renovation".The results indicated that the above-ground growth of the B.ja-vanica improved with the"breathable pavement renovation",showing the best improvement in tree height,with a maximum difference of 1.56 m compared to the control group.The"green belt planting renovation"had a bet-ter effect on the increase in tree circumference,with a maximum difference of 6.02 cm compared to the control group.The"green belt planting renovation"also had a better effect on the east-west and north-south crown width,outperforming the"breathable pavement renovation"with a maximum difference of 5.33 m and 5.14 m,respectively.In the vertical direction,the root density of the autumn maple trees increased with soil depth after the"breathable pavement"and"green belt planting"renovations.In the horizontal direction,the root density distribution varied between the different site environment renovation methods.The"breathable pavement renova-tion"had a great influence on the root density of B.javanica in the soil depth of 0～20 cm and>41 cm,and had a weak influence on the root density of B.javanicain the soil depth of 20～41 cm.The"green belt planting ren-ovation"increased the root density of B.javanica in each depth.The"breathable pavement renovation"showed a"W"trend in root density distribution,with roots concentrated at distances of 1.0 m and 2.0 m from the trunk.The"green belt planting renovation"resulted in a decreasing trend in root density with increasing scan ra-dius,with the maximum root density of 8.53 N/m at a distance of 0.5 m from the trunk.After the site environ-ment renovation,a significant positive correlation was observed between the root density and tree circumference of the autumn maple trees.The root density showed a positive correlation with tree height but was not signifi-cant,while a significant positive correlation was observed between root density and average crown width.The site environment renovation of typical urban roadside trees significantly promoted the above-ground and below-ground growth of the autumn maple trees.For urban roadside trees showing weakened growth,rescue measures,such as the renovation of tree pits,should be prioritized for tree rejuvenation.
street treessite environment renovationplant growthroot systemBischofia javanica
NETL
NSTL
万方数据
