| 摘要: |
| 为研究典型城市行道树立地环境改造对植物长势及根系的影响, 以广州市南沙区柳园路行道树秋
枫 Bischofia javanica 为研究对象, 采用透气铺装、 绿带种植对其立地环境进行改造。 结果表明, 采了透气铺
装、 绿带种植改造的秋枫地上部分长势得到改善, 其中透气铺装改造对秋枫株高提升较明显, 空白对照组株
高差异最高达 1. 56 m, 绿带种植改造对秋枫胸围提升较明显, 和空白对照组差异最高达 6. 02 cm, 绿带种植
改造对东西冠幅、 南北冠幅提升效果均优于透气铺装改造, 和空白对照差异最高达 5. 33, 5. 14 m。 在垂直方
向上, 透气铺装、 绿带种植改造后秋枫的根系密度随着土壤深度的增加而增加, 透气铺装改造在 0~20 cm 和
>41 cm 的土层深度中对秋枫根系密度影响较大, 在 20~41 cm 土层深度中对秋枫根系密度影响较弱, 而绿带
种植在各个深度中对秋枫根系密度均有提升。 在水平方向上, 不同立地环境改造方式根系密度分布也不同,
其中透气铺装改造秋分根系密度随着扫描半径的增大呈现 “W” 形态的趋势, 根系集中分布在距离主干 1. 0,
2. 0 m 处。 绿带种植改造秋枫根系密度随着扫描半径的增大呈降低趋势, 其中在距离主干 0. 5 m 处根系密度
最大为 8. 53 N/ m。 经过立地环境改造后, 秋枫行道树根系密度和胸围呈显著正相关; 行道树根系密度和株
高呈正相关, 但不显著; 行道树根系密度和平均冠幅呈显著正相关。 典型城市行道树立地环境改造对秋枫地
上部分、 地下部分长势促进效果明显, 针对城市行道树立地环境差、 根系生长空间不足、 长势衰弱等情况,
可优先采用行道树树穴改造的方法改善植物长势及其根系状况。 |
| 关键词: 行道树 立地环境改造 长势 根系 秋枫 |
| DOI： |
| 分类号: |
| 基金项目:广州市科技计划项目 (202206010058). |
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| A Study on the Impact of Site Environment Renovation of Typical Urban Roadside Trees on Plant Growth and Root Systems |
|
xiaozhenquan1, cuicheng2, liuxin1, xianzhuohui2, liangchunmei2, zhangjuntao2
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1.Guangzhou Nansha Economic and Technological Development Zone Construction and Transportation Bureau;2.Guangzhou Institute of Forestry and Landscape Architecture
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| Abstract: |
| 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 renovation” and “green belt planting renovation”. The results indicated that the above-ground growth of the B. javanica 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 better 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 renovation” 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 renovation” 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 radius, with the maximum root density of 8. 53 N / m at a distance of 0. 5 m from the trunk. After the site environment 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 significant, 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 belowground 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. |
| Key words: street trees site environment renovation plant growth root system Bischofia javanica |
