平潭北香炉屿种子植物区系及功能性状特征

Flora and Functional Traits of Seed Plants in Beixianglu Island,Pingtan

采用样线法和样方法相结合对平潭北香炉屿植物资源进行全面调查,分析种子植物区系地理成分、功能性状特征,并与邻近地域区系进行对比.结果表明:北香炉屿有维管束植物55科109属112种(含原生植物50科94属96种,外来植物12科15属16种),属种系数为97.32%.在科属组成上,优势科为菊科(Compositae)、禾本科(Gramineae),小科和极小科所含的属、种构成是其植物区系的主体成分.在属级地理成分上,都表现出热带成分高于温带成分,以外来植物表现最为突出,与邻近地域相比,R/T高于其他地区.在种子植物功能性状特征上,生长型以草本,生活型以地面芽植物、高位芽植物、1 a生植物占比最大;叶以小型叶、纸质叶、叶有毛、全缘叶、单叶占比最大;果实类型占比前5的是蒴果、瘦果、核果、颖果、浆果;果实大小以微型果、小型果占据优势;在物候特征中,花期和果期持续时长多以中、长为主.

Based on the combined method of line transect and sample method,the plant resources of Beixianglu Island in Pingtan were comprehensively investigated,the floristic geographical components and functional traits of seed plants were analyzed,and compared with the neighboring regional flora.The results showed that there were 112 species of 109 genera in 55 families of vascular plants in Beixiangluyu(including 96 species of 94 genera in 50 families of native plant,and 16 species of 15 genera in 12 families of exotic plant),ratio of genus and species was 97.32%.In terms of family and genus composition,the dominant families are Compositae and Gramineae,and the genus and species of minor families and minor families are the main components of their flora.In terms of genus-level geographical components,tropical components are higher than temperate components,and exotic plants are the most prominent.Compared with different regions,R/T is higher than other regions.In terms of functional traits of seed plants,the growth type is herb,and the life type were phanerophytes,hemicryptophytes and therophytes.The leaf characteristics are microphyll,papery,hairy,leaf margins and leaf leaves with the largest proportion.The top 5 fruit types were capsule,achene,drupe,caryopsis and berry,and the fruit size was dominated by miniature fruit and small fruit.Among the phenological characteritics,the duration of flowering and fruiting periods is mostly medium and long.