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 2022-06-07 Cooperative journals: 《广西植物》
Abstract： The naturalization and invasion of alien species have caused a serious impact on the global environment and social development, and have become a global problem faced by countries in biodiversity management and ecological conservation. China is one of the countries most seriously affected by alien invasion, and the situation is serious in the early warning ， management and governance of alien invasion. Based on field surveys and literature research, Chenopodiastrum murale (L.) S. Fuentes, Uotila & Borsch, an alien invasive plant of Amaranthaceae sensu lato, is first reported for flora of China. C. murale is native to the Mediterranean region and has spread to more than 40 countries in Europe, America, Africa and Oceania. It is an invasive alien plant with great harm, and it is also clearly prohibited by customs and quarantine departments. This exotic invasive plant is now found in Chenggong District, Kunming City, Yunnan Province. This paper describes the morphological characteristics of the species in detail, as well as brief introduction of its taxonomical history, and provides field ecological photos for identification and comparison. In addition, the possible introduction route of C. murale was analyzed, and its potential harm and invasive risks are briefly assessed. This new record clearly demonstrate that the background survey of Chinese alien invasive plants is still insufficient.
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