广州中山纪念堂植物群落结构动态变化

Dynamic Change of Plant Community Structure in Guangzhou Dr.Sun Yat-sen’s Memorial Hall

2020年7月,采用野外实地普查法对广州市中山纪念堂植物群落进行调查,分析了树种组成、径阶结构、树高分布、健康状况等指标,并与1983年的历史数据进行对比分析,研究37年来该园植物群落结构动态变化。结果表明,1983—2020年:1)公园植物种类从26种增加到104种,乡土植物从17种增加到63种;2)乔木密度从17.1株/hm^(2)增加到202.1株/hm^(2),灌木密度从168.7株/hm^(2)增加到687.8株/hm^(2);3)胸径30 cm以下的乔木增长372株,胸径30~80 cm的乔木增长343株;4)幼林树木的占比上升,大树的占比下降,平均树高自13.9 m降至12.8 m;5)群落树木健康状况良好,健康树木数量占比超过98%。

By comprehensive field survey,this study investigated the plant communities in Guangzhou Dr.Sun Yat-sen’s Memorial Hall in July 2020.Some indexes such as tree species composition,diameter class,tree height distribution,tree health status were analyzed and compared with the plant community data in 1983,to study the dynamic changes of the plant community structure in Guangzhou Dr.Sun Yat-sen's Memorial Hall in the past 37years.The result showed that from 1983 to 2020,firstly,the plant species in this park increased from 26 to 104,and the native plant species increased from 17 to 63.Secondly,the density of trees increased from 17.1 to 202.1 plants per ha,and the density of shrub increased from 168.7 to 687.8 plants per ha.Thirdly,the number of trees with a trunk diameter of less than 30 cm increased by 372,and the number of trees with a trunk diameter of 30 to 80 cm increased by 343.Fourthly,the proportion of young trees increased,while the proportion of large trees decreased,and the average height of trees decreased from 13.9 to 12.8m.Finally,the health status of the trees was good and the proportion of healthy trees was more than 98%.