关键词: 树木, 景观, 庭院, 低密度住宅区, 广州

Abstract: Many private trees have been planted in the house gardens of a low density residential quarter of Huaqiao Xincun of Guangzhou. The study deals with tree composition, structure, spacial pattern, and tree-habitat relationship. A survey was conducted in five main streets of the area. The 165 house gardens with 1409 trees were studied in detail. Some results were compared with those of a previous local street-tree survey. It is shown in study that:species diversity of trees was surprisingly high and tree composition was made up of 114 species. The ratios of local species and fruit trees in the house agrdens were much greater than those in local street tress. At present, most of trees are in range between 3m and 9m. However, potential high of 21 species is more than 20m. Most of trees were cared for and only 15.5% of trees was found in structural damage. In five streets only 4.2% of house gardens had no tree and more than 80% house gardens had 5 or more trees. The gardens had a relatively high species diversity and 45 species occurred as solitary specimen (one tree per garden). In house gardens with trees, 73% of house gardens had solitary specimen and 67.1% of house gardens had five or more species. Space distribution of trees by streets had a relative congregation pattern. The top 10 species of trees occurred in all survey streets and also had a great street aggregation index. This means that they cover most of the study area. Garden size was in important factor for treen growth. It was a key problem that tree density was too high and niches were limited. Trees and landscape in house gardens of Huaqiao Xncun are good examples for the low density residential quarters in other tropical and subtropical areas.

Key words: tree, landscape, house garden, low density quarter, Guangzhou