Subjects: Biology >> Botany >> Applied botany submitted time 2024-05-15 Cooperative journals: 《广西植物》
Abstract： Rock outcrop is a typical feature of karst ecosystem, on which there are complex microhabitats and various colonized plants, but the relationship between these plants and microhabitats is not clear. Taking a tropical seasonal humid forest in Xishuangbanna as the research object in this study, we measured the morphological characteristics and external environmental factors of 586 microhabitats on rock outcrops surface. All colonized vascular species on these microhabitats were identified and counted. Then, Pearson correlation analysis and redundancy analysis (RDA) were used to reveal the relationship between microhabitats (including morphological characteristics and environmental factors) and vascular plants richness. The results were as follows: (1) In tropical karst forest, the microhabitat characteristic such as soil depth [(4.92±4.00)] cm and area [(532.28±1 575.10) cm2] have great variability. (2) A total of 1 518 individuals of 90 species belonging to 82 genera and 44 families were recorded in all microhabitats, and karst preferent species that dominants on limestone accounted for 35.6%. (3) The area size and soil depth of microhabitat can explain more than 70% of species composition and colonized plants richness in RDA model. (4) The species-area relationship between the richness of the colonized plants and the area of rock outcrops microhabitats shows an obvious exponential decay. In conclusion, microhabitats on rock outcrops in the tropical karst forest is highly heterogeneous, the area size and soil depth are the key factors affecting plant colonization, and the species-area relationship dominates the species richness pattern on rock outcrops microhabitats.
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