【摘要】 采用样方法,于2018年11月至2019年5月期间对处于韶关学院校园外的弃耕农田进行次生演替植物群落调查,以Raunkiaer频度定律来分析植物群落的演替特征.共抽取360个样方,样地面积达到1 440m~2,共鉴定55科160种植物,其中被列为中国外来入侵植物的有24种;演替植物组成以禾本科植物(20种)聚居,其次是菊科(18种),再次是唇形科(10种)、豆科(7种)与莎草科(7种)等.植物群落结构以一年生草本植物(75种,占46.88%)为主,多年生草本(64种,占40.00%)为次,群落开始出现灌木(8种,占5.00%)和乔木(7种,占4.38%),但是植株矮小,演替群落垂直结构分层不明显.演替特征属A级频度的植物种类占86.9%,属于B级有8.8%,C级有1.9%,D级有1.3%,E级有1.3%,5个频度级别的关系为:A> B> C> D=E.说明该样地的次生演替植物群落属于群落演替初期.更多还原

【Abstract】 Between November 2018 and May 2019,the secondary succession plant community structure on abandoned farmland outside Shaoguan University was investigated by sampling method. And the law of frequency was used to analyze the succession characteristics of the community. A total of 360 samples were selected to reach an area of 1 440 m~2. 160 species in 55 families were identified. There are 24 invasions of alien species. The most successional plants are Gramineae(20 species),Asteraceae(18 species),Labiatae(10 species),Leguminosae(7 species)and Cyperaceae(7 species),etc. The plant community structure is dominated by annual herbs(75 species,accounting for 46.88%)perennial herbs(64 species,40.00%)are secondary,shrubs(8 species,5.00%),and trees(7 species,4.38%)are beginning to appear in the community. Because they are few and short,the vertical structure is not obvious. The plant species with A-frequency of succession characteristics account for86.9%,class B were 8.8%,class C were 1.9%,class D were 1.3%,and class E were 1.3%. There were 5 classes of frequency and with the order of A > B > C > D=E. Survey results show that the plant community belongs to the early stage of community succession.更多还原