梅州市城市森林结构研究

采用样地群落调查法对梅州市6类绿地的组成面积、种群结构、垂直结构、径阶结构和物种重要值进行调查分析，结果表明：（1）现有各类城市森林面积9953．05hm2，其中郊区城市森林绿地面积占总面积的90．69％，其它各类绿地面积合计仅占总面积的9．31％；（2）在65个人工植物群落中，垂直结构为乔、灌、草3层结合的立体群落结构有9个（13．8％），乔、草结合的2层结构类型有34个（52．3％），乔或草单层结构类型共12个（18．5％）；（3）62种乔木树种平均胸径为16．7cm，其中平均胸径〈10cm的有23种（37．1％），平均胸径为10～20cm的树种有29种（46．7％），平均胸径为20～30cm、〉30cm的树种各有5种（分别为8．1％）；（4）梅州市城区乔木层的优势树种是垂榕、大叶榕、大王椰子。

On Structure of Urban Forest in Meizhou City

Based on a sample investigation of the six types of parks, roads, residential, factory, units/campus and suburban forest land in Meizhou city, the area composition, population structure, vertical and diameter structure, importance values of arbor species were analyzed and explored. The results were as follows： （ 1 ） Total area of urban forest were 9953.05hm2, of which area of suburban urban forest were the 90. 69% of total area, and the total area of other types were only 9. 31% of the total area ; （2） Three - layer structure of arbors, shrubs and herbs in the 65 artificial plant communities accounted for 9 （ 13.8% ）, two - layer structure of arbors and herbs accounted for 34 （ 52. 3% ）, andmonolayer structure of arbors or herbs accounted for 12 （ 18. 5% ） in the surveyed 65 artificial plant communities; （3） The average DBH of 62 species of arbors were 16. 7cm, of which the average DBH 〈 10cm had 23 species （37.1%）, the average DBH 10 ~ 20cm had 29 species （46. 7% ）, and of which the average DBH 20 - 30cm or 〉 30cm respectively had 5 species （ respectively 8.1% ） ; （4） The dominant species of arbors layer were Ficus benjamina, F. lacor, Roystonea regia.