Subjects: Biology >> Botany >> Applied botany submitted time 2024-05-15 Cooperative journals: 《广西植物》
Abstract： Based on the 25 ha karst forest big plot in Gulinqing, Yunnan, through sample-plot investigation, specimen collection and identification, floristic analysis, Jaccard similarity coefficient and PCA, we explored its floristic characteristics and the status of the Gulinqing big plot in Yunnnan and the geographical relationships among Gulinqing in Yunnan, Bubeng in Yunnan, and Nonggang in Guangxi, China. The results were as follows: (1) There were about 78 families, 238 genera, and 406 species（including infraspecies taxa and excluding woody vines）of woody plants with DBH≥ 1cm. (2) In the plot, the families with two–five species and with one species were dominant and accounted for 37.18% and 34.62% of the total number of families, respectively, while the genera with two–four species and with one species were also dominant and accounted for 30.25% and 65.13% of the total number of genera, respectively. (3) Through analysis of the areal-types of families and genera, it was found that it had been divided into 9 areal-types and 7 variations at the family level, and the proportion of families was the highest at Pantropic, accounting for 50.77%, and the ratio of tropical flora to temperate flora (R/T) was 4.42; there were 11 areal-types at the genera level, mainly composed of Tropical Asian, Pantropic, Old World Tropics, 33.47%, 18.22%, and 13.98% respectively, and with R/T of the genera was 10.25. (4) The composition of Gulinqing, Bubeng and Nonggang big plots showed that Gulinqing and Bubeng had the highest similarity in family and genera level at Jaccard similarity coefficient (0.674 and 0.395, respectively), and Bubeng and Nonggang with the smallest Jaccard similarity coefficient (0.575 and 0.297, respectively). (5) PCA principal component analysis of the floristic spectrum had similar result of the Jaccard similarity coefficient above in the level of genera, but different one at the level of families, e.g. a higher geographical connection between Gulinqing and Nonggang. In summary, this plot has a high diversity of families and genera, significant tropical characteristics, ancient floristic characteristics, obvious transitional status and extensive flora connections. However, there is an inconsistent geographical connection among Gulinqing, Bubeng and Nonggang from the composition and floristic spectrum.
Subjects: Biology >> Botany >> Applied botany submitted time 2023-12-24 Cooperative journals: 《广西植物》
LUO Yahuang
MA Liangliang
GAO Lianming
WANG Xinjie
ZHAO Wei
YANG Xingliang
MA Shaobin
SHI Xiaochun
LIU Jie
Abstract： A better understanding of the spatiotemporal dynamics of species composition and biodiversity provides significant insights into the distribution patterns of biodiversity and the prediction of biodiversity fate in a global change context. However, how species and phylogenetic diversity change along elevational gradient with temporal scale in mountain ecosystems is largely unknown. In this study, we used census data (2004, 2008 and 2013) of an elevational transect (elevational range 960-2 878 m) covering eastern and western slopes of Gaoligong Mountains, SW China, to investigate the spatiotemporal dynamics of forest arbor layer (DBH≥5 cm) species diversity and phylogenetic diversity. The results were as follows: (1) Species diversity was humpshaped along the elevational gradient, while the phylogenetic diversity increased with increasing elevation. Clustering phylogenetic structure was observed at low elevations, and overdispersed or random structure was detected at high elevations. (2) Overall, temporal species and phylogenetic beta diversity analysis showed no significant difference among these three investigation time points. However, we found a higher clustering of phylogenetic structure along the temporal scale. (3) Spatial beta diversity showed that there was a significant loss of species at low elevations (960-1 381 m) on the eastern slope, where the vegetation has been disturbed or completely converted into farmland. The main lost species including Terminalia chebula, Quercus acutissima,Pistacia weinmanniifolia, Hovenia acerba and Ilex wattii. In contrast, the change in the western slope is mild at low elevations, only observing species abundance increasing, which include Cyclobalanopsis oxyodon, Symplocos chinensis, and Taiwania cryptomerioides. Therefore, we speculate that the change in species and phylogenetic diversity of the arbor layer of subtropical evergreen broadleaf forest may be related to succession process and climatic change in middle and high elevations, while the communities at low elevations were seriously impacted by human activities in the Gaoligong Mountains. The results will deepen the understanding of the mechanisms of plant community dynamics in the Gaoligong Mountains and provide new insights to guide precise conservation strategies in the region.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-05-21 Cooperative journals: 《广西植物》
Abstract： Biodiversity conservation has attracted much attention around the world due to species extinction risks resulting from global climate change, human activities and so on. Traditional attempts to biodiversity conservation typically focus on the analyses of taxonomic composition and its distribution pattern, often ignoring the rich context that evolutionary history can provide. As the intersection area of global biodiversity hotspots, the biodiversity conservation in Yunnan has been widely concerned. To better protect biodiversity in Yunnan, we combine data on the distributions and phylogenetic relationships of species from asterides in Yunnan angiosperms flora, explore how taxonomic composition (including species, endemic species, and threatened species) and phylogenetic diversity vary across the different geographic regions in this area. And then integrating the distribution of nature protected areas with data of taxonomic and phylogenetic composition, we identify the key areas for biodiversity conservation. As expected, phylogenetic diversity was well correlated with taxonomic richness for species, endemic species, and threatened species among the geographic regions. Using null model analyses, we found the standardized effect size of the phylogenetic diversity decreases gradually along the latitude gradient in Yunnan. We suggest that the southern, southeastern, and northwestern Yunnan should be the biodiversity priority areas since they may help maximize the protection of evolutionary history and potential for Yunnan angiosperm flora. Our results show that the integration of phylogenetic information can help us to better understand the formation and development of plant diversity, and provide more clues for biodiversity protection.
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